[ { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak3", "vnum": "311800", "volcano_name": "Adagdak", "region": "Alaska - Aleutians", "latitude": 51.9905, "longitude": -176.5852, "elevation_meters": 645, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Adagdak", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1190153184_52_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5159 W17635" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak6", "vnum": "311320", "volcano_name": "Akutan", "region": "Alaska - Aleutians", "latitude": 54.13308, "longitude": -165.98555, "elevation_meters": 1303, "boilerplate": "Akutan volcano is a composite stratovolcano located on Akutan Island in the eastern Aleutian Islands. The summit caldera, 2 km diameter, contains an active intracaldera cone. Akutan is one of the most frequently active volcanoes in the Aleutians, and at least 27 eruptions have occurred since 1790. Volcanic activity at Akutan is generally characterized by low-level emission of steam and ash. The last eruption occurred in 1992, and an intense earthquake swarm occurred in March 1996. The community of Akutan is located 14 km (8 miles) east of Akutan volcano.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Akutan", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108076476_60_3.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N5408 W16559" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak8", "vnum": "311390", "volcano_name": "Amak", "region": "Alaska - Alaska Peninsula", "latitude": 55.41728, "longitude": -163.14687, "elevation_meters": 513, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Amak", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1110999023_33_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5525 W16309" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak10", "vnum": "311190", "volcano_name": "Amukta", "region": "Alaska - Aleutians", "latitude": 52.49419, "longitude": -171.25476, "elevation_meters": 1066, "boilerplate": " ", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Amukta", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109360692_20_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5230 W17115" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak14", "vnum": "312090", "volcano_name": "Aniakchak", "region": "Alaska - Alaska Peninsula", "latitude": 56.9058, "longitude": -158.209, "elevation_meters": 1341, "boilerplate": "\u003Cp\u003EAniakchak volcano, located in the central portion of the Alaska Peninsula, consists of a stratovolcano edifice with a 6 mile (10 km) diameter summit caldera. The caldera-forming eruption occurred around 3,500 years ago. Post-caldera eruptions have produced lava domes, tuff cones, and larger spatter and scoria cone structures, including Half-Cone and Vent Mountain, all within the caldera. The most recent eruption occurred in 1931 and created a new vent and lava flows on the western caldera floor while spreading ash over much of southwestern Alaska. Aniakchak volcano is 16 miles (26 km) southeast of the nearest community, Port Heiden, and 416 miles (670 km) southwest of Anchorage, Alaska. It is located in Aniakchak National Monument and Preserve.\u003C\/p\u003E", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Aniakchak.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107911996_45_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5654 W15813" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak17", "vnum": "311160", "volcano_name": "Atka volcanic complex", "region": "Alaska - Aleutians", "latitude": 52.3309, "longitude": -174.139, "elevation_meters": 1533, "boilerplate": "The Atka volcanic complex forms the northern part of Atka Island, located about 16 km north of the community of Atka and 1,761 km southwest of Anchorage. The Atka volcanic complex includes a possible older caldera and several younger vents, including Korovin Volcano, Mount Kliuchef, and Sarichef Volcano. Korovin Volcano, a 1553-m-high (5030 ft) stratovolcano, has been the site of most historical volcanic activity, and has a small, roiling crater lake that occasionally produces energetic steam emissions. Korovin has erupted several times in the past 200 years, including 1973, 1987, and 1998, and has likely had small ash emissions as recently as 2005. Typical recent Korovin eruptions produce minor amounts of ash and occasional but small lava flows. Reports of the height of the ash plume produced by the 1998 eruption ranged as high as 10,600 m (35,000 feet) above sea level. Mount Kliuchef is composed of a series of five vents aligned northeast\u2013southwest. The two main summit vents of Kliuchef appear relatively young and the easternmost was probably the source of an 1812 eruption that is sometimes attributed to Sarichef. ", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Atka", "volcano_image_url": "", "nvews_threat": "High Threat", "icao_coordinates": "N5220 W17408" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak20", "vnum": "313010", "volcano_name": "Augustine", "region": "Alaska - Cook Inlet-South Central", "latitude": 59.3626, "longitude": -153.435, "elevation_meters": 1260, "boilerplate": "Augustine Volcano is a 1260 m high (4134 ft) conical-shaped island stratovolcano located in southern Cook Inlet, about 290 km (180 mi) southwest of Anchorage, Alaska and 120 km (75 mi) southwest of Homer, Alaska. Historically, Augustine is the most active volcano in the Cook Inlet region with significant eruptions in 1812, 1883, 1908, 1935, 1963-64, 1976, 1986, and 2006. These eruptions were primarily explosive events that produced volcanic ash clouds (to 30,000-40,000 feet above sea level), ash fall, pyroclasic flows, and and lava domes or flows. During the 1883 eruption, a large avalanche on the north flank of the volcano flowed into Cook Inlet and may have initiated a tsunami observed at Nanwalek, about 90 km to the east.", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Augustine.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107823039_1_3.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N5922 W15326" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak22", "vnum": "315070", "volcano_name": "Behm Canal-Rudyerd Bay", "region": "Alaska - Southeast Alaska", "latitude": 55.3196, "longitude": -131.051, "elevation_meters": 500, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Behm Canal-Rudyerd Bay", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108153018_8_2.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N5519 W13103" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak25", "vnum": "312080", "volcano_name": "Black Peak", "region": "Alaska - Alaska Peninsula", "latitude": 56.5512, "longitude": -158.787, "elevation_meters": 1032, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Black Peak", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1123890123_38_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5633 W15847" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak28", "vnum": "311100", "volcano_name": "Bobrof", "region": "Alaska - Aleutians", "latitude": 51.9072, "longitude": -177.4409, "elevation_meters": 738, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Bobrof", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1161976754_50_3.JPG", "nvews_threat": "Low Threat", "icao_coordinates": "N5154 W17726" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak29", "vnum": "311300", "volcano_name": "Bogoslof", "region": "Alaska - Aleutians", "latitude": 53.9272, "longitude": -168.0344, "elevation_meters": 150, "boilerplate": "\u003Cp\u003EAt least nine historical eruptions have been documented at Bogoslof volcano. The most recent occurred from December 2016 to August 2017 and produced seventy main explosive events that generated volcanic ash clouds that rose as high as 42,500 ft (13 km) above sea level, and greatly modified the topography of Bogoslof Island.  Previous eruptions of the volcano have lasted weeks to months, and have on occasion produced ash fall on the community of Unalaska. Eruptions of the volcano are often characterized by multiple explosive, ash-producing events as well as the growth of lava domes.\u003C\/p\u003E\u003Cp\u003EBogoslof Island is the largest of a cluster of small, low-lying islands making up the summit of a large submarine stratovolcano. The highest point above sea level is about 490 ft (150 m); however, the volcano is frequently altered by both eruptions and wave erosion and has undergone dramatic changes in historical time. The two main islands currently above sea level are Fire Island and Bogoslof Island, both located about 61 miles (98 km) northwest of Unalaska\/Dutch Harbor, 76 miles (123 km) northeast of Nikolski, and 93 miles (149 km) northeast of Akutan. The volcano is situated slightly north (behind) the main Aleutian volcanic front. Bogoslof volcano is within the U.S. Fish and Wildlife Service Alaska Maritime National Wildlife Refuge and is habitat for marine mammals and seabirds (https:\/\/www.fws.gov\/refuge\/alaska_maritime\/).\u003C\/p\u003E", "volcano_url": "https:\/\/www.avo.alaska.edu\/activity\/Bogoslof.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108076833_27_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5356 W16802" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak34", "vnum": "311010", "volcano_name": "Buldir", "region": "Alaska - Aleutians", "latitude": 52.3488, "longitude": 175.909, "elevation_meters": 656, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Buldir", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1125340112_48_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5221 E17555" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak35", "vnum": "315001", "volcano_name": "Buzzard Creek", "region": "Alaska - Interior Alaska", "latitude": 64.061082, "longitude": -148.431932, "elevation_meters": 830, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Buzzard Creek", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1105555604_90_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N6404 W14826" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak40", "vnum": "311230", "volcano_name": "Carlisle", "region": "Alaska - Aleutians", "latitude": 52.8906, "longitude": -170.0576, "elevation_meters": 1620, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Carlisle", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1117135575_22_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5253 W17003" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak46", "vnum": "311200", "volcano_name": "Chagulak", "region": "Alaska - Aleutians", "latitude": 52.5714, "longitude": -171.1395, "elevation_meters": 1142, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Chagulak", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1218579130_ak46.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5234 W17108" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak49", "vnum": "312110", "volcano_name": "Chiginagak", "region": "Alaska - Alaska Peninsula", "latitude": 57.13348, "longitude": -156.99147, "elevation_meters": 2135, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Chiginagak", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107911737_39_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5708 W15659" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak52", "vnum": "311240", "volcano_name": "Cleveland", "region": "Alaska - Aleutians", "latitude": 52.8222, "longitude": -169.945, "elevation_meters": 1730, "boilerplate": "Cleveland volcano forms the western portion of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. The volcano is located about 45 miles (75 km) west of the community of Nikolski, and 940 miles (1500 km) southwest of Anchorage. The most recent significant period of eruption began in February 2001 and produced 3 explosive events that generated ash clouds as high as 39,000 ft (11.8 km) above sea level. The 2001 eruption also produced a lava flow and hot avalanche that reached the sea. Since then, Cleveland has been intermittently active producing small lava flows, often followed by explosions that generate small ash clouds generally below 20,000 ft (6 km) above sea level. These explosions also launch debris onto the slopes of the cone producing hot pyroclastic avalanches and lahars that sometimes reach the coastline.", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Cleveland.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108080300_57_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5249 W16957" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak72", "vnum": "312050", "volcano_name": "Dana", "region": "Alaska - Alaska Peninsula", "latitude": 55.64205, "longitude": -161.21551, "elevation_meters": 1354, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Dana", "volcano_image_url": "", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5539 W16113" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak73", "vnum": "311040", "volcano_name": "Davidof", "region": "Alaska - Aleutians", "latitude": 51.9542, "longitude": 178.326, "elevation_meters": 328, "boilerplate": "Davidof volcano is a mostly submerged stratovolcano in the Rat Islands group in the western Aleutian Islands, about 215 mi (346 km) west of Adak. The subaerial part of the volcano comprises Davidof, Khvostof, Pyramid, and Lopy islands, which encircle Crater Bay, a 2.5 km diameter caldera. The islands are built up from interbedded lava flows and explosive deposits. The volcano has been sparsely studied, but visits by Alaska Volcano Observatory geologists in 2021 documented thick sequences of rhyolite to dacite pyroclastic flow and fall deposits that represent the most recent explosive eruptions. The age of these deposits is unknown, but they appear older than Holocene deposits from nearby Segula and Little Sitkin. There are no known historical eruptions from Davidof.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Davidof", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1361583314.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5157 E17820" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak74", "vnum": "312210", "volcano_name": "Denison", "region": "Alaska - Alaska Peninsula", "latitude": 58.4173, "longitude": -154.451, "elevation_meters": 2318, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Denison", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1231461096_ak80.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5825 W15427" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak80", "vnum": "312270", "volcano_name": "Douglas", "region": "Alaska - Alaska Peninsula", "latitude": 58.8596, "longitude": -153.5351, "elevation_meters": 2140, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Douglas", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107819572_81_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5852 W15332" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak82", "vnum": "315050", "volcano_name": "Duncan Canal", "region": "Alaska - Southeast Alaska", "latitude": 56.4996, "longitude": -133.102, "elevation_meters": 15, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Duncan Canal", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N5630 W13306" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak83", "vnum": "312011", "volcano_name": "Dutton", "region": "Alaska - Alaska Peninsula", "latitude": 55.1867, "longitude": -162.2744, "elevation_meters": 1473, "boilerplate": "Mount Dutton is located near the tip of the Alaska Peninsula and lies jointly within the Izembek Wilderness Area and the Alaska Peninsula Wildlife Refuge. Dutton is a snow- and ice-covered stratovlocano which rises to an elevation of 4833 feet. Although it has no historic eruptive activity, intense earthquake swarms occurred at the volcano in 1984 and 1988. Dutton is located 14 km (9 miles) north of King Cove and 30 km (19 miles) east of Cold Bay.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Dutton", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108075366_62_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5511 W16216" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak90", "vnum": "315040", "volcano_name": "Edgecumbe", "region": "Alaska - Southeast Alaska", "latitude": 57.0509, "longitude": -135.7611, "elevation_meters": 976, "boilerplate": "Mount Edgecumbe is a 976 m (3202 ft) high stratovolcano on Kruzof Island located 24 km (15 mi) west of Sitka, Alaska, and is part of a broader volcanic field of lava domes and craters on southern Kruzof Island and surrounding submarine vicinity. There are no written observations of eruptions from the volcanic field; Tlingit oral history describes small eruptions from about 800 years ago. Geologic investigations show that eruptions 13,000 to 14,500 years ago produced at least one widespread regional tephra layer around 1 m thick near Sitka and over 30 m thick on parts of Kruzof Island. Smaller eruptions occurred between 6,000 and 4,000 years ago. The volcanic field has erupted a wide range of basalt to rhyolite compositions from numerous vents over the past 600,000 years. The primary hazards of past eruptions, and thus likely in future eruptions, have been volcanic ash emissions producing local and region ashfall and drifting ash clouds. Volcanic lahars (debris flow or sediment-rich debris flows), pyroclastic flows (hot rock avalanches), and lava flows have also occurred on the flanks of Mount Edgecumbe. Mount Edgecumbe and the surrounding volcanic field lies within the Tongass National Forest.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Edgecumbe", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1104263330_7_3.JPG", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5703 W13546" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak93", "vnum": "312020", "volcano_name": "Emmons Lake volcanic center", "region": "Alaska - Alaska Peninsula", "latitude": 55.3409, "longitude": -162.0726, "elevation_meters": 1465, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Emmons Lake Volcanic Center", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108075225_63_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5520 W16204" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak95", "vnum": "314010", "volcano_name": "Espenberg", "region": "Alaska - Seward Peninsula", "latitude": 66.3493, "longitude": -164.333, "elevation_meters": 243, "boilerplate": "CEC - in process: Espenberg maars and basalt field are located on the northern side of the Seward Peninsula. Espenberg is composed of a 850 square kilometer basalt field,containing five maars and five small (\u003E250 m) shield-shaped cinder cones. These cones range in age from \u003E120,000 -~7,000 years old. Espenberg is located 900 km (562 mi) northwest of Anchorage, and has not had any historical activity.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Espenberg", "volcano_image_url": "", "nvews_threat": "", "icao_coordinates": "N6621 W16420" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak100", "vnum": "311350", "volcano_name": "Fisher", "region": "Alaska - Aleutians", "latitude": 54.6692, "longitude": -164.3524, "elevation_meters": 1112, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Fisher", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108075695_29_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5440 W16421" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak103", "vnum": "312260", "volcano_name": "Fourpeaked", "region": "Alaska - Alaska Peninsula", "latitude": 58.7703, "longitude": -153.6738, "elevation_meters": 2104, "boilerplate": "Fourpeaked volcano lies within the northeast corner of Katmai National Park and Preserve on the Alaska Peninsula, 7.5 miles (12 km) southwest of Mount Douglas. It is a stratovolcano that is mostly covered by Fourpeaked Glacier. Small isolated volcanic exposures along ridge crests and cliff faces radiate out from the ice-covered summit. The last major eruption at Fourpeaked was probably more than 10,000 years ago. If there have been eruptions within the last 10,000 years, they were small enough that they did not leave recognizable deposits. There is no record of eruptions within the past few hundred years. Local residents report that steaming similar to the current activity may have occurred several decades ago.", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Fourpeaked.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107820940_44_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5846 W15340" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak105", "vnum": "312010", "volcano_name": "Frosty", "region": "Alaska - Alaska Peninsula", "latitude": 55.0673, "longitude": -162.8354, "elevation_meters": 1920, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Frosty", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108075438_35_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5504 W16250" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak106", "vnum": "311070", "volcano_name": "Gareloi", "region": "Alaska - Aleutians", "latitude": 51.7892, "longitude": -178.796, "elevation_meters": 1573, "boilerplate": "Mount Gareloi, which makes up all of Gareloi Island, is a stratovolcano located in the Delarof Islands group of the Aleutian Islands, about 2,000 km (1,242 mi) west-southwest of Anchorage and about 150 km (93 mi) west of Adak, the westernmost community in Alaska. This small volcano is 10 \u00d7 8 km (6.2 \u00d7 5.0 mi) in diameter at its base with two summits, separated by a narrow saddle. The northern, slightly higher peak contains crater about 300 m (1,000 ft) across. The southern summit has a crater open to the south and a persistent degassing vent (fumarole) on its western rim. Gareloi has been one of the most active in the Aleutians since the 1740s, with 16 reports of eruptive activity at Gareloi since 1760. In 1929, its largest historical eruption produced sixteen small south- to southeast-trending craters that extend from the southern summit to the coast, as well as lava flows and pyroclastic deposits on the southeastern flank of the volcano. Eruptions of Gareloi commonly produce ash clouds and lava flows, and the primary hazard is airborne clouds of ash that could affect aircraft. Since seismic instruments were installed in 2003, they have detected small but consistent seismic signals from beneath Mount Gareloi\u2019s edifice.", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Gareloi.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109362225_15_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5147 W17848" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak109", "vnum": "315021", "volcano_name": "Gordon", "region": "Alaska - Wrangell Volcanic Field", "latitude": 62.1312, "longitude": -143.0883, "elevation_meters": 2755, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Gordon", "volcano_image_url": "", "nvews_threat": "Very Low Threat", "icao_coordinates": "N6208 W14305" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak111", "vnum": "311120", "volcano_name": "Great Sitkin", "region": "Alaska - Aleutians", "latitude": 52.0765, "longitude": -176.1109, "elevation_meters": 1740, "boilerplate": "\u003Ca href=\u0022https:\/\/avo.alaska.edu\/volcano\/great-sitkin\u0022\u003EGreat Sitkin Volcano\u003C\/a\u003E is a basaltic andesite volcano that occupies most of the northern half of Great Sitkin Island, a member of the Andreanof Islands group in the central Aleutian Islands. It is located 26 miles (42 km) east of the community of Adak. The volcano is a composite structure consisting of an older dissected volcano and a younger parasitic cone with a ~1 mile (1.6 km)-diameter summit crater. A steep-sided lava dome, emplaced in the crater during an eruption in 1974, has been mostly buried by the ongoing eruption. The 1974 eruption produced at least one ash cloud that likely exceeded an altitude of 25,000 ft (7.6 km) above sea level. A poorly documented eruption also occurred in 1945, producing a lava dome that was partially destroyed in the 1974 eruption. Within the past 280 years a large explosive eruption produced pyroclastic flows that partially filled the Glacier Creek valley on the southwest flank.", "volcano_url": "https:\/\/www.avo.alaska.edu\/activity\/GreatSitkin.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1102983616_16_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5205 W17607" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak112", "vnum": "312190", "volcano_name": "Griggs", "region": "Alaska - Alaska Peninsula", "latitude": 58.3572, "longitude": -155.1037, "elevation_meters": 2317, "boilerplate": "Griggs is one of the Katmai group of volcanoes located within the Katmai National Park on the Alaska Peninsula. Griggs is a stratovolcano which rises to an elevation of 7600 feet above sea level. There has been no historic activity at the volcano; however, steam emission is common near the summit. Griggs is located 148 km (92 miles) southeast of King Salmon and 440 km (273 miles) southwest of Anchorage.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Griggs", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107885237_41_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5821 W15506" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak116", "vnum": "313050", "volcano_name": "Hayes", "region": "Alaska - Cook Inlet-South Central", "latitude": 61.5991, "longitude": -152.4182, "elevation_meters": 2788, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Hayes", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1206744859_.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N6136 W15225" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak117", "vnum": "311220", "volcano_name": "Herbert", "region": "Alaska - Aleutians", "latitude": 52.741, "longitude": -170.113, "elevation_meters": 1290, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Herbert", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109361813_56_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5244 W17007" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak124", "vnum": "313020", "volcano_name": "Iliamna", "region": "Alaska - Cook Inlet-South Central", "latitude": 60.0319, "longitude": -153.0918, "elevation_meters": 3053, "boilerplate": "Iliamna volcano is located on the western side of lower Cook Inlet in the Lake Clark National Park. Iliamna is a snow-covered stratovolcano which rises 10,020 feet above sea level. Although steam plumes occur on its eastern flanks, there has been no historic volcanic activity at Iliamna. Iliamna is located 225 km (140 miles) southwest of Anchorage and 113 km (70 miles) southwest of Homer.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Iliamna", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107822698_2_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N6002 W15306" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak125", "vnum": "314060", "volcano_name": "Imuruk Lake", "region": "Alaska - Seward Peninsula", "latitude": 65.6, "longitude": -163.92, "elevation_meters": 610, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Imuruk Lake", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1115835244_84_3.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N6536 W16355" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak127", "vnum": "314030", "volcano_name": "Ingakslugwat Hills", "region": "Alaska - Southwest Alaska", "latitude": 61.43, "longitude": -164.47, "elevation_meters": 190, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Ingakslugwat Hills", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N6126 W16428" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak135", "vnum": "311370", "volcano_name": "Isanotski", "region": "Alaska - Aleutians", "latitude": 54.76799, "longitude": -163.72904, "elevation_meters": 2470, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Isanotski", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108075619_31_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5446 W16344" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak136", "vnum": "320090", "volcano_name": "Iskut-Unuk River cones", "region": "Alaska - Southeast Alaska", "latitude": 56.5196, "longitude": -130.331, "elevation_meters": 914, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Iskut-Unuk River cones", "volcano_image_url": "", "nvews_threat": "", "icao_coordinates": "N5631 W13020" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak142", "vnum": "311260", "volcano_name": "Kagamil", "region": "Alaska - Aleutians", "latitude": 52.9726, "longitude": -169.719, "elevation_meters": 893, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Kagamil", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109358464_24_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5258 W16943" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak143", "vnum": "312250", "volcano_name": "Kaguyak", "region": "Alaska - Alaska Peninsula", "latitude": 58.6113, "longitude": -154.0245, "elevation_meters": 901, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Kaguyak", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107820782_80_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5837 W15401" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak144", "vnum": "311110", "volcano_name": "Kanaga", "region": "Alaska - Aleutians", "latitude": 51.9242, "longitude": -177.1623, "elevation_meters": 1307, "boilerplate": "\u003Cp\u003EKanaga Volcano occupies the northern corner of Kanaga Island, one of the most southerly members of the central Aleutian chain. It is a symmetric composite cone 4288 ft (1307 m) high and 3 miles (4.8 km) in diameter at sea level, built of interbedded basaltic and andesitic lava flows, scoria layers, and pyroclastic rocks. Kanaga Volcano’s last significant eruption was in 1994–1995. At least two significant ash plumes were recorded over the course of this eruption: the first, to ~25,000 ft (7.5 km), occurred on February 21, 1995 and the second on August 18, 1995, when an eruption cloud reached ~15,000 ft. (4.5 km). A light dusting of ash fell on the community of Adak and air traffic was disrupted due to continuing low-level activity and cloudy conditions which prevented visual approaches to the Adak air field.\u003C\/p\u003E", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Kanaga", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108080623_47_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5155 W17710" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak146", "vnum": "311130", "volcano_name": "Kasatochi", "region": "Alaska - Aleutians", "latitude": 52.1693, "longitude": -175.5113, "elevation_meters": 314, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Kasatochi.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109361678_53_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5210 W17531" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak147", "vnum": "312170", "volcano_name": "Katmai", "region": "Alaska - Alaska Peninsula", "latitude": 58.279, "longitude": -154.9533, "elevation_meters": 2047, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Katmai", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107821287_75_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5817 W15457" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak151", "vnum": "312120", "volcano_name": "Kialagvik", "region": "Alaska - Alaska Peninsula", "latitude": 57.2019, "longitude": -156.7467, "elevation_meters": 1575, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Kialagvik", "volcano_image_url": "", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5712 W15645" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak161", "vnum": "311020", "volcano_name": "Kiska", "region": "Alaska - Aleutians", "latitude": 52.1031, "longitude": 177.6035, "elevation_meters": 1220, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Kiska", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109362651_10_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5206 E17736" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak168", "vnum": "311140", "volcano_name": "Koniuji", "region": "Alaska - Aleutians", "latitude": 52.2189, "longitude": -175.1323, "elevation_meters": 272, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Koniuji", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1218581667_ak168.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5213 W17508" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak169", "vnum": "314050", "volcano_name": "Kookooligit Mountains", "region": "Alaska - Bering Sea", "latitude": 63.5991, "longitude": -170.433, "elevation_meters": 673, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Kookooligit Mountains", "volcano_image_url": "", "nvews_threat": "Very Low Threat", "icao_coordinates": "N6336 W17026" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak171", "vnum": "311161", "volcano_name": "Korovin", "region": "Alaska - Aleutians", "latitude": 52.38167, "longitude": -174.16527, "elevation_meters": 1533, "boilerplate": "Korovin Volcano is a 1553-m-high (5030 ft) stratovolcano located on the northern part of Atka Island in the central Aleutian Islands, about 21 km (13 mi) north of the community of Atka, 538 km (350 mi) west of Dutch Harbor, and 1760 km (1100 mi) southwest of Anchorage. The volcano has two distinct summit vents about 0.6 km (2000 ft) apart, that have been the sites of eruptive activity in historical time. The most recently active of the vents maintains a small, roiling, lake that occasionally produces energetic steam emissions. Thermal springs and fumaroles located on and near the volcano indicate an active hydrothermal system. Korovin has erupted several times in the past 200 years, including 1973, 1987, and 1998, and has likely had small ash emissions as recently as 2005. Typical recent Korovin eruptions produce minor amounts of ash and occasional but small lava flows. Reports of the height of the ash plume produced by the 1998 eruption ranged from 4,900 to 10,600 m (16,000 to 35,000 feet) above sea level.", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Korovin.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109187436_54_3.jpg", "nvews_threat": "", "icao_coordinates": "N5223 W17410" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak174", "vnum": "312230", "volcano_name": "Kukak", "region": "Alaska - Alaska Peninsula", "latitude": 58.4528, "longitude": -154.3573, "elevation_meters": 2040, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Kukak", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1231461102_ak80.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5827 W15421" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak175", "vnum": "312060", "volcano_name": "Kupreanof", "region": "Alaska - Alaska Peninsula", "latitude": 56.0126, "longitude": -159.7912, "elevation_meters": 1895, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Kupreanof", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109184989_67_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5601 W15947" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak182", "vnum": "311050", "volcano_name": "Little Sitkin", "region": "Alaska - Aleutians", "latitude": 51.9531, "longitude": 178.5356, "elevation_meters": 1188, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Little Sitkin", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1123699844_207_13.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5157 E17832" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak350", "vnum": "999999", "volcano_name": "Maclaren River volcanic field", "region": "Alaska - Cook Inlet-South Central", "latitude": 63.13692, "longitude": -146.32, "elevation_meters": 1470, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Maclaren%20River%20volcanic%20field", "volcano_image_url": "", "nvews_threat": "Waiting for Threat Level", "icao_coordinates": "N6308 W14619" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak187", "vnum": "312150", "volcano_name": "Mageik", "region": "Alaska - Alaska Peninsula", "latitude": 58.1946, "longitude": -155.2544, "elevation_meters": 2165, "boilerplate": "Mageik is one of the Katmai group of volcanoes located within the Katmai National Park on the Alaska Peninsula. Mageik is an ice-capped stratovolcano which rises to an elevation of 7100 feet above sea level. With the exception of a number of unsubstantiated eruption accounts, historic activity at the volcano has been limited to the persistent emission of steam at the crater. Mageik is located 148 km (92 miles) southeast of King Salmon and 440 km (273 miles) southwest of Anchorage.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Mageik", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107821287_75_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5812 W15515" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak188", "vnum": "311310", "volcano_name": "Makushin", "region": "Alaska - Aleutians", "latitude": 53.8899, "longitude": -166.925, "elevation_meters": 1800, "boilerplate": "Makushin Volcano is located on northern Unalaska Island in the eastern Aleutian Islands. Makushin is a broad, ice-capped stratovolcano that rises to an elevation of 5906 feet (1800 m). The 1.86-mile-diameter (3 km) summit crater is the site of frequent steam and minor ash eruptions. Three large explosive eruptions occurred at Makushin between 6,000-9,000 years ago, depositing volcanic material many meters thick near the volcano, and several centimeters deep in the community of Unalaska and the port of Dutch Harbor, 16 miles (25 km) east of the volcano.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Makushin", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108076673_28_3.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N5353 W16656" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak189", "vnum": "312140", "volcano_name": "Martin", "region": "Alaska - Alaska Peninsula", "latitude": 58.1692, "longitude": -155.3566, "elevation_meters": 1860, "boilerplate": "Mount Martin is a small, young volcano that lies just to the southwest of Mageik volcano in Katmai National Park, approximately 475 km (295 miles) southwest of Anchorage. Martin's summit cone sits at an elevation of roughly 6,100 ft (1860 m), perched atop a high ridge of older rock. A summit crater, approximately 300 m in diameter, is home to a series of vigourous steam jets (fumaroles) that emit sulfur-rich volcanic gases; the crater also contains an ephemeral crater lake. No historical eruptions of Mount Martin are known, but Martin's vigorous fumaroles can send prominent steam plumes as high as 3,000 ft above its summit. In addition to the summit cone is a series of thick lava flows that flowed north and northwest, the oldest of which were emplaced prior to about 6,000 years ago. At least 3 eruptive episodes, each years or decades long, separated by several thousand years to about 1000 years, built Mount Martin over a period of several millennia.", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Martin.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107886420_72_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5810 W15521" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak192", "vnum": "311111", "volcano_name": "Moffett", "region": "Alaska - Aleutians", "latitude": 51.937, "longitude": -176.741, "elevation_meters": 1196, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Moffett", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1190154310_51_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5156 W17644" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak33", "vnum": "315030", "volcano_name": "Mount Churchill", "region": "Alaska - Alaska", "latitude": 61.4187, "longitude": -141.7152, "elevation_meters": 5005, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Churchill, Mt", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/thumb\/1107816056_9_3.jpg", "nvews_threat": "", "icao_coordinates": "N6125 W14143" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak229", "vnum": "311280", "volcano_name": "Mount Recheshnoi", "region": "Alaska - Aleutians", "latitude": 53.1536, "longitude": -168.5382, "elevation_meters": 1984, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Recheshnoi", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108077346_25_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5309 W16832" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak203", "vnum": "312180", "volcano_name": "Novarupta", "region": "Alaska - Alaska Peninsula", "latitude": 58.2654, "longitude": -155.1591, "elevation_meters": 841, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Novarupta", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107821599_75_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5816 W15510" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak204", "vnum": "314020", "volcano_name": "Nunivak Island", "region": "Alaska - Southwest Alaska", "latitude": 60.099, "longitude": -166.496, "elevation_meters": 511, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Nunivak Island", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1296862165_ak204.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N6006 W16630" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak206", "vnum": "311290", "volcano_name": "Okmok", "region": "Alaska - Aleutians", "latitude": 53.397, "longitude": -168.166, "elevation_meters": 1073, "boilerplate": "Okmok volcano is a 6-mile-wide caldera that occupies most of the eastern end of Umnak Island, located 75 miles southwest of Dutch Harbor in the eastern Aleutian Islands. Okmok has had several eruptions in historic time typically consisting of ash emissions occasionally to over 30,000 feet ASL but generally much lower; lava flows crossed the caldera floor in 1945, 1958, and 1986. The last eruption occurred in February 1997 and was characterized by lava flows and intermittent ash emissions.\r\n\r\nThe nearest settlements are Nikolski, population about 35, roughly 45 miles west of the volcano, and a small number of people at the abandoned Fort Glenn military base 10 miles east of the volcano. ", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Okmok.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1106852790_26_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5324 W16810" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak210", "vnum": "312030", "volcano_name": "Pavlof", "region": "Alaska - Alaska Peninsula", "latitude": 55.4173, "longitude": -161.8937, "elevation_meters": 2518, "boilerplate": "\u003Ca href=\u0022https:\/\/avo.alaska.edu\/activity\/Pavlof\u0022\u003EPavlof Volcano\u003C\/a\u003E is a snow- and ice-covered stratovolcano located on the southwestern end of the Alaska Peninsula about (592 miles (953 km) southwest of Anchorage. The volcano is about 4.4 miles (7 km) in diameter and has recently active vents on the north and east sides close to the summit. With over 40 historic eruptions, it is one of the most consistently active volcanoes in the Aleutian arc. Eruptive activity is generally characterized by sporadic Strombolian lava fountaining continuing for a several-month period. Ash plumes as high as 49,000 ft above sea level have been generated by past eruptions of Pavlof, and during the March 2016 eruption, ash plumes as high as 40,000 ft above sea level were generated and the ash was tracked in satellite data as distant as eastern Canada. The nearest community, King Cove, is located 30 miles (48 km) to the southwest of Pavlof.", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Pavlof.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108074702_36_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5525 W16154" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak211", "vnum": "312040", "volcano_name": "Pavlof Sister", "region": "Alaska - Alaska Peninsula", "latitude": 55.4569, "longitude": -161.8544, "elevation_meters": 2142, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Pavlof Sister", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108074835_36_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5527 W16151" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak231", "vnum": "313030", "volcano_name": "Redoubt", "region": "Alaska - Cook Inlet-South Central", "latitude": 60.4852, "longitude": -152.7438, "elevation_meters": 3108, "boilerplate": "Heavily ice-mantled Redoubt Volcano is located on the western side of Cook Inlet, 170 km (106 mi) southwest of Anchorage and 82 km (51 mi) west of Kenai, within Lake Clark National Park. Redoubt is a stratovolcano which rises to 10,197 feet above sea level. Recent eruptions occurred in 1902, 1966-68, 1989-90, and 2009. The 1989-90 and 2009 eruptions produced mudflows, or lahars, that traveled down the Drift River and partially flooded the Drift River Oil Terminal facility. The ash plumes produced by the 1989-90 and 2009 eruptions significantly disrupted air traffic and resulted in minor or trace amounts of ash in the city of Anchorage and other communities in south-central and interior Alaska.\r\n", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Redoubt.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107819292_3_3.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N6029 W15245" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak236", "vnum": "311380", "volcano_name": "Roundtop", "region": "Alaska - Aleutians", "latitude": 54.7992, "longitude": -163.5914, "elevation_meters": 1871, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Roundtop", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108075619_31_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5448 W16335" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak242", "vnum": "315010", "volcano_name": "Sanford", "region": "Alaska - Wrangell Volcanic Field", "latitude": 62.2133, "longitude": -144.1295, "elevation_meters": 4949, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Sanford", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107815249_91_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N6213 W14408" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak246", "vnum": "311180", "volcano_name": "Seguam", "region": "Alaska - Aleutians", "latitude": 52.316, "longitude": -172.51, "elevation_meters": 1054, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Seguam", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108080487_19_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5219 W17231" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak247", "vnum": "311030", "volcano_name": "Segula", "region": "Alaska - Aleutians", "latitude": 52.0138, "longitude": 178.134, "elevation_meters": 1153, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Segula", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1125341151_11_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5201 E17808" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak248", "vnum": "311060", "volcano_name": "Semisopochnoi", "region": "Alaska - Aleutians", "latitude": 51.9288, "longitude": 179.5977, "elevation_meters": 800, "boilerplate": "\u003Cp\u003ESemisopochnoi volcano occupies the largest, young volcanic island in the western Aleutians. The volcano is dominated by a 5-mile (8 km) diameter caldera that contains a small lake and several post-caldera cones and craters. The age of the caldera is not known with certainty but is likely early Holocene. Prior to 2018, the previous known historical eruption of Semisopochnoi occurred in 1987, probably from Sugarloaf Peak on the south coast of the island, but details are lacking. Another prominent, young post-caldera landform is Mount Young, a three-peaked cone cluster in the southwest part of the caldera. Mount Young has been intermittently active since 2018. The island is uninhabited and part of the Alaska Maritime National Wildlife Refuge. It is located 40 mi (65 km) northeast of Amchitka Island and 130 mi (200 km) west of Adak.\u003C\/p\u003E", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Semisopochnoi.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1123699844_207_13.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5156 E17936" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak249", "vnum": "311150", "volcano_name": "Sergief", "region": "Alaska - Aleutians", "latitude": 52.0533, "longitude": -174.9521, "elevation_meters": 560, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Sergief", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N5203 W17457" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak252", "vnum": "311360", "volcano_name": "Shishaldin", "region": "Alaska - Aleutians", "latitude": 54.7554, "longitude": -163.9711, "elevation_meters": 2857, "boilerplate": "a href=\u0022https:\/\/avo.alaska.edu\/volcano\/shishaldin\u0022\u003EShishaldin Volcano\u003C\/a\u003E, located near the center of Unimak Island in the eastern Aleutian Islands, is a conical stratovolcano with a base diameter of approximately 10 miles (16 km). It is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 28 confirmed eruptions since 1824. Most eruptions are relatively small, although activity during the 1999 and 2023 eruptions generated ash columns that reached up to 46,000 ft (16 km) above sea level.", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Shishaldin.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108075524_30_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5445 W16358" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak257", "vnum": "312200", "volcano_name": "Snowy Mountain", "region": "Alaska - Alaska Peninsula", "latitude": 58.3336, "longitude": -154.6859, "elevation_meters": 2161, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Snowy", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1231461099_ak80.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5820 W15441" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak260", "vnum": "313040", "volcano_name": "Spurr", "region": "Alaska - Cook Inlet-South Central", "latitude": 61.2989, "longitude": -152.2539, "elevation_meters": 3374, "boilerplate": "Mount Spurr volcano is an ice- and snow-covered stratovolcano located on the west side of Cook Inlet approximately 80 miles (129 km)  west of Anchorage. The only known historical eruptions occurred in 1953 and 1992 from the Crater Peak flank vent located 2 miles (3.5 km) south of the summit of Mount Spurr. These eruptions were brief, explosive, and produced columns of ash that rose up to about 65,000 feet (20 km) above sea level and deposited minor ashfall in south-central Alaska (up to \u00bc inch or 6 mm). The last known eruption from the summit of Mount Spurr was more than 5,000 years ago. In 2004, Mount Spurr experienced an episode of increased seismicity, surface uplift, and heating that melted a large hole in the summit ice cap and generated debris flows. Primary hazards during future eruptions include far-traveled ash clouds, ash fall, pyroclastic flows, and lahars or mudflows that could inundate drainages all sides of the volcano, but primarily on the south and east flanks.", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Spurr.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107816397_82_3.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N6118 W15215" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak262", "vnum": "314040", "volcano_name": "St. Michael", "region": "Alaska - Southwest Alaska", "latitude": 63.4493, "longitude": -162.123, "elevation_meters": 715, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=St. Michael", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N6327 W16207" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak265", "vnum": "312220", "volcano_name": "Steller", "region": "Alaska - Alaska Peninsula", "latitude": 58.4301, "longitude": -154.3903, "elevation_meters": 2272, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Steller", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1231461096_ak80.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5826 W15423" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak304", "vnum": "312051", "volcano_name": "Stepovak Bay group", "region": "Alaska - Alaska Peninsula", "latitude": 55.9125, "longitude": -160.041, "elevation_meters": 1323, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Stepovak Bay 2", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N5555 W16002" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak277", "vnum": "311090", "volcano_name": "Takawangha", "region": "Alaska - Aleutians", "latitude": 51.867, "longitude": -178.027, "elevation_meters": 1449, "boilerplate": "\u003Cp\u003ETakawangha is a remote, 4,754 ft (1,449 m)-high stratovolcano located on the northeast portion of Tanaga Island, roughly 59 miles (95 km) west of Adak in the Andreanof Islands. Takawangha's summit is mostly ice-covered, except for four young craters that have erupted ash and lava flows in the last few thousand years. Parts of Takawangha's edifice are hydrothermally altered and may be unstable, possibly leading to localized debris avalanches from its flanks. Takawangha lies across a saddle from historically active Tanaga volcano to the west. No historical eruptions are known from Takawangha; however, field work shows that recent eruptions have occurred, and it is possible that historic eruptions attributed to Tanaga may instead have come from Takawangha.\u003C\/p\u003E", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Takawangha", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1102969725_46_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5152 W17802" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak280", "vnum": "311080", "volcano_name": "Tanaga", "region": "Alaska - Aleutians", "latitude": 51.884, "longitude": -178.143, "elevation_meters": 1806, "boilerplate": "\u003Cp\u003ETanaga Island lies in the Andreanof Islands approximately 62 miles (100 km) west of the community of Adak and 1260 miles (2025 km) SW of Anchorage. The northern half of the island is home to the Tanaga volcanic complex, comprising three main volcanic edifices. Tanaga Volcano is the tallest of these (5,925 ft or 1,806 m) and lies in the center of the complex. The last reported eruption of Tanaga occurred in 1914 and earlier eruptions were reported in 1763-1770, 1791, and 1829. Reports of these eruptions are vague, but deposits on the flanks of the volcano show that typical eruptions produce blocky lava flows and occasional ash clouds. Eruptions have occurred both from the summit vent and a 5,197 ft (1,584 m)-high satellite vent on the volcano's northeast flank. Immediately west of Tanaga volcano lies Sajaka, a 4,443 ft (1,354 m)-high compound edifice with an older cone to the east that collapsed into the sea within the last few thousand years, and a new cone that has grown in the breach. The new cone is 4,305 ft (1,312 m) high and consists of steeply dipping, interbedded cinders and thin, spatter-fed lava flows. To the east of Tanaga lies Takawangha, which is separated from the other active volcanic vents by a ridge of older rock. No historical eruptions are known from Sajaka or Takawangha; however, field work shows that recent eruptions have occurred, and it is possible that historic eruptions attributed only to Tanaga may instead have come from these other vents.\u003C\/p\u003E", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Tanaga.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1102969725_46_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5153 W17809" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak278", "vnum": "311241", "volcano_name": "Tanax\u0302 Angunax\u0302", "region": "Alaska - Aleutians", "latitude": 52.839, "longitude": -169.758, "elevation_meters": 1170, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Tanax%CC%82%20Angunax%CC%82", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N5250 W16945" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak284", "vnum": "315060", "volcano_name": "Tlevak Strait-Suemez Island", "region": "Alaska - Southeast Alaska", "latitude": 55.2496, "longitude": -133.302, "elevation_meters": 50, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Tlevak Strait", "volcano_image_url": "", "nvews_threat": "Very Low Threat", "icao_coordinates": "N5515 W13318" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak288", "vnum": "312160", "volcano_name": "Trident", "region": "Alaska - Alaska Peninsula", "latitude": 58.2343, "longitude": -155.1026, "elevation_meters": 1097, "boilerplate": "\u003Cp\u003ETrident is one of the Katmai group of volcanoes located within Katmai National Park and Preserve on the Alaska Peninsula. Trident consists of a complex of four cones and numerous lava domes, all andesite and dacite in composition, that reach as high as 6,115 ft (1,864 m) above sea level. An eruption beginning in 1953 constructed the newest cone, Southwest Trident, and four lava flows on the flank of the older complex. This eruption continued through 1974 and produced ash (an initial plume rose to 30,000 ft or 9 km above sea level), bombs, and lava at various times. Fumaroles remain active on the summit of Southwest Trident and on the southeast flank of the oldest, central cone. Trident is located 92 miles (148 km) southeast of King Salmon and 273 miles (440 km) southwest of Anchorage.\u003C\/p\u003E", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Trident", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107821287_75_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5814 W15506" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak295", "vnum": "312130", "volcano_name": "Ugashik-Peulik", "region": "Alaska - Alaska Peninsula", "latitude": 57.7503, "longitude": -156.37, "elevation_meters": 1474, "boilerplate": "Mount Peulik, a small stratovolcano about 10 km (6.2 mi) in diameter at the base, is located just south of Becharof Lake on the Alaska Peninsula, approximately 540 km (325 mi) southwest of Anchorage and 115 km (70 mi) south of King Salmon. The volcano partially covers the northern margin of Ugashik caldera, an older circular structure about 5 km (3.1 mi) in diameter. Peulik's summit crater - about 1.5 km (1 mi) in diameter - is breached on the west side. A lava dome occupies the summit crater. This dome, and possibly earlier predecessors, was the source of a thick block-and-ash flow deposit that covers about 40 square km (15 sq. mi.) of the western flank of the volcano. Debris avalanche deposits representing a flank collapse cover an area of 75 square km (29 sq. mi.) northwest of the volcano. Old lava flows from flank eruptions of Peulik extend north from the volcano as far as Becharof Lake.\r\n\r\nThe only known historic eruption of Peulik occurred around 1814. A report of that eruption stated that Peulik's \u0022summit collapsed with a rumble, covering the base with enormous boulders. For about a week after this event, vapor rose from almost the entire surface of the mountain.\u0022 There was also a report of \u0022smoke\u0022 coming from the crater in 1852.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Ugashik-Peulik", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107887844_40_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5745 W15622" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak296", "vnum": "312131", "volcano_name": "Ukinrek Maars", "region": "Alaska - Alaska Peninsula", "latitude": 57.8338, "longitude": -156.5139, "elevation_meters": 91, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Ukinrek Maars", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107886935_70_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5750 W15631" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak297", "vnum": "311250", "volcano_name": "Uliaga", "region": "Alaska - Aleutians", "latitude": 53.065, "longitude": -169.767, "elevation_meters": 888, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Uliaga", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1118792225_24_3.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N5304 W16946" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak298", "vnum": "0", "volcano_name": "Ungulungwak Hill-Ingrichuak Hill", "region": "Alaska - Southwest Alaska", "latitude": 62.1778, "longitude": -164.0936, "elevation_meters": 188, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Ungulungwak Hill-Ingrichuak Hill", "volcano_image_url": "", "nvews_threat": "", "icao_coordinates": "N6211 W16406" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak299", "vnum": "312132", "volcano_name": "Unnamed (near Ukinrek Maars)", "region": "Alaska - Alaska Peninsula", "latitude": 57.869, "longitude": -155.422, "elevation_meters": 300, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Unnamed (near Ukinrek Maars)", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N5752 W15525" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak301", "vnum": "312070", "volcano_name": "Veniaminof", "region": "Alaska - Alaska Peninsula", "latitude": 56.1979, "longitude": -159.3931, "elevation_meters": 2507, "boilerplate": "Mount Veniaminof volcano is an andesitic stratovolcano with an ice-filled 10-km diameter summit caldera located on the Alaska Peninsula, 775 km (480 mi) southwest of Anchorage and 35 km (22 mi) north of Perryville. Veniaminof is one of the largest (~300 cubic km; 77 cubic mi) and most active volcanic centers in the Aleutian Arc and has erupted at least 14 times in the past 200 years. Recent eruptions in 1993-95, 2005, 2013, and 2018 all occurred at the intracaldera cone and lasted for several months. These eruptions produced lava spattering and fountaining, minor emissions of ash and gas, and small lava flows into intracaldera icefield. Minor ash-producing explosions occurred nearly annually between 2002 and 2010. Previous historical eruptions have produced ash plumes that reached 15,000 to 20,000 ft above sea level (1939, 1956, and 2018) and ash fallout that blanketed areas within about 40 km (25 mi) of the volcano (1939, 2018).", "volcano_url": "https:\/\/avo.alaska.edu\/activity\/Veniaminof.php", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1102615671_37_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5612 W15924" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak307", "vnum": "311270", "volcano_name": "Vsevidof", "region": "Alaska - Aleutians", "latitude": 53.1256, "longitude": -168.6937, "elevation_meters": 2149, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Vsevidof", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108077836_58_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5308 W16842" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak322", "vnum": "311340", "volcano_name": "Westdahl", "region": "Alaska - Aleutians", "latitude": 54.5171, "longitude": -164.6476, "elevation_meters": 1560, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Westdahl", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108075903_61_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N5431 W16439" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak324", "vnum": "311315", "volcano_name": "Wide Bay cone", "region": "Alaska - Aleutians", "latitude": 53.9611, "longitude": -166.615, "elevation_meters": 640, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Wide Bay cone", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N5358 W16637" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak326", "vnum": "315020", "volcano_name": "Wrangell", "region": "Alaska - Wrangell Volcanic Field", "latitude": 62.00572, "longitude": -144.01935, "elevation_meters": 4317, "boilerplate": "CEC - in process: Mt. Wrangell is a 4317 m (14,163 ft) high, andesitic, shield volcano with an ice-filled summit caldera, located in the Wrangell-St. Elias National Park and Preserve. Mt. Wrangell has three small post-caldera craters, named North Crater, East Crater, and Mt. Zanetti. These craters are all geothermally active, and there are frequent historical reports of steam from Mt. Wrangell. There are also several questionable reports of historical eruptive activity. Mt. Wrangell is 330 km (206 mi) northeast of Anchorage.", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Wrangell", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107814906_5_3.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N6200 W14401" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak328", "vnum": "312100", "volcano_name": "Yantarni", "region": "Alaska - Alaska Peninsula", "latitude": 57.0179, "longitude": -157.1864, "elevation_meters": 1336, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Yantarni", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107911863_68_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5701 W15711" }, { "obs_abbr": "avo", "obs_fullname": "Alaska Volcano Observatory", "obs_email": "avo-sci@usgs.gov", "volcano_cd": "ak329", "vnum": "311210", "volcano_name": "Yunaska", "region": "Alaska - Aleutians", "latitude": 52.649, "longitude": -170.659, "elevation_meters": 550, "boilerplate": "", "volcano_url": "https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Yunaska", "volcano_image_url": "https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109190747_55_3.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N5239 W17040" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca4", "vnum": "323100", "volcano_name": "Clear Lake Volcanic Field", "region": "California", "latitude": 38.97, "longitude": -122.77, "elevation_meters": 1439, "boilerplate": "strong>Clear Lake Volcanic Field is located about 90 miles north of San Francisco, California. The town of Clear Lake lies within the field, as does the 43,000-acre freshwater lake of its namesake. The most prominent volcanic feature in the field is 350,000-year-old Mount Konocti, rising about 3,200 feet above the south shore of the lake. The 2-million-year history of Clear Lake volcanic field consists of a mixture of explosive and effusive eruptions, including lava domes, lava flows, scoria cones, and explosions resulting from the interaction of magma and groundwater. These explosions are the most recent events in the field, and may have occurred as recently as 8,000 years ago. Clear Lake volcanic field is well known for steam vents and hot springs. The Geysers steam field sits along the southwest margin of the volcanic field, and hosts one of the world\u2019s most productive geothermal power facilities. Currently there are 13 plants in operation generating about 725 megawatts (MW) of electricity.\u003Cbr\u003EAdditional research is needed to determine the likelihood of a future eruption in the Clear Lake volcanic field, but recent geophysical and geochemical surveys suggest that a reservoir of partly molten rock underlies the volcanic field, and another body of magma underlies The Geysers steam field.\u003Cbr\u003E<br>Monitoring in the Clear Lake volcanic region by the USGS, and by a collaborative USGS-Calpine Corporation effort in The Geysers steam field, provides real-time tracking of earthquake activity. Seismicity under the Clear Lake volcanic field is mostly concentrated near the southern arm of the lake and is limited to a few dozen events per year. The geothermal system under The Geysers steam field, in contrast, produces thousands of earthquakes yearly. The USGS periodically analyzes volcanic gas emissions in the region.", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/clear-lake-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/clear_lake\/CLV_thumb.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N3858 W12246" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca5", "vnum": "323180", "volcano_name": "Coso Volcanic Field", "region": "California", "latitude": 36.03, "longitude": -117.82, "elevation_meters": 2400, "boilerplate": "strong>The Coso Volcanic Field is located on the eastern side of the Sierra Nevada mountains at the northern end of the Mojave Desert, about 40 miles north of Ridgecrest, California. The field covers about 150 square miles primarily within the China Lake Naval Air Weapons Station, and is comprised of lava domes, lava flows, and scoria cones erupted over the past 250,000 years. Eruptions were not constant over this time; they clustered in seven distinct periods, the last and most voluminous of which began about 80,000 years ago and persisted for 20,000 years. The 17 youngest rhyolite domes were erupted between ~ 100,000 and 78,000 years ago, while the youngest scoria cone is about 40,000 years old.\u003Cbr\u003E<br>Geophysical and geochemical surveys indicate that a zone of partly molten rock lies below the surface at Coso. Heat emanating from this zone produces sporadic steaming at the surface and fuels a robust geothermal resource managed by the U.S. Navy. The geothermal field currently produces about 300 MW of power from 30 to 40 active wells, and has been continually productive since the mid 1980s. The U.S. Navy currently monitors earthquake and geothermal activity within the Coso volcanic field.", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/coso-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/coso_volcanic_field\/Coso-volcanic-field-310.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N3602 W11749" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca9", "vnum": "323080", "volcano_name": "Lassen Volcanic Center", "region": "California", "latitude": 40.492, "longitude": -121.508, "elevation_meters": 3187, "boilerplate": "strong\u003ELassen Volcanic Center \u003C\/strong\u003Eis part of the Cascade Volcanic Arc, and is located about 55 miles east of Redding, California, in Lassen Volcanic National Park. In the past 825,000 years, hundreds of explosive eruptions came from vents scattered over 200 square miles. The volcanic center has been quiet for the last 25,000 years, with three notable exceptions\u2014the Chaos Crags eruption (1,100 years ago), the Cinder Cone eruption (345 years ago), and the 20th-century eruption of Lassen Peak (1914\u201317). Although considered a relatively \u201csmall\u201d eruption by Cascade standards, the Lassen Peak eruption produced a 3-year-long series of ash-laden steam blasts, punctuated by a larger episode in May 1915 that produced an ash column 30,000 feet high. This explosion was accompanied by devastating pyroclastic flows, lahars, and drifting ash clouds which deposited ash 280 miles to the east. Today, a vigorous hydrothermal system, numerous hot springs, fumaroles, hot ground, and boiling mud pots attest to the youthful and still-active nature of the Lassen Volcanic Center.\u003Cbr\/\u003E<br>Periodic geochemical sampling of gas and water indicates that a deep-seated zone of partly molten rock resides under Lassen Volcanic Center. A volcano monitoring network operated by the USGS (seismometers) and UNAVCO (GPS receivers) reveals occasional episodes of heightened earthquake activity (earthquake swarms) coupled with gradual subsidence of the ground surface owing to motion on regional faults and \u201csagging\u201d of thermally softened rock.\u003Cbr\/\u003E<br>Also noteworthy is the regional volcanic field surrounding the Lassen Volcanic Center, which is made up of more than 55 scattered vents from eruptions occurring 100,000 to 15,000 years ago. Most of these vents are within 10 miles of Lassen Peak and had short-lived eruptions that produced cinder cones, lava flows, and\/or ash deposits within a few miles of the vent.", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/lassen-volcanic-center", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/lassen_volcanic_center\/Lassen82_310.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4030 W12130" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca11", "vnum": "323822", "volcano_name": "Long Valley Caldera", "region": "California", "latitude": 37.7, "longitude": -118.87, "elevation_meters": 2204, "boilerplate": "strong\u003EThe Long Valley volcanic region \u003C\/strong\u003Eis a broad area straddling Highway 395 near the eastern border of Yosemite National Park. Hundreds of eruptions have shaped this picturesque landscape over the last 4 million years, including a cataclysmic eruption about 767,000 years ago that created a 20\u00d710-mile collapsed basin known as Long Valley Caldera. Although the last eruption within Long Valley Caldera was about 100,000 years ago, magmatic heat fuels a robust geothermal system, hot springs, and fumaroles.\u003Cbr\/\u003E<br>Mammoth Mountain, a 100,000 to 50,000-year-old cluster of overlap\u00adping lava domes, sits on the western rim of Long Valley Caldera, partly within the town of Mammoth Lakes. Springs, fumaroles, and diffuse emissions of volcanic gas are common to Mammoth Mountain. Several young cinder cones and lava flows are dispersed around the base of the mountain. The youngest, Red Cones, was created during an eruption that occurred about 8,000 years ago.\u003Cbr\/\u003E<br>The most recent eruptions in the Long Valley volcanic region were not from Long Valley Caldera or Mammoth Mountain, but along a curved chain of volcanic vents extending about 23 miles northward from Mammoth Mountain to Mono Lake. These eruptions produced Mono Craters, which erupted about 680 years ago, and the Mono Lake volcanic field to the north, which was last active about 300 years ago.\u003Cbr\/\u003E<br>Specific threat rankings for the Long Valley volcanic region are: very high for Long Valley Caldera, high for Mono Craters, moderate for Mono Lake volcanic field, and moderate for Mammoth Mountain.\u003Cbr\/\u003E<br>An extensive monitoring network operated by the USGS has documented sporadic unrest under Long Valley Caldera and Mammoth Mountain over the last three decades. Unrest includes periods of heightened seismicity, ground deformation and uplift, changes to the geothermal system, and intense emission of volcanic gas (most notably, carbon dioxide).", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/long-valley-caldera", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/long_valley\/Long_Valley_310.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N3742 W11852" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca12", "vnum": "323150", "volcano_name": "Mammoth Mountain", "region": "California", "latitude": 37.631, "longitude": -119.032, "elevation_meters": 3369, "boilerplate": "strong>The Long Valley volcanic region is a broad area straddling Highway 395 near the eastern border of Yosemite National Park. Hundreds of eruptions have shaped this picturesque landscape over the last 4 million years, including a cataclysmic eruption about 767,000 years ago that created a 20\u00d710-mile collapsed basin known as Long Valley Caldera. Although the last eruption within Long Valley Caldera was about 100,000 years ago, magmatic heat fuels a robust geothermal system, hot springs, and fumaroles.\u003Cbr\u003E<br>Mammoth Mountain, a 100,000 to 50,000-year-old cluster of overlap\u00adping lava domes, sits on the western rim of Long Valley Caldera, partly within the town of Mammoth Lakes. Springs, fumaroles, and diffuse emissions of volcanic gas are common to Mammoth Mountain. Several young cinder cones and lava flows are dispersed around the base of the mountain. The youngest, Red Cones, was created during an eruption that occurred about 8,000 years ago.\u003Cbr\u003E<br>The most recent eruptions in the Long Valley volcanic region were not from Long Valley Caldera or Mammoth Mountain, but along a curved chain of volcanic vents extending about 23 miles northward from Mammoth Mountain to Mono Lake. These eruptions produced Mono Craters, which erupted about 680 years ago, and the Mono Lake volcanic field to the north, which was last active about 300 years ago.\u003Cbr\u003E<br>Specific threat rankings for the Long Valley volcanic region are: very high for Long Valley Caldera, high for Mono Craters, moderate for Mono Lake volcanic field, and moderate for Mammoth Mountain.\u003Cbr\u003E<br>An extensive monitoring network operated by the USGS has documented sporadic unrest under Long Valley Caldera and Mammoth Mountain over the last three decades. Unrest includes periods of heightened seismicity, ground deformation and uplift, changes to the geothermal system, and intense emission of volcanic gas (most notably, carbon dioxide).", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mammoth-mountain", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mammoth_mountain\/Mammoth_Mountain_310.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N3738 W11902" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca13", "vnum": "323020", "volcano_name": "Medicine Lake volcano", "region": "California", "latitude": 41.611, "longitude": -121.554, "elevation_meters": 2412, "boilerplate": "strong>Medicine Lake volcano is a large, broad volcano (\u003Cstrong\u003Eshield volcano\u003C\/strong\u003E) located in northern California, about 50 miles northwest of Alturas, the seat of Modoc County, and about 35 miles south of Klamath Falls, Oregon. Lava Beds National Monument lies on the north side of the volcano. Located at the summit of the volcano is a water-filled collapse basin, or caldera, formed by withdrawal of magma during eruptions. The caldera is 8 miles wide and 14 miles across. The intermittent, mostly effusive (nonexplosive) eruptions over the last half million years produced expansive lava flows, some covering as much as 100 square miles. The volcano has erupted nine times during the past 5,200 years, and seven of those eruptions began with an explosive phase. The two youngest eruptions produced ash clouds that drifted tens of miles downwind before explosions ceased and thick, glassy lava flows (obsidian) began oozing from the vents forming Little Glass Mountain (1,000 years ago) and Glass Mountain (950 years ago).\u003Cbr\u003E<br>USGS seismometers and UNAVCO Global Positioning System (GPS) receivers provide a modest volcano monitoring network at Medicine Lake volcano. Volcanic gas emissions suggest that partly molten rock lies beneath the volcano, which provides heat for a robust geothermal system underlying the caldera. Sporadic earthquake swarms are detected by the monitoring network as well as ground subsidence owing to motions on regional faults and \u201csagging\u201d of rock softened by volcanic heat.", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/medicine-lake", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/medicine_lake\/MLV-farNview_thumb.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N4137 W12133" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca15", "vnum": "323110", "volcano_name": "Mono Lake Volcanic Field", "region": "California", "latitude": 38, "longitude": -119.03, "elevation_meters": 2121, "boilerplate": "strong\u003EThe Long Valley volcanic region \u003C\/strong\u003Eis a broad area straddling Highway 395 near the eastern border of Yosemite National Park. Hundreds of eruptions have shaped this picturesque landscape over the last 4 million years, including a cataclysmic eruption about 767,000 years ago that created a 20\u00d710-mile collapsed basin known as Long Valley Caldera. Although the last eruption within Long Valley Caldera was about 100,000 years ago, magmatic heat fuels a robust geothermal system, hot springs, and fumaroles.\u003Cbr\/\u003E<br>Mammoth Mountain, a 100,000 to 50,000-year-old cluster of overlap\u00adping lava domes, sits on the western rim of Long Valley Caldera, partly within the town of Mammoth Lakes. Springs, fumaroles, and diffuse emissions of volcanic gas are common to Mammoth Mountain. Several young cinder cones and lava flows are dispersed around the base of the mountain. The youngest, Red Cones, was created during an eruption that occurred about 8,000 years ago.\u003Cbr\/\u003E<br>The most recent eruptions in the Long Valley volcanic region were not from Long Valley Caldera or Mammoth Mountain, but along a curved chain of volcanic vents extending about 23 miles northward from Mammoth Mountain to Mono Lake. These eruptions produced Mono Craters, which erupted about 680 years ago, and the Mono Lake volcanic field to the north, which was last active about 300 years ago.\u003Cbr\/\u003E<br>Specific threat rankings for the Long Valley volcanic region are: very high for Long Valley Caldera, high for Mono Craters, moderate for Mono Lake volcanic field, and moderate for Mammoth Mountain.\u003Cbr\/\u003E<br>An extensive monitoring network operated by the USGS has documented sporadic unrest under Long Valley Caldera and Mammoth Mountain over the last three decades. Unrest includes periods of heightened seismicity, ground deformation and uplift, changes to the geothermal system, and intense emission of volcanic gas (most notably, carbon dioxide).", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mono-lake-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mono_lake_volcanic_field\/MLVF-mono-lake.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N3800 W11902" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca21", "vnum": "323120", "volcano_name": "Mono-Inyo Craters", "region": "California", "latitude": 37.82, "longitude": -119.02, "elevation_meters": 2629, "boilerplate": "strong\u003EThe Long Valley volcanic region \u003C\/strong\u003Eis a broad area straddling Highway 395 near the eastern border of Yosemite National Park. Hundreds of eruptions have shaped this picturesque landscape over the last 4 million years, including a cataclysmic eruption about 767,000 years ago that created a 20\u00d710-mile collapsed basin known as Long Valley Caldera. Although the last eruption within Long Valley Caldera was about 100,000 years ago, magmatic heat fuels a robust geothermal system, hot springs, and fumaroles.\u003Cbr\/\u003E<br>Mammoth Mountain, a 100,000 to 50,000-year-old cluster of overlap\u00adping lava domes, sits on the western rim of Long Valley Caldera, partly within the town of Mammoth Lakes. Springs, fumaroles, and diffuse emissions of volcanic gas are common to Mammoth Mountain. Several young cinder cones and lava flows are dispersed around the base of the mountain. The youngest, Red Cones, was created during an eruption that occurred about 8,000 years ago.\u003Cbr\/\u003E<br>The most recent eruptions in the Long Valley volcanic region were not from Long Valley Caldera or Mammoth Mountain, but along a curved chain of volcanic vents extending about 23 miles northward from Mammoth Mountain to Mono Lake. These eruptions produced Mono Craters, which erupted about 680 years ago, and the Mono Lake volcanic field to the north, which was last active about 300 years ago.\u003Cbr\/\u003E<br>Specific threat rankings for the Long Valley volcanic region are: very high for Long Valley Caldera, high for Mono Craters, moderate for Mono Lake volcanic field, and moderate for Mammoth Mountain.\u003Cbr\/\u003E<br>An extensive monitoring network operated by the USGS has documented sporadic unrest under Long Valley Caldera and Mammoth Mountain over the last three decades. Unrest includes periods of heightened seismicity, ground deformation and uplift, changes to the geothermal system, and intense emission of volcanic gas (most notably, carbon dioxide).", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mono-inyo-chain", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mono_inyo_craters\/Mono_craters_310.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N3749 W11901" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca16", "vnum": "323010", "volcano_name": "Mount Shasta", "region": "California", "latitude": 41.409, "longitude": -122.193, "elevation_meters": 4317, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mount-shasta", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mount_shasta\/Mount-Shasta-310.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4125 W12212" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca20", "vnum": "323200", "volcano_name": "Salton Buttes", "region": "California", "latitude": 33.2, "longitude": -115.62, "elevation_meters": -40, "boilerplate": "strong\u003EThe Salton Buttes \u003C\/strong\u003Eare composed of five small lava domes that are perched along the southeast shore of the Salton Sea, about 90 miles southeast of Palm Springs, California, in the agricultural heart of Imperial Valley. At least four of these domes formed between 2,300 and 1,800 years ago, each starting with a short explosive phase that then gave way to an effusive eruption of viscous lava oozing from vents to create glassy mounds of black obsidian. The fifth dome may be somewhat older than the others, with an eruption age of about 5,000 years ago. Although small\u2014all are less than 230 feet high\u2014these domes overlie the 8-square-mile zone of high heat flow and magma influx that created the Salton Sea geothermal resource area, the largest and hottest geothermal system in the continental United States. The geothermal field currently has a combined capacity of about 437 MW of power from 10 generating plants.\u003Cbr\/\u003EA modest seismic network operated by the USGS and the California Institute of Technology (Caltech) detects a persistent pattern of small to moderate earthquakes, most of which are related to the geothermal system and to movement along regional faults. Periodic geochemical sampling from fumaroles, hot springs, and mud pots indicates that gas from an underlying magma reservoir is being released at the surface.", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/salton-buttes", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/salton_buttes\/Salton_Buttes_310.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N3312 W11537" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "nv1", "vnum": "326010", "volcano_name": "Soda Lakes", "region": "Nevada", "latitude": 39.51764, "longitude": -118.880719, "elevation_meters": 1415, "boilerplate": "", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/soda-lakes", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/soda_lakes\/SL-smithsonian_thumb.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N3931 W11853" }, { "obs_abbr": "calvo", "obs_fullname": "California Volcano Observatory", "obs_email": "CaliforniaVolcanoObservatory@usgs.gov", "volcano_cd": "ca19", "vnum": "323160", "volcano_name": "Ubehebe Craters", "region": "California", "latitude": 37.02, "longitude": -117.45, "elevation_meters": 752, "boilerplate": "strong\u003EUbehebe Craters\u003C\/strong\u003E, located about 140 miles northwest of Las Vegas, Nevada, in Death Valley National Park, consists of fourteen overlapping volcanic craters. The largest crater is about a half mile wide and 800 feet deep. The craters formed during a series of explosions about 2,100 years ago that were triggered as magma rising toward the Earth\u2019s surface flashed groundwater to steam. The explosions blasted pulverized rock and lava high into the air, with ballistics and ash blanketing an area of about 15 square miles. Recent research suggests the crater-forming blasts may have taken place over a very short period, perhaps spanning only a few days or weeks from start to finish.\u003Cbr\/\u003EUnlike other young volcanoes in California, no visual evidence suggests magma still resides underneath Ubehebe Craters\u2014 fumaroles, hot springs, or areas of high heat flow are not evident at the surface\u2014but the absence of magma at depth, and assessment of the likelihood of future eruptions, needs confirmation from future geophysical investigations. For now, Ubehebe Craters is classified as a \u201cModerate Threat\u201d volcano because of its youth and past explosivity.", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/ubehebe-craters", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/ubehebe_craters\/UC-blog_thumb.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N3701 W11727" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or1", "vnum": "322060", "volcano_name": "Belknap Crater", "region": "Oregon", "latitude": 44.285, "longitude": -121.841, "elevation_meters": 2095, "boilerplate": " ", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/belknap", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/belknap\/Belknap-home.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N4417 W12150" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or2", "vnum": "322030", "volcano_name": "Blue Lake Crater", "region": "Oregon", "latitude": 44.42, "longitude": -121.77, "elevation_meters": 1230, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/blue-lake-crater", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/blue_lake_crater\/Blue_Lake_Crater_LeeSiebert_081080-home.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N4425 W12146" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or3", "vnum": "322150", "volcano_name": "Cinnamon Butte", "region": "Oregon", "latitude": 43.241, "longitude": -122.108, "elevation_meters": 1956, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/cinnamon-butte", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/cinnamon_butte\/Cinnamon_Butte_LeeSiebert_065040-home.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N4314 W12206" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or4", "vnum": "322160", "volcano_name": "Crater Lake", "region": "Oregon", "latitude": 42.93, "longitude": -122.12, "elevation_meters": 2487, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/crater-lake", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/crater_lake\/crater-lake-home.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4256 W12207" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or5", "vnum": "322100", "volcano_name": "Davis Lake volcanic field", "region": "Oregon", "latitude": 43.57, "longitude": -121.82, "elevation_meters": 2163, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/davis-lake-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/davis_lake\/Davis-Lake-Home.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N4334 W12149" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or6", "vnum": "322120", "volcano_name": "Devils Garden lava field", "region": "Oregon", "latitude": 43.512, "longitude": -120.861, "elevation_meters": 1698, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/devils-garden-lava-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/devils_garden\/Devils-Garden_Google-home.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N4331 W12052" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or7", "vnum": "322170", "volcano_name": "Diamond Craters volcanic field", "region": "Oregon", "latitude": 43.1, "longitude": -118.75, "elevation_meters": 1435, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/diamond-craters-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/diamond_craters\/Diamond-Craters-CCcomplex-home.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N4306 W11845" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "wa3", "vnum": "321020", "volcano_name": "Glacier Peak", "region": "Washington", "latitude": 48.112, "longitude": -121.113, "elevation_meters": 3213, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/glacier-peak", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/glacier_peak\/Glacier-Peak-home.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4807 W12107" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "wa5", "vnum": "321070", "volcano_name": "Indian Heaven Volcanic Field", "region": "Washington", "latitude": 45.93, "longitude": -121.82, "elevation_meters": 1806, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/indian-heaven-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/indian_heaven\/Indian-Heaven_Lemei-Rock_home.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N4556 W12149" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or10", "vnum": "322190", "volcano_name": "Jordan Craters volcanic field", "region": "Oregon", "latitude": 43.15, "longitude": -117.47, "elevation_meters": 1473, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/jordan-craters-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/jordan_craters\/Jordan_Craters_LeeSiebert_102095-home.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N4309 W11728" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "wa1", "vnum": "321040", "volcano_name": "Mount Adams", "region": "Washington", "latitude": 46.206, "longitude": -121.49, "elevation_meters": 3742, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mount-adams", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/adams\/Mount-Adams-home.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N4612 W12129" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or11", "vnum": "322090", "volcano_name": "Mount Bachelor", "region": "Oregon", "latitude": 43.979, "longitude": -121.688, "elevation_meters": 2763, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mount-bachelor", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mount_bachelor\/bachelor-home.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N4359 W12141" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "wa2", "vnum": "321010", "volcano_name": "Mount Baker", "region": "Washington", "latitude": 48.777, "longitude": -121.813, "elevation_meters": 3285, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mount-baker", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/baker\/Mount-Baker-home.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4847 W12149" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or12", "vnum": "322010", "volcano_name": "Mount Hood", "region": "Oregon", "latitude": 45.374, "longitude": -121.695, "elevation_meters": 3426, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mount-hood", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mount_hood\/Mount-Hood-home.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4522 W12142" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or13", "vnum": "322020", "volcano_name": "Mount Jefferson", "region": "Oregon", "latitude": 44.674, "longitude": -121.8, "elevation_meters": 3199, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mount-jefferson", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mount_jefferson\/Mount-Jefferson-home.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N4440 W12148" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "wa6", "vnum": "321030", "volcano_name": "Mount Rainier", "region": "Washington", "latitude": 46.853, "longitude": -121.76, "elevation_meters": 4392, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mount-rainier", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mount_rainier\/Mount-Rainier-home.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4651 W12146" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "wa4", "vnum": "321050", "volcano_name": "Mount St. Helens", "region": "Washington", "latitude": 46.2, "longitude": -122.18, "elevation_meters": 2549, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mount-st-helens", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/st_helens\/Mount-st-Helens-home.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4612 W12211" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or15", "vnum": "322110", "volcano_name": "Newberry", "region": "Oregon", "latitude": 43.722, "longitude": -121.229, "elevation_meters": 2434, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/newberry", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/newberry\/Newberry-home.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4343 W12114" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or17", "vnum": "322040", "volcano_name": "Sand Mountain volcanic field", "region": "Oregon", "latitude": 44.38, "longitude": -121.93, "elevation_meters": 1664, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/sand-mountain-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/sand_mountain_field\/Sand_Mountain_volcanic_field-smithsonian-home.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N4423 W12156" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "or20", "vnum": "322070", "volcano_name": "Three Sisters", "region": "Oregon", "latitude": 44.103, "longitude": -121.768, "elevation_meters": 3157, "boilerplate": "The Three Sisters volcanic cluster contains three stratovolcanoes constructed between 120,000 and 50,000 years ago (North Sister) and 50,000 and 15,000 years ago (Middle and South Sister). The only eruptions younger than 15,000 years occurred at\/near South Sister - the Rock Mesa rhyolite (about 2,200 years ago) southwest of the summit and the Devils Chain rhyolites (about 2,000 years ago) on the volcano\u2019s eastern flank. Both episodes included lava flows and dome-building eruptions accompanied by minor to moderate explosions. These explosions created short-traveled pyroclastic flows, pumice, and ashfall up to 18.6 miles (30 km) away to the east and south.", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/three-sisters", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/three_sisters\/Three-Sisters-Home-web.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N4406 W12146" }, { "obs_abbr": "cvo", "obs_fullname": "Cascades Volcano Observatory", "obs_email": "CascadesVolcanoObservatory@usgs.gov", "volcano_cd": "wa7", "vnum": "321060", "volcano_name": "West Crater volcanic field", "region": "Washington", "latitude": 45.88, "longitude": -122.08, "elevation_meters": 1329, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/west-crater-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/west_crater\/West_Crater_LeeSiebert_107020-home.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N4553 W12205" }, { "obs_abbr": "hvo", "obs_fullname": "Hawaiian Volcano Observatory", "obs_email": "askHVO@usgs.gov", "volcano_cd": "hi1", "vnum": "332060", "volcano_name": "Haleakala", "region": "Hawaii", "latitude": 20.708, "longitude": -156.25, "elevation_meters": 3055, "boilerplate": "\u003Cb\u003EBackground:\u003C\/b\u003E The most recent eruption on Haleakal\u0101 was probably between A.D. 1480 and 1600. Haleakal\u0101 Volcano is monitored by a continuous GPS instrument and a seismometer located near the southwest edge of the summit crater. Key sites on Haleakal\u0101 are resurveyed using GPS receivers every few years to detect any changes in the volcano's shape.\r\n\r\n\u003Cb\u003EMore Information:\u003C\/b\u003E\r\nHaleakal\u0101 volcano summary also available by phone: (808) 967-8877\r\nHaleakal\u0101 website: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/haleakala\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/haleakala\u003C\/a\u003E", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/haleakal%C4%81", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/haleakala\/haleakala.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N2042 W15615" }, { "obs_abbr": "hvo", "obs_fullname": "Hawaiian Volcano Observatory", "obs_email": "askHVO@usgs.gov", "volcano_cd": "hi2", "vnum": "332040", "volcano_name": "Hualalai", "region": "Hawaii", "latitude": 19.692, "longitude": -155.87, "elevation_meters": 2523, "boilerplate": "\u003Cb\u003EBackground:\u003C\/b\u003E Hual\u0101lai is the third most active volcano on the Island of Hawai\u02bbi and typically erupts two to three times per 1,000 years. Hual\u0101lai last erupted in 1801 and, more recently, had a damaging seismic swarm in 1929 that was probably the result of a shallow intrusion of magma. Hual\u0101lai Volcano is monitored by one continuous GPS instrument and a seismometer located southeast of the summit, as well as several instruments on nearby flanks of Mauna Loa and Mauna Kea. Key sites on Hual\u0101lai and western Mauna Loa are resurveyed using GPS receivers every few years to detect any changes in the volcano's shape.\r\n\r\n\u003Cb\u003EMore Information:\u003C\/b\u003E\r\nHual\u0101lai volcano summary also available by phone: (808) 967-8877\r\nHual\u0101lai website: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/hualalai\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/hualalai\u003C\/a\u003E", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/hual%C4%81lai", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/hualalai\/hualalai.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N1942 W15552" }, { "obs_abbr": "hvo", "obs_fullname": "Hawaiian Volcano Observatory", "obs_email": "askHVO@usgs.gov", "volcano_cd": "hi4", "vnum": "332000", "volcano_name": "Kama'ehuakanaloa", "region": "Hawaii", "latitude": 18.92, "longitude": -155.27, "elevation_meters": -975, "boilerplate": "\u003Cb\u003EBackground:\u003C\/b\u003E Intermittent earthquake activity has been recorded in the vicinity of Kama'ehuakanaloa (formerly L\u014d\u2018ihi Seamount) since as early as 1952. The most energetic earthquake sequence occurred in July-August 1996, which included more than 4,000 earthquakes, with nearly 300 events larger than M3.0 and 95 events in the M4.0 to 4.9 range. More recently, a swarm of 100 earthquakes occurred on May 11, 2020, with 18 events in the M3.0 to 3.9 range. There are no working monitoring instruments on Kama'ehuakanaloa, whose peak is about 1,000 m (3,280 ft) below sea level. All real-time information about the volcano is derived from land-based seismometers on the Island of Hawai\u2018i.\r\n\r\n\u003Cb\u003EMore Information:\u003C\/b\u003E\r\nKama'ehuakanaloa website: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/loihi-seamount\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/loihi-seamount\u003C\/a\u003E", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/kama%E2%80%98ehuakanaloa", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/loihi\/loihi.jpg", "nvews_threat": "Waiting for Threat Level", "icao_coordinates": "N1855 W15516" }, { "obs_abbr": "hvo", "obs_fullname": "Hawaiian Volcano Observatory", "obs_email": "askHVO@usgs.gov", "volcano_cd": "hi3", "vnum": "332010", "volcano_name": "Kilauea", "region": "Hawaii", "latitude": 19.421, "longitude": -155.287, "elevation_meters": 1247, "boilerplate": "\u003Cb\u003EMore Information:\u003C\/b\u003E\r\nK\u012blauea activity summary also available by phone: (808) 967-8862\r\nK\u012blauea webcam images: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u003C\/a\u003E\r\nK\u012blauea photos\/video: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/photo-and-video-chronology\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/photo-and-video-chronology\u003C\/a\u003E\r\nK\u012blauea lava-flow maps: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u003C\/a\u003E\r\nK\u012blauea FAQs: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u003C\/a\u003E", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/kilauea", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/kilauea\/kilauea.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N1925 W15517" }, { "obs_abbr": "hvo", "obs_fullname": "Hawaiian Volcano Observatory", "obs_email": "askHVO@usgs.gov", "volcano_cd": "hi5", "vnum": "332030", "volcano_name": "Mauna Kea", "region": "Hawaii", "latitude": 19.82, "longitude": -155.47, "elevation_meters": 4207, "boilerplate": "\u003Cp\u003E\u003Cstrong\u003EBackground:\u003C\/strong\u003E Mauna Kea is a shield volcano in the post-shield stage; it last erupted about 4,600 years ago. Monitoring is conducted using three seismometers and one GPS receiver on the volcano, plus instruments on adjacent Kohala volcano and denser seismic and geodetic networks on the north flank of Mauna Loa to the south. From its base on the ocean floor, Mauna Kea is the tallest mountain on earth rising 4,205 m above sea level.\u003Cbr \/\u003E\u003Cbr \/\u003E\u003Cstrong\u003EMore Information:\u003C\/strong\u003E\u003Cbr \/\u003EMauna Kea volcano summary also available by phone: (808) 967-8877\u003Cbr \/\u003EMauna Kea website: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/mauna-kea\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/mauna-kea\u003C\/a\u003E\u003C\/p\u003E", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mauna-kea", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mauna_kea\/mauna_kea.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N1949 W15528" }, { "obs_abbr": "hvo", "obs_fullname": "Hawaiian Volcano Observatory", "obs_email": "askHVO@usgs.gov", "volcano_cd": "hi6", "vnum": "332020", "volcano_name": "Mauna Loa", "region": "Hawaii", "latitude": 19.475, "longitude": -155.608, "elevation_meters": 4170, "boilerplate": "\u003Cp\u003E\u003Cstrong\u003EBackground:\u003C\/strong\u003E Mauna Loa is the largest active volcano on our planet and covers half of the Island of Hawai\u02bbi. Eruptions tend to produce voluminous, fast-moving lava flows that can impact communities on the east and west sides of the Island.\u003C\/p\u003E\u003Cp\u003EMauna Loa eruptions typically start at the summit and, within minutes to months of eruption onset, can migrate into either the Northeast or Southwest Rift Zone, or radial vents on the north flank. Since its first well-documented eruption in 1843, the volcano has erupted 34 times with intervals between eruptions ranging from months to decades. Mauna Loa erupted most recently in 2022.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EMore Information:\u003C\/strong\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EMauna Loa activity summary also available by phone: (808) 967-8866\u003C\/li\u003E\u003Cli\u003EMauna Loa webcam images: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/mauna-loa\/webcams\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/mauna-loa\/webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EMauna Loa photos\/video: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/mauna-loa\/photo-and-video-chronology-mauna-loa\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/mauna-loa\/photo-and-video-chronology-mauna-loa\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EMauna Loa maps: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/mauna-loa\/maps\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/mauna-loa\/maps\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EMauna Loa FAQs: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/mauna-loa\/faqs\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/mauna-loa\/faqs\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EMap-based webpage for Mauna Loa: \u003Ca href=\u0022https:\/\/geonarrative.usgs.gov\/maunaloa\/\u0022\u003Ehttps:\/\/geonarrative.usgs.gov\/maunaloa\/\u003C\/a\u003E       \u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E \u003C\/p\u003E", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/mauna-loa", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/mauna_loa\/mauna_loa.jpg", "nvews_threat": "Very High Threat", "icao_coordinates": "N1929 W15536" }, { "obs_abbr": "hvo", "obs_fullname": "Hawaiian Volcano Observatory", "obs_email": "askHVO@usgs.gov", "volcano_cd": "nmi20", "vnum": "244010", "volcano_name": "Ofu-Olosega", "region": "American Samoa", "latitude": -14.175, "longitude": -169.618, "elevation_meters": 639, "boilerplate": "", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/ofu-olosega", "volcano_image_url": "https:\/\/d9-wret.s3.us-west-2.amazonaws.com\/assets\/palladium\/production\/s3fs-public\/styles\/full_width\/public\/media\/images\/Ofu-OlosegaFromSpace.jpg?itok=7iosJ9vP", "nvews_threat": "Low Threat", "icao_coordinates": "S1411 W16937" }, { "obs_abbr": "hvo", "obs_fullname": "Hawaiian Volcano Observatory", "obs_email": "askHVO@usgs.gov", "volcano_cd": "nmi21", "vnum": "244001", "volcano_name": "Ta'u Island", "region": "American Samoa", "latitude": -14.23, "longitude": -169.454, "elevation_meters": 931, "boilerplate": "\u003Cp\u003ETa\u02bb\u016b Island is located at the east end of the Samoan Islands, in American Samoa. It is the top of a large shield volcano, most of which is below the ocean surface. Ta‘\u016b, as well as Ofu-Olosega islands, are located on the crest of the Samoan Ridge, a predominantly submarine feature formed from volcanic activity associated with the Samoa hotspot. A \u003Ca href=\u0022https:\/\/cms.usgs.gov\/glossary\/volcano-hazards-program-glossary\u0022\u003Event\u003C\/a\u003E that erupted between Ta‘\u016b and Ofu-Olosega in 1866 is also located on the Samoan Ridge. Vailulu\u02bbu is a submarine volcano located about 25 miles (40 km) to the east of Ta\u02bb\u016b island. It has erupted multiple times over the past 50 years.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003ETa\u02bb\u016b Island website: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/ta-u-island\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/ta-u-island\u003C\/a\u003E. \u003C\/li\u003E\u003Cli\u003EVolcanoes in American Samoa website: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/volcanoes-american-samoa\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/volcanoes-american-samoa\u003C\/a\u003E. \u003C\/li\u003E\u003C\/ul\u003E", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/ta-u-island", "volcano_image_url": "https:\/\/d9-wret.s3.us-west-2.amazonaws.com\/assets\/palladium\/production\/s3fs-public\/media\/images\/Ta%27u_Island.JPG", "nvews_threat": "Low Threat", "icao_coordinates": "S1414 W16927" }, { "obs_abbr": "hvo", "obs_fullname": "Hawaiian Volcano Observatory", "obs_email": "askHVO@usgs.gov", "volcano_cd": "nmi22", "vnum": "244020", "volcano_name": "Tutuila Island", "region": "American Samoa", "latitude": -14.295, "longitude": -170.7, "elevation_meters": 653, "boilerplate": "\u003Cp\u003ETutuila is a shield volcano in the United States Territory of American Samoa. Volcanic activity in American Samoa is within the area of responsibility of the U.S. Geological Survey’s Hawaiian Volcano Observatory, based in Hilo on the Island of Hawai‘i.\u003C\/p\u003E", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/tutuila-island", "volcano_image_url": "https:\/\/d9-wret.s3.us-west-2.amazonaws.com\/assets\/palladium\/production\/s3fs-public\/styles\/full_width\/public\/media\/images\/TutuilaFromSpace.jpg?itok=QtN240lt", "nvews_threat": "Low Threat", "icao_coordinates": "S1418 W17042" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi1", "vnum": "284160", "volcano_name": "Agrigan", "region": "Northern Mariana Islands", "latitude": 18.77, "longitude": 145.67, "elevation_meters": 965, "boilerplate": "", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/agrigan", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/agrigan\/Agrigan-home.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N1846 E14540" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi2", "vnum": "284141", "volcano_name": "Ahyi Seamount", "region": "Northern Mariana Islands", "latitude": 20.437, "longitude": 145.03, "elevation_meters": -55, "boilerplate": "Ahyi seamount is a large conical submarine volcano that rises to within 180 feet (55 m) of the sea surface about 11 miles (18 km) southeast of the island of Farallon de Pajaros (Uracas) in the Northern Mariana Islands. Water discoloration has been observed over the submarine volcano during previous periods of activity, and in 1979 the crew of a fishing boat felt shocks over the summit area followed by upwelling of sulfur-bearing water. From April 24 to 25, 2001, an explosive submarine eruption was detected seismically from a seismic station on Rangiroa Atoll, Tuamotu Archipelago. The event was well constrained (+\/- 9 miles or 15 km) at a location near the southern base of Ahyi; the summit of the seamount lies within the location uncertainty. Another eruption was detected from April 24 to May 17, 2014, using data from seismometers located on subaerial volcanoes in the Northern Mariana Islands and hydrophone arrays at Wake Island. NOAA divers also reported hearing explosions while conducting coral reef research on nearby Farallon de Pajaros. The 2014 eruption of Ahyi formed a new crater near the summit of the volcano and a large landslide chute developed on its southeast flank. More recently, the volcano erupted from October 2022 to May 2023 and again from December 2023 to April 2024, characterized by submarine plumes and geophysical detections of activity on the hydrophone arrays at Wake Island. The current episode of unrest began in August 2024.", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/ahyi-seamount", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/ahyi\/ahyi-home.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N2026 E14502" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi3", "vnum": "284180", "volcano_name": "Alamagan", "region": "Northern Mariana Islands", "latitude": 17.6, "longitude": 145.83, "elevation_meters": 744, "boilerplate": "", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/alamagan", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/alamagan\/Alamagan-home.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N1736 E14550" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi4", "vnum": "284200", "volcano_name": "Anatahan", "region": "Northern Mariana Islands", "latitude": 16.35, "longitude": 145.67, "elevation_meters": 790, "boilerplate": "During times of northerly winds, the Anatahan plume, if present, could be directed towards the CNMI and Guam. If this happens, residents may notice hazy air conditions and smell sulfur. The Emergency Management Office (EMO) of the CNMI government will issue volcanic haze and sulfur advisories if appropriate. \r\n\r\nAccess to the island may be restricted by the CNMI government. Contact the EMO to get the latest information.\r\nhttp:\/\/volcano.wr.usgs.gov\/cnmistatus.php", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/anatahan", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/anatahan\/Anatahan-home1.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N1621 E14540" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi5", "vnum": "284150", "volcano_name": "Asuncion", "region": "Northern Mariana Islands", "latitude": 19.67, "longitude": 145.4, "elevation_meters": 857, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/asuncion", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/asuncion\/Asuncion-home.png", "nvews_threat": "Moderate Threat", "icao_coordinates": "N1940 E14524" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi14", "vnum": "284137", "volcano_name": "Daikoku seamount", "region": "Northern Mariana Islands", "latitude": 21.324, "longitude": 144.194, "elevation_meters": -323, "boilerplate": "", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/daikoku-seamount", "volcano_image_url": "", "nvews_threat": "Very Low Threat", "icao_coordinates": "N2119 E14412" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi15", "vnum": "284201", "volcano_name": "East Diamante", "region": "Northern Mariana Islands", "latitude": 15.93, "longitude": 145.67, "elevation_meters": -127, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/east-diamante", "volcano_image_url": "", "nvews_threat": "Moderate Threat", "icao_coordinates": "N1556 E14540" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi6", "vnum": "284210", "volcano_name": "Esmeralda Bank", "region": "Northern Mariana Islands", "latitude": 15, "longitude": 145.25, "elevation_meters": -43, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/esmeralda-bank", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/esmeralda_bank\/esmeralda_bank-home.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N1500 E14515" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi7", "vnum": "284140", "volcano_name": "Farallon de Pajaros", "region": "Northern Mariana Islands", "latitude": 20.53, "longitude": 144.9, "elevation_meters": 360, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/farallon-de-pajaros", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/farallon_de_pajaros\/Farallon_de_Pajaros-home.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N2032 E14454" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi16", "vnum": "284133", "volcano_name": "Fukujin seamount", "region": "Northern Mariana Islands", "latitude": 21.93, "longitude": 143.47, "elevation_meters": -217, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/fukujin-seamount", "volcano_image_url": "", "nvews_threat": "Very Low Threat", "icao_coordinates": "N2156 E14328" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi8", "vnum": "284190", "volcano_name": "Guguan", "region": "Northern Mariana Islands", "latitude": 17.32, "longitude": 145.85, "elevation_meters": 287, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/guguan", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/guguan\/Guguan-home.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N1719 E14551" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi17", "vnum": "284135", "volcano_name": "Kasuga 2", "region": "Northern Mariana Islands", "latitude": 21.6, "longitude": 143.637, "elevation_meters": -274, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/kasuga-2", "volcano_image_url": "", "nvews_threat": "Very Low Threat", "icao_coordinates": "N2136 E14338" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi9", "vnum": "284143", "volcano_name": "Maug Islands", "region": "Northern Mariana Islands", "latitude": 20.02, "longitude": 145.22, "elevation_meters": 227, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/maug-islands", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/maug_islands\/Maug_islands-home.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N2001 E14513" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi10", "vnum": "284170", "volcano_name": "Pagan", "region": "Northern Mariana Islands", "latitude": 18.13, "longitude": 145.8, "elevation_meters": 570, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/pagan", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/pagan\/Pagan-home.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N1808 E14548" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi11", "vnum": "284202", "volcano_name": "Ruby", "region": "Northern Mariana Islands", "latitude": 15.62, "longitude": 145.57, "elevation_meters": -174, "boilerplate": "\u003Cp\u003ERuby is a submarine volcano that rises to within 174 m of the sea surface near the southern end of the Mariana arc northwest of the island of Saipan. The volcano was first detected in eruption in 1966 by sonar signals. In 1995, submarine explosions were heard, accompanied by a fish kill, sulfurous odors, bubbling water, and the detection of volcanic tremor.\u003C\/p\u003E", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/ruby", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/ruby\/Ruby-home.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N1537 E14534" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi12", "vnum": "284192", "volcano_name": "Sarigan", "region": "Northern Mariana Islands", "latitude": 16.708, "longitude": 145.78, "elevation_meters": 538, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/sarigan", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/sarigan\/sarigan-home.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N1642 E14547" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi18", "vnum": "284193", "volcano_name": "South Sarigan seamount", "region": "Northern Mariana Islands", "latitude": 16.58, "longitude": 145.78, "elevation_meters": -184, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/south-sarigan-seamount", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N1635 E14547" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi13", "vnum": "284142", "volcano_name": "Supply Reef", "region": "Northern Mariana Islands", "latitude": 20.13, "longitude": 145.1, "elevation_meters": -8, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/supply-reef", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/supply_reef\/Supply_Reef-home.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N2008 E14506" }, { "obs_abbr": "nmi", "obs_fullname": "Northern Mariana Islands", "obs_email": "NorthernMarianaIslands@usgs.gov", "volcano_cd": "nmi19", "vnum": "284191", "volcano_name": "Zealandia Bank", "region": "Northern Mariana Islands", "latitude": 16.88, "longitude": 145.85, "elevation_meters": 0, "boilerplate": "", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/zealandia-bank", "volcano_image_url": "", "nvews_threat": "Low Threat", "icao_coordinates": "N1653 E14551" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "id3", "vnum": "324010", "volcano_name": "Black Butte Crater lava field", "region": "Idaho", "latitude": 43.18, "longitude": -114.35, "elevation_meters": 1478, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/black-butte-crater-lava-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/black_butte_crater_lava_field\/Shoshone-Panoramio.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N4311 W11421" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "ut2", "vnum": "327050", "volcano_name": "Black Rock Desert volcanic field", "region": "Utah", "latitude": 38.97, "longitude": -112.5, "elevation_meters": 1800, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/black-rock-desert-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/black_rock_desert\/BlackRockDesert-home.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N3858 W11230" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "nm1", "vnum": "327110", "volcano_name": "Carrizozo lava flow", "region": "New Mexico", "latitude": 33.78, "longitude": -105.93, "elevation_meters": 1731, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/carrizozo-lava-flow", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/carrizozo\/Carrizozo_NASA_2003138.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N3347 W10556" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "id1", "vnum": "324020", "volcano_name": "Craters of the Moon volcanic field", "region": "Idaho", "latitude": 43.42, "longitude": -113.5, "elevation_meters": 2005, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/craters-moon-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/craters_of_the_moon\/Craters_of_Moon-NPS.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N4325 W11330" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "co1", "vnum": "328010", "volcano_name": "Dotsero Volcanic Center", "region": "Colorado", "latitude": 39.65, "longitude": -107.03, "elevation_meters": 2230, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/dotsero-volcanic-center", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/dotsero\/Dotsero-home.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N3939 W10702" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "id2", "vnum": "324040", "volcano_name": "Hells Half Acre lava field", "region": "Idaho", "latitude": 43.5, "longitude": -112.45, "elevation_meters": 1631, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/hells-half-acre-lava-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/hells_half_acre\/NASA-Hells_half_acre.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N4330 W11227" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "ut3", "vnum": "327040", "volcano_name": "Markagunt Plateau volcanic field", "region": "Utah", "latitude": 37.58, "longitude": -112.67, "elevation_meters": 2840, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/markagunt-plateau-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/markagunt_plateau\/MarkaguntPlateau-Home.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N3735 W11240" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "nm4", "vnum": "327812", "volcano_name": "Red Hill-Quemado volcanic field", "region": "New Mexico", "latitude": 34.25, "longitude": -108.83, "elevation_meters": 2300, "boilerplate": null, "volcano_url": "https:\/\/volcano.si.edu\/volcano.cfm?vn=327812", "volcano_image_url": "", "nvews_threat": "Very Low Threat", "icao_coordinates": "N3415 W10850" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "az1", "vnum": "329020", "volcano_name": "San Francisco Volcanic Field", "region": "Arizona", "latitude": 35.37, "longitude": -111.5, "elevation_meters": 2447, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/san-francisco-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/san_francisco_field\/SanFranciscoVolcanicField-Aster.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N3522 W11130" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "az2", "vnum": "329010", "volcano_name": "Uinkaret volcanic field", "region": "Arizona", "latitude": 36.38, "longitude": -113.13, "elevation_meters": 1555, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/uinkaret-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/uinkaret_field\/Uinkaret-Vulcans_Throne-Crow.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N3623 W11308" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "nm2", "vnum": "327817", "volcano_name": "Valles Caldera", "region": "New Mexico", "latitude": 35.87, "longitude": -106.57, "elevation_meters": 3430, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/valles-caldera", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/valles_caldera\/Vallecaldera_NASA_2002142.jpg", "nvews_threat": "Moderate Threat", "icao_coordinates": "N3552 W10634" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "id4", "vnum": "324030", "volcano_name": "Wapi Lava Field", "region": "Idaho", "latitude": 42.88, "longitude": -113.22, "elevation_meters": 1604, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/wapi-lava-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/wapi_lava_field\/Wapi-Smithsonian.jpg", "nvews_threat": "Low Threat", "icao_coordinates": "N4253 W11313" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "wy1", "vnum": "325010", "volcano_name": "Yellowstone", "region": "Wyoming", "latitude": 44.43, "longitude": -110.67, "elevation_meters": 2805, "boilerplate": "The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.\r\n\r\nYVO Member agencies: USGS, Yellowstone National Park, University of Utah, University of Wyoming, UNAVCO, Inc., Wyoming State Geological Survey, Montana Bureau of Mines and Geology, Idaho Geological Survey", "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/yellowstone", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/yellowstone\/Yellowstone-home-img.jpg", "nvews_threat": "High Threat", "icao_coordinates": "N4426 W11040" }, { "obs_abbr": "yvo", "obs_fullname": "Yellowstone Volcano Observatory", "obs_email": "YellowstoneVolcanoObservatory@usgs.gov", "volcano_cd": "nm3", "vnum": "327120", "volcano_name": "Zuni-Bandera volcanic field", "region": "New Mexico", "latitude": 34.8, "longitude": -108, "elevation_meters": 2550, "boilerplate": null, "volcano_url": "https:\/\/www.usgs.gov\/volcanoes\/zuni-bandera-volcanic-field", "volcano_image_url": "https:\/\/volcanoes.usgs.gov\/vsc\/images\/zuni_bandera\/Zuni-BanderaLandsat-satellite-home.jpg", "nvews_threat": "Very Low Threat", "icao_coordinates": "N3448 W10800" } ]