[{"noticeTitle":"ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EALASKA VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 11:51 AM AKDT (Friday, August 1, 2025, 19:51 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EGREAT SITKIN\u003C\/b\u003E (VNUM #311120)\u003Cbr\/\u003E52\u00b04'35\u0022 N 176\u00b06'39\u0022 W, Summit Elevation 5709 ft (1740 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: WATCH\u003Cbr\/\u003ECurrent Aviation Color Code: ORANGE\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ELava continues to erupt in the summit crater of Great Sitkin Volcano. Elevated surface temperatures were observed in satellite data, with occasional steam emissions seen in clear views. High-resolution satellite views showed minor advancement of the southwest lava lobe as well as ongoing minor inflation of the southern portion of the lava dome over the past week. Occasional small earthquakes and rockfalls from the steep flow margins continue.  \u003C\/p\u003E\u003Cp\u003EThe current lava eruption began in July 2021 and has filled most of the summit crater and advanced into valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data and web cameras, and regional infrasound and lightning networks.  \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\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. \u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003ESPURR\u003C\/b\u003E (VNUM #313040)\u003Cbr\/\u003E61\u00b017'56\u0022 N 152\u00b015'14\u0022 W, Summit Elevation 11070 ft (3374 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EUnrest continues to decline at Mount Spurr. The shallow magma intrusion beneath Mount Spurr has stalled and the likelihood of an eruption is low. However, seismicity and gas emissions remain above background levels. AVO released an \u003Ca href=\u0022https:\/\/avo.alaska.edu\/news\/view\/spurr-information-statement-july-29th-2025\u0022\u003EInformation Statement\u003C\/a\u003E on July 29, 2025, summarizing the current state of the volcano and low likelihood of eruption. \u003C\/p\u003E\u003Cp\u003EEarthquake activity continues at a low rate with about 41 earthquakes (all with a magnitude less than 0.5) \u003Ca href=\u0022https:\/\/avo.alaska.edu\/image\/view\/196806\u0022\u003Elocated close to the summit of Mount Spurr or Crater Peak\u003C\/a\u003E. The number of earthquakes and their magnitudes continue to vary from week to week but \u003Ca href=\u0022https:\/\/avo.alaska.edu\/image\/view\/196805\u0022\u003Efollow an overall decreasing trend\u003C\/a\u003E. There is also some regional seismicity currently occurring near Mount Spurr that is non-volcanic and related to glacial activity at Pothole Glacier 10\u201315 km (6\u20139 miles) to the west. Ground deformation, as measured by GNSS (GPS) stations, remains paused as it has been since about mid-March 2025. Continuing low levels of volcanic gas emissions from the summit are consistent with degassing of a stalled shallow magma body. Ongoing degassing of carbon dioxide at the Crater Peak vent suggests that a deeper magma body may have also intruded under Crater Peak \u2013 possibly at 20 km (12 miles) below sea level.  \u003C\/p\u003E\u003Cp\u003EFluctuating magma ascent, rates of seismic activity, and degassing are common at volcanoes and have occurred during past Mount Spurr unrest periods with and without eruptions. We see no sign that magma is continuing to rise into the shallow crust currently; however, renewed magma ascent remains possible. In that case, we anticipate corresponding changes in our monitoring data. \u003C\/p\u003E\u003Cp\u003EAVO continues to closely monitor activity at Mount Spurr using local seismic, infrasound, and GNSS (GPS) stations, web cameras, airborne and satellite gas measurements, regional infrasound, lightning networks, and satellite images. Livestreams of Mount Spurr are available from a station located approximately 8 miles south of Mount Spurr [\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=HpVOLb1J1T4\u0022\u003EMount Spurr Live Stream (SPCL)\u003C\/a\u003E] and as viewed from Glen Alps above Anchorage [\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=FLMEJhsPwyc\u0022\u003EMount Spurr Live Stream (ANCG)\u003C\/a\u003E]. \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/avo.alaska.edu\/volcano\/spurr\u0022\u003EMount Spurr\u003C\/a\u003E 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 southcentral 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 on all sides of the volcano, especially on the south and east flanks.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003EMatt Haney, Scientist-in-Charge, USGS, mhaney@usgs.gov (907) 786-7497\u003C\/p\u003E\u003Cp\u003EJessica Larsen, Acting Coordinating Scientist, UAFGI jflarsen@alaska.edu (907) 378-5460\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EContact AVO: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/contact\u0022\u003Ehttps:\/\/avo.alaska.edu\/contact\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EThe Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.\u003C\/p\u003E","sentUtc":"2025-08-01","obs":"avo","noticeId":"DOI-USGS-AVO-2025-08-01T18:43:10+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-AVO-2025-08-01T18:43:10+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-AVO-2025-08-01T18:43:10+00:00","obsAlertLevel":"WATCH","obsColorCode":"ORANGE","noticeHighestAlertLevel":"WATCH","noticeHighestColorCode":"ORANGE","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EALASKA VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 11:51 AM AKDT (Friday, August 1, 2025, 19:51 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EGREAT SITKIN\u003C\/b\u003E (VNUM #311120)\u003Cbr\/\u003E52\u00b04'35\u0022 N 176\u00b06'39\u0022 W, Summit Elevation 5709 ft (1740 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: WATCH\u003Cbr\/\u003ECurrent Aviation Color Code: ORANGE\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ELava continues to erupt in the summit crater of Great Sitkin Volcano. Elevated surface temperatures were observed in satellite data, with occasional steam emissions seen in clear views. High-resolution satellite views showed minor advancement of the southwest lava lobe as well as ongoing minor inflation of the southern portion of the lava dome over the past week. Occasional small earthquakes and rockfalls from the steep flow margins continue.  \u003C\/p\u003E\u003Cp\u003EThe current lava eruption began in July 2021 and has filled most of the summit crater and advanced into valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data and web cameras, and regional infrasound and lightning networks.  \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\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. \u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003EThis notice contains volcanoes not displayed here:\u003C\/b\u003E Spurr (ADVISORY\/YELLOW).\u003Cbr\/\u003E\u003Cbr\/\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003EMatt Haney, Scientist-in-Charge, USGS, mhaney@usgs.gov (907) 786-7497\u003C\/p\u003E\u003Cp\u003EJessica Larsen, Acting Coordinating Scientist, UAFGI jflarsen@alaska.edu (907) 378-5460\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EContact AVO: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/contact\u0022\u003Ehttps:\/\/avo.alaska.edu\/contact\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EThe Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.\u003C\/p\u003E","summary":"\u003Cp\u003ELava continues to erupt in the summit crater of Great Sitkin Volcano. Elevated surface temperatures were observed in satellite data, with occasional steam emissions seen in clear views. High-resolution satellite views showed minor advancement of the southwest lava lobe as well as ongoing minor inflation of the southern portion of the lava dome over the past week. Occasional small earthquakes and rockfalls from the steep flow margins continue.  \u003C\/p\u003E\u003Cp\u003EThe current lava eruption began in July 2021 and has filled most of the summit crater and advanced into valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data and web cameras, and regional infrasound and lightning networks.  \u003C\/p\u003E","synopsis":"AVO Great Sitkin ORANGE\/WATCH - Slow eruption of lava within the summit crater continues","alertLevel":"WATCH","colorCode":"ORANGE","vName":"Great Sitkin","vnum":"311120","lat":52.0765,"lng":-176.1109,"vUrl":"https:\/\/www.avo.alaska.edu\/activity\/GreatSitkin.php","vImage":"https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1102983616_16_3.jpg","region":"Aleutians","sectionId":"DOI-USGS-AVO-2025-08-01T18:43:10+00:00"},{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EALASKA VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 11:51 AM AKDT (Friday, August 1, 2025, 19:51 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003ESPURR\u003C\/b\u003E (VNUM #313040)\u003Cbr\/\u003E61\u00b017'56\u0022 N 152\u00b015'14\u0022 W, Summit Elevation 11070 ft (3374 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EUnrest continues to decline at Mount Spurr. The shallow magma intrusion beneath Mount Spurr has stalled and the likelihood of an eruption is low. However, seismicity and gas emissions remain above background levels. AVO released an \u003Ca href=\u0022https:\/\/avo.alaska.edu\/news\/view\/spurr-information-statement-july-29th-2025\u0022\u003EInformation Statement\u003C\/a\u003E on July 29, 2025, summarizing the current state of the volcano and low likelihood of eruption. \u003C\/p\u003E\u003Cp\u003EEarthquake activity continues at a low rate with about 41 earthquakes (all with a magnitude less than 0.5) \u003Ca href=\u0022https:\/\/avo.alaska.edu\/image\/view\/196806\u0022\u003Elocated close to the summit of Mount Spurr or Crater Peak\u003C\/a\u003E. The number of earthquakes and their magnitudes continue to vary from week to week but \u003Ca href=\u0022https:\/\/avo.alaska.edu\/image\/view\/196805\u0022\u003Efollow an overall decreasing trend\u003C\/a\u003E. There is also some regional seismicity currently occurring near Mount Spurr that is non-volcanic and related to glacial activity at Pothole Glacier 10\u201315 km (6\u20139 miles) to the west. Ground deformation, as measured by GNSS (GPS) stations, remains paused as it has been since about mid-March 2025. Continuing low levels of volcanic gas emissions from the summit are consistent with degassing of a stalled shallow magma body. Ongoing degassing of carbon dioxide at the Crater Peak vent suggests that a deeper magma body may have also intruded under Crater Peak \u2013 possibly at 20 km (12 miles) below sea level.  \u003C\/p\u003E\u003Cp\u003EFluctuating magma ascent, rates of seismic activity, and degassing are common at volcanoes and have occurred during past Mount Spurr unrest periods with and without eruptions. We see no sign that magma is continuing to rise into the shallow crust currently; however, renewed magma ascent remains possible. In that case, we anticipate corresponding changes in our monitoring data. \u003C\/p\u003E\u003Cp\u003EAVO continues to closely monitor activity at Mount Spurr using local seismic, infrasound, and GNSS (GPS) stations, web cameras, airborne and satellite gas measurements, regional infrasound, lightning networks, and satellite images. Livestreams of Mount Spurr are available from a station located approximately 8 miles south of Mount Spurr [\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=HpVOLb1J1T4\u0022\u003EMount Spurr Live Stream (SPCL)\u003C\/a\u003E] and as viewed from Glen Alps above Anchorage [\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=FLMEJhsPwyc\u0022\u003EMount Spurr Live Stream (ANCG)\u003C\/a\u003E]. \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/avo.alaska.edu\/volcano\/spurr\u0022\u003EMount Spurr\u003C\/a\u003E 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 southcentral 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 on all sides of the volcano, especially on the south and east flanks.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003EThis notice contains volcanoes not displayed here:\u003C\/b\u003E Great Sitkin (WATCH\/ORANGE).\u003Cbr\/\u003E\u003Cbr\/\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003EMatt Haney, Scientist-in-Charge, USGS, mhaney@usgs.gov (907) 786-7497\u003C\/p\u003E\u003Cp\u003EJessica Larsen, Acting Coordinating Scientist, UAFGI jflarsen@alaska.edu (907) 378-5460\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EContact AVO: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/contact\u0022\u003Ehttps:\/\/avo.alaska.edu\/contact\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EThe Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.\u003C\/p\u003E","summary":"\u003Cp\u003EUnrest continues to decline at Mount Spurr. The shallow magma intrusion beneath Mount Spurr has stalled and the likelihood of an eruption is low. However, seismicity and gas emissions remain above background levels. AVO released an \u003Ca href=\u0022https:\/\/avo.alaska.edu\/news\/view\/spurr-information-statement-july-29th-2025\u0022\u003EInformation Statement\u003C\/a\u003E on July 29, 2025, summarizing the current state of the volcano and low likelihood of eruption. \u003C\/p\u003E\u003Cp\u003EEarthquake activity continues at a low rate with about 41 earthquakes (all with a magnitude less than 0.5) \u003Ca href=\u0022https:\/\/avo.alaska.edu\/image\/view\/196806\u0022\u003Elocated close to the summit of Mount Spurr or Crater Peak\u003C\/a\u003E. The number of earthquakes and their magnitudes continue to vary from week to week but \u003Ca href=\u0022https:\/\/avo.alaska.edu\/image\/view\/196805\u0022\u003Efollow an overall decreasing trend\u003C\/a\u003E. There is also some regional seismicity currently occurring near Mount Spurr that is non-volcanic and related to glacial activity at Pothole Glacier 10\u201315 km (6\u20139 miles) to the west. Ground deformation, as measured by GNSS (GPS) stations, remains paused as it has been since about mid-March 2025. Continuing low levels of volcanic gas emissions from the summit are consistent with degassing of a stalled shallow magma body. Ongoing degassing of carbon dioxide at the Crater Peak vent suggests that a deeper magma body may have also intruded under Crater Peak \u2013 possibly at 20 km (12 miles) below sea level.  \u003C\/p\u003E\u003Cp\u003EFluctuating magma ascent, rates of seismic activity, and degassing are common at volcanoes and have occurred during past Mount Spurr unrest periods with and without eruptions. We see no sign that magma is continuing to rise into the shallow crust currently; however, renewed magma ascent remains possible. In that case, we anticipate corresponding changes in our monitoring data. \u003C\/p\u003E\u003Cp\u003EAVO continues to closely monitor activity at Mount Spurr using local seismic, infrasound, and GNSS (GPS) stations, web cameras, airborne and satellite gas measurements, regional infrasound, lightning networks, and satellite images. Livestreams of Mount Spurr are available from a station located approximately 8 miles south of Mount Spurr [\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=HpVOLb1J1T4\u0022\u003EMount Spurr Live Stream (SPCL)\u003C\/a\u003E] and as viewed from Glen Alps above Anchorage [\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=FLMEJhsPwyc\u0022\u003EMount Spurr Live Stream (ANCG)\u003C\/a\u003E]. \u003C\/p\u003E","synopsis":"AVO Spurr YELLOW\/ADVISORY - Unrest continues to decline at Mount Spurr. July 29 Information Statement describes low eruption likelihood.","alertLevel":"ADVISORY","colorCode":"YELLOW","vName":"Spurr","vnum":"313040","lat":61.2989,"lng":-152.2539,"vUrl":"https:\/\/avo.alaska.edu\/activity\/Spurr.php","vImage":"https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107816397_82_3.jpg","region":"Cook Inlet-South Central","sectionId":"DOI-USGS-AVO-2025-08-01T18:43:11+00:00"}]},{"noticeTitle":"CALIFORNIA VOLCANO OBSERVATORY WEEKLY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003ECALIFORNIA VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ETuesday, July 29, 2025, 12:05 PM PDT (Tuesday, July 29, 2025, 19:05 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EMonitored CALIFORNIA VOLCANOES\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Volcano Alert Level: all NORMAL\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Aviation Color Code: all GREEN\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EActivity Update: \u003C\/strong\u003EAll volcanoes monitored by CalVO show normal background earthquake activity and deformation. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for July 21 (0000h PDT) to July 27 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded within the Clear Lake Volcanic Field, with a magnitude of M1.3.\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 91 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.5.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded in the Mono-Inyo area north of Long Valley, with a magnitude of M1.5.\u003Cbr\u003E\u003Cbr\u003EFive earthquakes greater than M1 were recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with the largest having a magnitude of M1.9.\u003Cbr\u003E\u003Cbr\u003ETwo earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M1.1.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded near the Salton Buttes, with a magnitude of M1.2.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ECalVO's Weekly Update only highlights volcanoes which have experienced seismic activity or volcanic unrest. If there are no comments for a volcano, CalVO has detected no earthquakes with magnitudes greater than or equal to M1.0, or any other kind of unrest. Only earthquakes with magnitudes greater than M1.0 are reported here.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThese earthquake counts are preliminary and subject to change as the earthquakes are reviewed by seismologists. The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u003C\/a\u003E. \u003Cbr\u003E\u003Cbr\u003EAs part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory monitors the volcanoes of California and Nevada and advances scientific understanding of volcanic processes in order to reduce the harmful impacts of volcanic activity. For additional USGS CalVO volcano information, background, images, and other graphics visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/calvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/calvo\u003C\/a\u003E. For general information on the USGS Volcano Hazard Program visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u0022\u003Ehttps:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u003C\/a\u003E. Statewide seismic information for California and Nevada can be found at \u003Ca href=\u0022https:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u0022\u003Ehttps:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u003C\/a\u003E.\u003Cbr\u003E\u003Cbr\u003E \u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022mailto:askCalVO@usgs.gov\u0022\u003EaskCalVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E","sentUtc":"2025-07-29","obs":"calvo","noticeId":"DOI-USGS-CALVO-2025-07-29T15:44:06+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-CALVO-2025-07-29T15:44:06+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-CALVO-2025-07-29T15:44:06+00:00","obsAlertLevel":"NORMAL","obsColorCode":"GREEN","noticeHighestAlertLevel":"UNASSIGNED","noticeHighestColorCode":"UNASSIGNED","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003ECALIFORNIA VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ETuesday, July 29, 2025, 12:05 PM PDT (Tuesday, July 29, 2025, 19:05 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EMonitored CALIFORNIA VOLCANOES\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Volcano Alert Level: all NORMAL\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Aviation Color Code: all GREEN\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EActivity Update: \u003C\/strong\u003EAll volcanoes monitored by CalVO show normal background earthquake activity and deformation. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for July 21 (0000h PDT) to July 27 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded within the Clear Lake Volcanic Field, with a magnitude of M1.3.\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 91 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.5.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded in the Mono-Inyo area north of Long Valley, with a magnitude of M1.5.\u003Cbr\u003E\u003Cbr\u003EFive earthquakes greater than M1 were recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with the largest having a magnitude of M1.9.\u003Cbr\u003E\u003Cbr\u003ETwo earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M1.1.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded near the Salton Buttes, with a magnitude of M1.2.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ECalVO's Weekly Update only highlights volcanoes which have experienced seismic activity or volcanic unrest. If there are no comments for a volcano, CalVO has detected no earthquakes with magnitudes greater than or equal to M1.0, or any other kind of unrest. Only earthquakes with magnitudes greater than M1.0 are reported here.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThese earthquake counts are preliminary and subject to change as the earthquakes are reviewed by seismologists. The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u003C\/a\u003E. \u003Cbr\u003E\u003Cbr\u003EAs part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory monitors the volcanoes of California and Nevada and advances scientific understanding of volcanic processes in order to reduce the harmful impacts of volcanic activity. For additional USGS CalVO volcano information, background, images, and other graphics visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/calvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/calvo\u003C\/a\u003E. For general information on the USGS Volcano Hazard Program visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u0022\u003Ehttps:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u003C\/a\u003E. Statewide seismic information for California and Nevada can be found at \u003Ca href=\u0022https:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u0022\u003Ehttps:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u003C\/a\u003E.\u003Cbr\u003E\u003Cbr\u003E \u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022mailto:askCalVO@usgs.gov\u0022\u003EaskCalVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E","summary":"\u003Cp\u003E\u003Cstrong\u003EMonitored CALIFORNIA VOLCANOES\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Volcano Alert Level: all NORMAL\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Aviation Color Code: all GREEN\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EActivity Update: \u003C\/strong\u003EAll volcanoes monitored by CalVO show normal background earthquake activity and deformation. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for July 21 (0000h PDT) to July 27 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded within the Clear Lake Volcanic Field, with a magnitude of M1.3.\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 91 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.5.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded in the Mono-Inyo area north of Long Valley, with a magnitude of M1.5.\u003Cbr\u003E\u003Cbr\u003EFive earthquakes greater than M1 were recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with the largest having a magnitude of M1.9.\u003Cbr\u003E\u003Cbr\u003ETwo earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M1.1.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded near the Salton Buttes, with a magnitude of M1.2.\u003C\/p\u003E","synopsis":"CALVO - CA volcanoes were at normal background levels of seismicity and deformation during the past week.","alertLevel":"UNASSIGNED","colorCode":"UNASSIGNED","vName":null,"vnum":null,"lat":null,"lng":null,"vUrl":null,"vImage":null,"region":null,"sectionId":"DOI-USGS-CALVO-2025-07-29T15:44:07+00:00"}]},{"noticeTitle":"CASCADES VOLCANO OBSERVATORY WEEKLY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003ECASCADES VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 12:47 PM PDT (Friday, August 1, 2025, 19:47 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003ECASCADE RANGE\u003C\/b\u003E (VNUM #)\u003Cbr\/\u003ECurrent Volcano Alert Level: NORMAL\u003Cbr\/\u003ECurrent Aviation Color Code: GREEN\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EActivity Update\u003C\/strong\u003E: All volcanoes in the Cascade Range of Oregon and Washington are at normal background activity levels. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EPast Week Observations\u003C\/strong\u003E: During the past week, small earthquakes were detected at Mount Rainier, Mount St. Helens, and Mount Hood. All monitoring data are consistent with background activity levels in the Cascade Range. Field crews installed a new monitoring station at Mount Hood and conducted geochemical sampling at Mount Rainier. \u003C\/p\u003E\u003Cp\u003EThe seismic swarm at Mount Rainier that began on July 8th continues at low levels. In the past week, swarm intensity has been variable but has continued to decrease since the onset of the swarm. While there have been over 1100 earthquakes associated with the swarm located by the Pacific Northwest Seismic Network and the Cascades Volcano Observatory, only about 50 earthquakes have been located in the last 7 days.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThe \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/cvo\u0022\u003EU.S. Geological Survey Cascades Volcano Observatory\u003C\/a\u003E and the \u003Ca href=\u0022https:\/\/gcc02.safelinks.protection.outlook.com\/?url=https%3A%2F%2Fpnsn.org%2F&data=05%7C01%7Cnandersen%40usgs.gov%7Cf8f6724b62494972125f08dbcc3619f7%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638328304958913681%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=dQF%2BD4G6Zl7FM9dX1BtqhZvCY6Q1VE8zyv4vNTchM9U%3D&reserved=0\u0022\u003EUniversity of Washington Pacific Northwest Seismic Network\u003C\/a\u003E continue to monitor Washington and Oregon volcanoes closely and will issue additional notifications as warranted.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EWebsite Resources\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EFor images, graphics, and general information on Cascade Range volcanoes: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/cvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/cvo\u003C\/a\u003E\u003Cbr\u003EFor seismic information on Oregon and Washington volcanoes: \u003Ca href=\u0022https:\/\/gcc02.safelinks.protection.outlook.com\/?url=http%3A%2F%2Fwww.pnsn.org%2Fvolcanoes&data=05%7C01%7Cnandersen%40usgs.gov%7Cf8f6724b62494972125f08dbcc3619f7%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638328304958913681%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=dpNU8dFaAYcU0vPQ97jACrgAPw2JLIFG1NjlGPtTvvY%3D&reserved=0\u0022\u003Ehttp:\/\/www.pnsn.org\/volcanoes\u003C\/a\u003E\u003Cbr\u003EFor information on USGS volcano alert levels and notifications: \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/volcano-notifications-deliver-situational-information\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/volcano-notifications-deliver-situational-information\u003C\/a\u003E\u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003EJon Major, Scientist-in-Charge, Cascades Volcano Observatory, \u003Ca href=\u0022mailto:jjmajor@usgs.gov\u0022\u003Ejjmajor@usgs.gov\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cbr\u003EGeneral inquiries: \u003Ca href=\u0022mailto:askCVO@usgs.gov\u0022\u003EaskCVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EMedia inquiries: \u003Ca href=\u0022mailto:volcanomedia@usgs.gov\u0022\u003Evolcanomedia@usgs.gov\u003C\/a\u003E\u003C\/p\u003E","sentUtc":"2025-08-01","obs":"cvo","noticeId":"DOI-USGS-CVO-2025-08-01T18:34:58+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-CVO-2025-08-01T18:34:58+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-CVO-2025-08-01T18:34:58+00:00","obsAlertLevel":"NORMAL","obsColorCode":"GREEN","noticeHighestAlertLevel":"NORMAL","noticeHighestColorCode":"GREEN","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003ECASCADES VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 12:47 PM PDT (Friday, August 1, 2025, 19:47 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003ECASCADE RANGE\u003C\/b\u003E (VNUM #)\u003Cbr\/\u003ECurrent Volcano Alert Level: NORMAL\u003Cbr\/\u003ECurrent Aviation Color Code: GREEN\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EActivity Update\u003C\/strong\u003E: All volcanoes in the Cascade Range of Oregon and Washington are at normal background activity levels. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EPast Week Observations\u003C\/strong\u003E: During the past week, small earthquakes were detected at Mount Rainier, Mount St. Helens, and Mount Hood. All monitoring data are consistent with background activity levels in the Cascade Range. Field crews installed a new monitoring station at Mount Hood and conducted geochemical sampling at Mount Rainier. \u003C\/p\u003E\u003Cp\u003EThe seismic swarm at Mount Rainier that began on July 8th continues at low levels. In the past week, swarm intensity has been variable but has continued to decrease since the onset of the swarm. While there have been over 1100 earthquakes associated with the swarm located by the Pacific Northwest Seismic Network and the Cascades Volcano Observatory, only about 50 earthquakes have been located in the last 7 days.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThe \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/cvo\u0022\u003EU.S. Geological Survey Cascades Volcano Observatory\u003C\/a\u003E and the \u003Ca href=\u0022https:\/\/gcc02.safelinks.protection.outlook.com\/?url=https%3A%2F%2Fpnsn.org%2F&data=05%7C01%7Cnandersen%40usgs.gov%7Cf8f6724b62494972125f08dbcc3619f7%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638328304958913681%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=dQF%2BD4G6Zl7FM9dX1BtqhZvCY6Q1VE8zyv4vNTchM9U%3D&reserved=0\u0022\u003EUniversity of Washington Pacific Northwest Seismic Network\u003C\/a\u003E continue to monitor Washington and Oregon volcanoes closely and will issue additional notifications as warranted.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EWebsite Resources\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EFor images, graphics, and general information on Cascade Range volcanoes: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/cvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/cvo\u003C\/a\u003E\u003Cbr\u003EFor seismic information on Oregon and Washington volcanoes: \u003Ca href=\u0022https:\/\/gcc02.safelinks.protection.outlook.com\/?url=http%3A%2F%2Fwww.pnsn.org%2Fvolcanoes&data=05%7C01%7Cnandersen%40usgs.gov%7Cf8f6724b62494972125f08dbcc3619f7%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638328304958913681%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=dpNU8dFaAYcU0vPQ97jACrgAPw2JLIFG1NjlGPtTvvY%3D&reserved=0\u0022\u003Ehttp:\/\/www.pnsn.org\/volcanoes\u003C\/a\u003E\u003Cbr\u003EFor information on USGS volcano alert levels and notifications: \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/volcano-notifications-deliver-situational-information\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/volcano-notifications-deliver-situational-information\u003C\/a\u003E\u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003EJon Major, Scientist-in-Charge, Cascades Volcano Observatory, \u003Ca href=\u0022mailto:jjmajor@usgs.gov\u0022\u003Ejjmajor@usgs.gov\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cbr\u003EGeneral inquiries: \u003Ca href=\u0022mailto:askCVO@usgs.gov\u0022\u003EaskCVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EMedia inquiries: \u003Ca href=\u0022mailto:volcanomedia@usgs.gov\u0022\u003Evolcanomedia@usgs.gov\u003C\/a\u003E\u003C\/p\u003E","summary":"\u003Cp\u003E\u003Cstrong\u003EActivity Update\u003C\/strong\u003E: All volcanoes in the Cascade Range of Oregon and Washington are at normal background activity levels. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EPast Week Observations\u003C\/strong\u003E: During the past week, small earthquakes were detected at Mount Rainier, Mount St. Helens, and Mount Hood. All monitoring data are consistent with background activity levels in the Cascade Range. Field crews installed a new monitoring station at Mount Hood and conducted geochemical sampling at Mount Rainier. \u003C\/p\u003E\u003Cp\u003EThe seismic swarm at Mount Rainier that began on July 8th continues at low levels. In the past week, swarm intensity has been variable but has continued to decrease since the onset of the swarm. While there have been over 1100 earthquakes associated with the swarm located by the Pacific Northwest Seismic Network and the Cascades Volcano Observatory, only about 50 earthquakes have been located in the last 7 days.\u003C\/p\u003E","synopsis":"CVO Cascade Range GREEN\/NORMAL - All volcanoes are at normal levels.","alertLevel":"NORMAL","colorCode":"GREEN","vName":"Cascade Range","vnum":null,"lat":45.61,"lng":-122.5,"vUrl":"https:\/\/volcanoes.usgs.gov\/observatories\/cvo","vImage":null,"region":"Cascade Range","sectionId":"DOI-USGS-CVO-2025-08-01T18:34:58+00:00"}]},{"noticeTitle":"HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EHAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 8:56 AM HST (Friday, August 1, 2025, 18:56 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EKILAUEA\u003C\/b\u003E (VNUM #332010)\u003Cbr\/\u003E19\u00b025'16\u0022 N 155\u00b017'13\u0022 W, Summit Elevation 4091 ft (1247 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: WATCH\u003Cbr\/\u003ECurrent Aviation Color Code: ORANGE\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EActivity Summary:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe ongoing Halema\u02bbuma\u02bbu eruption is currently paused. Episode 29 ended on July 20, 2025, after over 13 hours of sustained lava fountaining. Inflation at the summit continues, along with low-level seismic tremor and degassing. Current inflation data suggest that episode 30 may start between now and Sunday night.\u003C\/p\u003E\u003Cp\u003ENo significant activity has been noted along K\u012blauea\u2019s East Rift Zone or Southwest Rift Zone.\u003C\/p\u003E\u003Cp\u003ECurrent hazards include volcanic gas emissions, along with windblown volcanic glass (Pele\u2019s hair) and tephra deposited during earlier eruptive episodes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EWeak glow was visible from the north vent overnight. Incandescence in other parts of the crater remains very low, with weak, intermittent glow from two areas higher up on the eruptive cone. There has been no movement or incandescent breakouts from lava flows on the floor of Halema\u02bbuma\u02bbu. Slow slumping of the eruptive cone is possible as it cools.\u003C\/p\u003E\u003Cp\u003EElevated degassing continues from the vent. Average sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rates during inter-episode pauses are typically 1,200 to 1,500 t\/d, though emission rates vary on short time scales in association with gas pistoning. \u003C\/p\u003E\u003Cp\u003EBackground seismic tremor remains low during the eruption pause. \u003C\/p\u003E\u003Cp\u003ESummit tiltmeters have recorded roughly 1.5 microradians of inflation in the past 24 hours. Fountaining associated with Episode 29 resulted in approximately 19 microradians of deflation. At the time of this update, UWD had re-inflated by about 17 microradians since the end of Episode 29. \u003C\/p\u003E\u003Cp\u003EStrands of volcanic glass known as Pele\u2019s hair are present throughout the summit area of Hawai\u02bbi Volcanoes National Park and surrounding communities and can be remobilized by wind even after fountaining has ceased.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEruption resources, including the most recent map and a timeline of eruption episodes since December 23, 2024: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EThree K\u012blauea summit livestream videos that show eruptive lava fountains are available here: \u003Ca href=\u0022https:\/\/www.youtube.com\/@usgs\/streams\u0022\u003Ehttps:\/\/www.youtube.com\/@usgs\/streams\u003C\/a\u003E \u003C\/li\u003E\u003Cli\u003ESummit eruption webcams:\u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u0022\u003E https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EVolcano Watch article on gas pistoning: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E\u003Cstrong\u003ERift Zone Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ERates of seismicity and ground deformation remain very low in the East Rift Zone and Southwest Rift Zone, with no significant earthquake activity in the past 24 hours. Sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emissions from the East Rift Zone remain below the detection limit.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis:\u202f\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ESummit inflation, low-level degassing, the return of glow in the north vent, and seismic tremor, all suggest that another episode of fountaining is likely. Current inflation data suggests that the next episode may occur between now and Sunday night. If inflation rates change significantly, the projected window will be adjusted to fit the new conditions.\u003C\/p\u003E\u003Cp\u003EThe current eruption has been characterized by episodic lava fountaining not seen in any eruptions since the 1983\u201386 episodic fountains at the beginning of the Pu\u02bbu\u02bb\u014d\u02bb\u014d eruption. Lava fountains and flows have erupted from two vents within Halema\u02bbuma\u02bbu crater that we refer to as the north vent and south vent. Each of the previous fountaining episodes lasted from a few hours to over a week and was accompanied by strong deflation of the summit region. Pauses between the fountaining episodes have been marked by an immediate switch from deflation to inflation as the magma chamber recharges and repressurizes. Fountaining episodes have occurred approximately once per week since the start of the current eruption on December 23, 2024.\u003C\/p\u003E\u003Cp\u003EHVO continues to closely monitor K\u012blauea and is in contact with Hawai\u2018i Volcanoes National Park and the Hawai\u2018i County Civil Defense Agency about eruptive hazards.\u003C\/p\u003E\u003Cp\u003EPlease see the Hawai\u02bbi Volcanoes National Park website for visitor information: \u003Ca href=\u0022https:\/\/www.nps.gov\/havo\/index.htm\u0022\u003Ehttps:\/\/www.nps.gov\/havo\/index.htm\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHazards: \u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThis episodic eruption is occurring within a closed area of Hawai'i Volcanoes National Park. High levels of volcanic gas\u2014primarily water vapor (H\u003Csub\u003E2\u003C\/sub\u003EO), carbon dioxide (CO\u003Csub\u003E2\u003C\/sub\u003E), and sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E)\u2014are one major hazard of concern, as this hazard can have far-reaching\u202feffects downwind. As SO\u003Csub\u003E2\u003C\/sub\u003E\u202fis continuously released from the summit during an eruption, it will react in the atmosphere to create the visible haze known as vog\u202f(volcanic smog) downwind of\u202fK\u012blauea.\u202fSO\u003Csub\u003E2\u003C\/sub\u003E and vog may cause respiratory and other problems at high concentrations. Further information on vog can be found at\u202f\u003Ca href=\u0022https:\/\/vog.ivhhn.org\/\u0022\u003Ehttps:\/\/vog.ivhhn.org\/\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003EAnother major hazard is fallout of Pele's hair and other volcanic fragments from lava fountains. Pele's hair is strands of volcanic glass often produced by lava fountaining activity that can be carried well over 10 miles (15 kilometers) from the vent. Other hot glassy volcanic fragments (tephra) including volcanic ash, pumice, scoria, and reticulite can fall on the ground within 1-3 miles (1-5 kilometers) of the eruptive vent(s), with the highest concentrations immediately downwind of the vent(s). Various volcanic fragments have fallen on Highway 11 west of Hawai'i Volcanoes National Park at times, depending on wind and eruption conditions. Strong winds may waft light particles, including Pele's hair, to greater distances downwind. Once on the ground, Pele's hair can sometimes cluster and tangle together, giving it the appearance of a tumbleweed. The extent of Pele's hair deposition is dependent on lava fountaining activity and wind conditions. Residents and visitors should minimize exposure to Pele's hair and other glassy volcanic fragments, which can cause skin and eye irritation and can also contaminate catchment water supplies. More information about how Pele's hair, its hazards, and what to do is available here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-recent-lava-fountains-highlight-peles-hair-hazards\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-recent-lava-fountains-highlight-peles-hair-hazards\u003C\/a\u003E. A recently updated Frequently Asked Questions document that includes information about potential health effects of Pele's hair is available here: \u003Ca href=\u0022https:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u0022\u003Ehttps:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003EHawaiian lava flows generally advance slowly downslope, and during this eruption flows have been confined to Halema\u02bbuma\u02bbu crater and the southwest side of Kaluapele, K\u012blauea's summit caldera.\u003C\/p\u003E\u003Cp\u003EOther significant hazards also remain around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes within the area closed to the public. This underscores the extremely hazardous nature of\u202fK\u012blauea's\u202fcaldera rim surrounding\u202fHalema\u02bbuma\u02bbu\u202fcrater, an area that has been closed to the public since late 2007.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\u003Cstrong\u003EMore Information:\u003C\/strong\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EK\u012blauea activity summary also available by phone: \u003Ca href=\u0022tel:(808) 967-8862\u0022\u003E(808) 967-8862\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea webcam images: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\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\u003C\/li\u003E\u003Cli\u003EK\u012blauea lava-flow maps: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea FAQs: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThe Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai\u02bbi and American Samoa.\u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022mailto:askHVO@usgs.gov\u0022\u003EaskHVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ESubscribe to these messages: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/vns2\/\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/vns2\/\u003C\/a\u003E\u003Cbr\u003ESummary of volcanic hazards from eruptions: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/hazards\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/hazards\u003C\/a\u003E\u003Cbr\u003ERecent earthquakes in Hawai\u02bbi (map and list): \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\u003C\/a\u003E\u003Cbr\u003EExplanation of Volcano Alert Levels and Aviation Color Codes: \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u003C\/a\u003E\u003C\/p\u003E","sentUtc":"2025-08-01","obs":"hvo","noticeId":"DOI-USGS-HVO-2025-08-01T18:22:49+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-HVO-2025-08-01T18:22:49+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-HVO-2025-08-01T18:22:49+00:00","obsAlertLevel":"WATCH","obsColorCode":"ORANGE","noticeHighestAlertLevel":"WATCH","noticeHighestColorCode":"ORANGE","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EHAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 8:56 AM HST (Friday, August 1, 2025, 18:56 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EKILAUEA\u003C\/b\u003E (VNUM #332010)\u003Cbr\/\u003E19\u00b025'16\u0022 N 155\u00b017'13\u0022 W, Summit Elevation 4091 ft (1247 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: WATCH\u003Cbr\/\u003ECurrent Aviation Color Code: ORANGE\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EActivity Summary:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe ongoing Halema\u02bbuma\u02bbu eruption is currently paused. Episode 29 ended on July 20, 2025, after over 13 hours of sustained lava fountaining. Inflation at the summit continues, along with low-level seismic tremor and degassing. Current inflation data suggest that episode 30 may start between now and Sunday night.\u003C\/p\u003E\u003Cp\u003ENo significant activity has been noted along K\u012blauea\u2019s East Rift Zone or Southwest Rift Zone.\u003C\/p\u003E\u003Cp\u003ECurrent hazards include volcanic gas emissions, along with windblown volcanic glass (Pele\u2019s hair) and tephra deposited during earlier eruptive episodes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EWeak glow was visible from the north vent overnight. Incandescence in other parts of the crater remains very low, with weak, intermittent glow from two areas higher up on the eruptive cone. There has been no movement or incandescent breakouts from lava flows on the floor of Halema\u02bbuma\u02bbu. Slow slumping of the eruptive cone is possible as it cools.\u003C\/p\u003E\u003Cp\u003EElevated degassing continues from the vent. Average sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rates during inter-episode pauses are typically 1,200 to 1,500 t\/d, though emission rates vary on short time scales in association with gas pistoning. \u003C\/p\u003E\u003Cp\u003EBackground seismic tremor remains low during the eruption pause. \u003C\/p\u003E\u003Cp\u003ESummit tiltmeters have recorded roughly 1.5 microradians of inflation in the past 24 hours. Fountaining associated with Episode 29 resulted in approximately 19 microradians of deflation. At the time of this update, UWD had re-inflated by about 17 microradians since the end of Episode 29. \u003C\/p\u003E\u003Cp\u003EStrands of volcanic glass known as Pele\u2019s hair are present throughout the summit area of Hawai\u02bbi Volcanoes National Park and surrounding communities and can be remobilized by wind even after fountaining has ceased.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEruption resources, including the most recent map and a timeline of eruption episodes since December 23, 2024: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EThree K\u012blauea summit livestream videos that show eruptive lava fountains are available here: \u003Ca href=\u0022https:\/\/www.youtube.com\/@usgs\/streams\u0022\u003Ehttps:\/\/www.youtube.com\/@usgs\/streams\u003C\/a\u003E \u003C\/li\u003E\u003Cli\u003ESummit eruption webcams:\u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u0022\u003E https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EVolcano Watch article on gas pistoning: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E\u003Cstrong\u003ERift Zone Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ERates of seismicity and ground deformation remain very low in the East Rift Zone and Southwest Rift Zone, with no significant earthquake activity in the past 24 hours. Sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emissions from the East Rift Zone remain below the detection limit.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis:\u202f\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ESummit inflation, low-level degassing, the return of glow in the north vent, and seismic tremor, all suggest that another episode of fountaining is likely. Current inflation data suggests that the next episode may occur between now and Sunday night. If inflation rates change significantly, the projected window will be adjusted to fit the new conditions.\u003C\/p\u003E\u003Cp\u003EThe current eruption has been characterized by episodic lava fountaining not seen in any eruptions since the 1983\u201386 episodic fountains at the beginning of the Pu\u02bbu\u02bb\u014d\u02bb\u014d eruption. Lava fountains and flows have erupted from two vents within Halema\u02bbuma\u02bbu crater that we refer to as the north vent and south vent. Each of the previous fountaining episodes lasted from a few hours to over a week and was accompanied by strong deflation of the summit region. Pauses between the fountaining episodes have been marked by an immediate switch from deflation to inflation as the magma chamber recharges and repressurizes. Fountaining episodes have occurred approximately once per week since the start of the current eruption on December 23, 2024.\u003C\/p\u003E\u003Cp\u003EHVO continues to closely monitor K\u012blauea and is in contact with Hawai\u2018i Volcanoes National Park and the Hawai\u2018i County Civil Defense Agency about eruptive hazards.\u003C\/p\u003E\u003Cp\u003EPlease see the Hawai\u02bbi Volcanoes National Park website for visitor information: \u003Ca href=\u0022https:\/\/www.nps.gov\/havo\/index.htm\u0022\u003Ehttps:\/\/www.nps.gov\/havo\/index.htm\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHazards: \u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThis episodic eruption is occurring within a closed area of Hawai'i Volcanoes National Park. High levels of volcanic gas\u2014primarily water vapor (H\u003Csub\u003E2\u003C\/sub\u003EO), carbon dioxide (CO\u003Csub\u003E2\u003C\/sub\u003E), and sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E)\u2014are one major hazard of concern, as this hazard can have far-reaching\u202feffects downwind. As SO\u003Csub\u003E2\u003C\/sub\u003E\u202fis continuously released from the summit during an eruption, it will react in the atmosphere to create the visible haze known as vog\u202f(volcanic smog) downwind of\u202fK\u012blauea.\u202fSO\u003Csub\u003E2\u003C\/sub\u003E and vog may cause respiratory and other problems at high concentrations. Further information on vog can be found at\u202f\u003Ca href=\u0022https:\/\/vog.ivhhn.org\/\u0022\u003Ehttps:\/\/vog.ivhhn.org\/\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003EAnother major hazard is fallout of Pele's hair and other volcanic fragments from lava fountains. Pele's hair is strands of volcanic glass often produced by lava fountaining activity that can be carried well over 10 miles (15 kilometers) from the vent. Other hot glassy volcanic fragments (tephra) including volcanic ash, pumice, scoria, and reticulite can fall on the ground within 1-3 miles (1-5 kilometers) of the eruptive vent(s), with the highest concentrations immediately downwind of the vent(s). Various volcanic fragments have fallen on Highway 11 west of Hawai'i Volcanoes National Park at times, depending on wind and eruption conditions. Strong winds may waft light particles, including Pele's hair, to greater distances downwind. Once on the ground, Pele's hair can sometimes cluster and tangle together, giving it the appearance of a tumbleweed. The extent of Pele's hair deposition is dependent on lava fountaining activity and wind conditions. Residents and visitors should minimize exposure to Pele's hair and other glassy volcanic fragments, which can cause skin and eye irritation and can also contaminate catchment water supplies. More information about how Pele's hair, its hazards, and what to do is available here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-recent-lava-fountains-highlight-peles-hair-hazards\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-recent-lava-fountains-highlight-peles-hair-hazards\u003C\/a\u003E. A recently updated Frequently Asked Questions document that includes information about potential health effects of Pele's hair is available here: \u003Ca href=\u0022https:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u0022\u003Ehttps:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003EHawaiian lava flows generally advance slowly downslope, and during this eruption flows have been confined to Halema\u02bbuma\u02bbu crater and the southwest side of Kaluapele, K\u012blauea's summit caldera.\u003C\/p\u003E\u003Cp\u003EOther significant hazards also remain around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes within the area closed to the public. This underscores the extremely hazardous nature of\u202fK\u012blauea's\u202fcaldera rim surrounding\u202fHalema\u02bbuma\u02bbu\u202fcrater, an area that has been closed to the public since late 2007.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\u003Cstrong\u003EMore Information:\u003C\/strong\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EK\u012blauea activity summary also available by phone: \u003Ca href=\u0022tel:(808) 967-8862\u0022\u003E(808) 967-8862\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea webcam images: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\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\u003C\/li\u003E\u003Cli\u003EK\u012blauea lava-flow maps: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea FAQs: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThe Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai\u02bbi and American Samoa.\u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022mailto:askHVO@usgs.gov\u0022\u003EaskHVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ESubscribe to these messages: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/vns2\/\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/vns2\/\u003C\/a\u003E\u003Cbr\u003ESummary of volcanic hazards from eruptions: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/hazards\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/hazards\u003C\/a\u003E\u003Cbr\u003ERecent earthquakes in Hawai\u02bbi (map and list): \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\u003C\/a\u003E\u003Cbr\u003EExplanation of Volcano Alert Levels and Aviation Color Codes: \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u003C\/a\u003E\u003C\/p\u003E","summary":"\u003Cp\u003E\u003Cstrong\u003EActivity Summary:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe ongoing Halema\u02bbuma\u02bbu eruption is currently paused. Episode 29 ended on July 20, 2025, after over 13 hours of sustained lava fountaining. Inflation at the summit continues, along with low-level seismic tremor and degassing. Current inflation data suggest that episode 30 may start between now and Sunday night.\u003C\/p\u003E\u003Cp\u003ENo significant activity has been noted along K\u012blauea\u2019s East Rift Zone or Southwest Rift Zone.\u003C\/p\u003E\u003Cp\u003ECurrent hazards include volcanic gas emissions, along with windblown volcanic glass (Pele\u2019s hair) and tephra deposited during earlier eruptive episodes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EWeak glow was visible from the north vent overnight. Incandescence in other parts of the crater remains very low, with weak, intermittent glow from two areas higher up on the eruptive cone. There has been no movement or incandescent breakouts from lava flows on the floor of Halema\u02bbuma\u02bbu. Slow slumping of the eruptive cone is possible as it cools.\u003C\/p\u003E\u003Cp\u003EElevated degassing continues from the vent. Average sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rates during inter-episode pauses are typically 1,200 to 1,500 t\/d, though emission rates vary on short time scales in association with gas pistoning. \u003C\/p\u003E\u003Cp\u003EBackground seismic tremor remains low during the eruption pause. \u003C\/p\u003E\u003Cp\u003ESummit tiltmeters have recorded roughly 1.5 microradians of inflation in the past 24 hours. Fountaining associated with Episode 29 resulted in approximately 19 microradians of deflation. At the time of this update, UWD had re-inflated by about 17 microradians since the end of Episode 29. \u003C\/p\u003E\u003Cp\u003EStrands of volcanic glass known as Pele\u2019s hair are present throughout the summit area of Hawai\u02bbi Volcanoes National Park and surrounding communities and can be remobilized by wind even after fountaining has ceased.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEruption resources, including the most recent map and a timeline of eruption episodes since December 23, 2024: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EThree K\u012blauea summit livestream videos that show eruptive lava fountains are available here: \u003Ca href=\u0022https:\/\/www.youtube.com\/@usgs\/streams\u0022\u003Ehttps:\/\/www.youtube.com\/@usgs\/streams\u003C\/a\u003E \u003C\/li\u003E\u003Cli\u003ESummit eruption webcams:\u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u0022\u003E https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EVolcano Watch article on gas pistoning: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E\u003Cstrong\u003ERift Zone Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ERates of seismicity and ground deformation remain very low in the East Rift Zone and Southwest Rift Zone, with no significant earthquake activity in the past 24 hours. Sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emissions from the East Rift Zone remain below the detection limit.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis:\u202f\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ESummit inflation, low-level degassing, the return of glow in the north vent, and seismic tremor, all suggest that another episode of fountaining is likely. Current inflation data suggests that the next episode may occur between now and Sunday night. If inflation rates change significantly, the projected window will be adjusted to fit the new conditions.\u003C\/p\u003E\u003Cp\u003EThe current eruption has been characterized by episodic lava fountaining not seen in any eruptions since the 1983\u201386 episodic fountains at the beginning of the Pu\u02bbu\u02bb\u014d\u02bb\u014d eruption. Lava fountains and flows have erupted from two vents within Halema\u02bbuma\u02bbu crater that we refer to as the north vent and south vent. Each of the previous fountaining episodes lasted from a few hours to over a week and was accompanied by strong deflation of the summit region. Pauses between the fountaining episodes have been marked by an immediate switch from deflation to inflation as the magma chamber recharges and repressurizes. Fountaining episodes have occurred approximately once per week since the start of the current eruption on December 23, 2024.\u003C\/p\u003E\u003Cp\u003EHVO continues to closely monitor K\u012blauea and is in contact with Hawai\u2018i Volcanoes National Park and the Hawai\u2018i County Civil Defense Agency about eruptive hazards.\u003C\/p\u003E\u003Cp\u003EPlease see the Hawai\u02bbi Volcanoes National Park website for visitor information: \u003Ca href=\u0022https:\/\/www.nps.gov\/havo\/index.htm\u0022\u003Ehttps:\/\/www.nps.gov\/havo\/index.htm\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHazards: \u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThis episodic eruption is occurring within a closed area of Hawai'i Volcanoes National Park. High levels of volcanic gas\u2014primarily water vapor (H\u003Csub\u003E2\u003C\/sub\u003EO), carbon dioxide (CO\u003Csub\u003E2\u003C\/sub\u003E), and sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E)\u2014are one major hazard of concern, as this hazard can have far-reaching\u202feffects downwind. As SO\u003Csub\u003E2\u003C\/sub\u003E\u202fis continuously released from the summit during an eruption, it will react in the atmosphere to create the visible haze known as vog\u202f(volcanic smog) downwind of\u202fK\u012blauea.\u202fSO\u003Csub\u003E2\u003C\/sub\u003E and vog may cause respiratory and other problems at high concentrations. Further information on vog can be found at\u202f\u003Ca href=\u0022https:\/\/vog.ivhhn.org\/\u0022\u003Ehttps:\/\/vog.ivhhn.org\/\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003EAnother major hazard is fallout of Pele's hair and other volcanic fragments from lava fountains. Pele's hair is strands of volcanic glass often produced by lava fountaining activity that can be carried well over 10 miles (15 kilometers) from the vent. Other hot glassy volcanic fragments (tephra) including volcanic ash, pumice, scoria, and reticulite can fall on the ground within 1-3 miles (1-5 kilometers) of the eruptive vent(s), with the highest concentrations immediately downwind of the vent(s). Various volcanic fragments have fallen on Highway 11 west of Hawai'i Volcanoes National Park at times, depending on wind and eruption conditions. Strong winds may waft light particles, including Pele's hair, to greater distances downwind. Once on the ground, Pele's hair can sometimes cluster and tangle together, giving it the appearance of a tumbleweed. The extent of Pele's hair deposition is dependent on lava fountaining activity and wind conditions. Residents and visitors should minimize exposure to Pele's hair and other glassy volcanic fragments, which can cause skin and eye irritation and can also contaminate catchment water supplies. More information about how Pele's hair, its hazards, and what to do is available here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-recent-lava-fountains-highlight-peles-hair-hazards\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-recent-lava-fountains-highlight-peles-hair-hazards\u003C\/a\u003E. A recently updated Frequently Asked Questions document that includes information about potential health effects of Pele's hair is available here: \u003Ca href=\u0022https:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u0022\u003Ehttps:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003EHawaiian lava flows generally advance slowly downslope, and during this eruption flows have been confined to Halema\u02bbuma\u02bbu crater and the southwest side of Kaluapele, K\u012blauea's summit caldera.\u003C\/p\u003E\u003Cp\u003EOther significant hazards also remain around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes within the area closed to the public. This underscores the extremely hazardous nature of\u202fK\u012blauea's\u202fcaldera rim surrounding\u202fHalema\u02bbuma\u02bbu\u202fcrater, an area that has been closed to the public since late 2007.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E","synopsis":"HVO Kilauea ORANGE\/WATCH - Episode 29 of the Halema\u02bbuma\u02bbu eruption ended on July 20, 2025. The eruption is currently paused.","alertLevel":"WATCH","colorCode":"ORANGE","vName":"Kilauea","vnum":"332010","lat":19.421,"lng":-155.287,"vUrl":"https:\/\/www.usgs.gov\/volcanoes\/kilauea","vImage":"https:\/\/volcanoes.usgs.gov\/vsc\/images\/kilauea\/kilauea.jpg","region":"Hawaii","sectionId":"DOI-USGS-HVO-2025-08-01T18:22:49+00:00"}]},{"noticeTitle":"NORTHERN MARIANA ISLANDS WEEKLY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003ENORTHERN MARIANA ISLANDS WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 9:46 AM ChST (Thursday, July 31, 2025, 23:46 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cp\u003EReport prepared by the U.S. Geological Survey.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003ENORTHERN MARIANAS VOLCANOES\u003C\/strong\u003E\u003Cbr\u003ENo signs of significant unrest were detected at the Northern Mariana Island volcanoes during the past week. \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EMonitoring of Northern Mariana Islands Volcanoes\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ENorthern Mariana Island volcanoes are monitored using seismo-acoustic sensors on Saipan, and by examining satellite imagery. We also use distant seismic stations in Guam and Chichijima, Japan, and hydroacoustic data from Wake Island, when available. \u003C\/p\u003E\u003Cp\u003EThis level of monitoring can detect significant volcanic activity in the CNMI but cannot provide advanced warning of eruptions.\u003C\/p\u003E\u003Cp\u003EDue to a lack of geophysical monitoring on any of the volcanic islands, all volcanoes have alert levels of UNASSIGNED. This includes Ahyi, Anatahan, Sarigan, Farallon de Pajaros, Supply Reef, Maug, Asuncion, Agrigan, Pagan, Almagan, and Guguan.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EFor definitions of Aviation Color Codes and Volcano Alert Levels: https:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u003Cbr\u003E\u003Cbr\u003ESUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http:\/\/volcanoes.usgs.gov\/vns\/\u003Cbr\u003E \u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003ECNMI Homeland Security and Emergency Management\u003Cbr\u003Ehttps:\/\/opd.gov.mp\/library\/agency\/homeland-security-and-emergency-management.html\u003C\/p\u003E\u003Cp\u003E\u003Cbr\u003EUSGS Northern Mariana Duty Scientist (907) 786-7497\u003Cbr\u003Ehttp:\/\/volcano.wr.usgs.gov\/cnmistatus.php\u003Cbr\u003E\u003Cbr\u003ESatellite information, Washington VAAC\u003Cbr\u003Ehttp:\/\/www.ssd.noaa.gov\/VAAC\/washington.html\u003C\/p\u003E","sentUtc":"2025-07-31","obs":"nmi","noticeId":"DOI-USGS-NMI-2025-07-31T23:45:21+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-NMI-2025-07-31T23:45:21+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-NMI-2025-07-31T23:45:21+00:00","obsAlertLevel":"UNASSIGNED","obsColorCode":"UNASSIGNED","noticeHighestAlertLevel":"UNASSIGNED","noticeHighestColorCode":"UNASSIGNED","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003ENORTHERN MARIANA ISLANDS WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 9:46 AM ChST (Thursday, July 31, 2025, 23:46 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cp\u003EReport prepared by the U.S. Geological Survey.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003ENORTHERN MARIANAS VOLCANOES\u003C\/strong\u003E\u003Cbr\u003ENo signs of significant unrest were detected at the Northern Mariana Island volcanoes during the past week. \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EMonitoring of Northern Mariana Islands Volcanoes\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ENorthern Mariana Island volcanoes are monitored using seismo-acoustic sensors on Saipan, and by examining satellite imagery. We also use distant seismic stations in Guam and Chichijima, Japan, and hydroacoustic data from Wake Island, when available. \u003C\/p\u003E\u003Cp\u003EThis level of monitoring can detect significant volcanic activity in the CNMI but cannot provide advanced warning of eruptions.\u003C\/p\u003E\u003Cp\u003EDue to a lack of geophysical monitoring on any of the volcanic islands, all volcanoes have alert levels of UNASSIGNED. This includes Ahyi, Anatahan, Sarigan, Farallon de Pajaros, Supply Reef, Maug, Asuncion, Agrigan, Pagan, Almagan, and Guguan.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EFor definitions of Aviation Color Codes and Volcano Alert Levels: https:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u003Cbr\u003E\u003Cbr\u003ESUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http:\/\/volcanoes.usgs.gov\/vns\/\u003Cbr\u003E \u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003ECNMI Homeland Security and Emergency Management\u003Cbr\u003Ehttps:\/\/opd.gov.mp\/library\/agency\/homeland-security-and-emergency-management.html\u003C\/p\u003E\u003Cp\u003E\u003Cbr\u003EUSGS Northern Mariana Duty Scientist (907) 786-7497\u003Cbr\u003Ehttp:\/\/volcano.wr.usgs.gov\/cnmistatus.php\u003Cbr\u003E\u003Cbr\u003ESatellite information, Washington VAAC\u003Cbr\u003Ehttp:\/\/www.ssd.noaa.gov\/VAAC\/washington.html\u003C\/p\u003E","summary":"\u003Cp\u003E\u003Cstrong\u003ENORTHERN MARIANAS VOLCANOES\u003C\/strong\u003E\u003Cbr\u003ENo signs of significant unrest were detected at the Northern Mariana Island volcanoes during the past week. \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EMonitoring of Northern Mariana Islands Volcanoes\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ENorthern Mariana Island volcanoes are monitored using seismo-acoustic sensors on Saipan, and by examining satellite imagery. We also use distant seismic stations in Guam and Chichijima, Japan, and hydroacoustic data from Wake Island, when available. \u003C\/p\u003E\u003Cp\u003EThis level of monitoring can detect significant volcanic activity in the CNMI but cannot provide advanced warning of eruptions.\u003C\/p\u003E\u003Cp\u003EDue to a lack of geophysical monitoring on any of the volcanic islands, all volcanoes have alert levels of UNASSIGNED. This includes Ahyi, Anatahan, Sarigan, Farallon de Pajaros, Supply Reef, Maug, Asuncion, Agrigan, Pagan, Almagan, and Guguan.\u003C\/p\u003E","synopsis":"NMI - No signs of significant unrest were detected at the Northern Mariana Island volcanoes during the past week.","alertLevel":"UNASSIGNED","colorCode":"UNASSIGNED","vName":null,"vnum":null,"lat":null,"lng":null,"vUrl":null,"vImage":null,"region":null,"sectionId":"DOI-USGS-NMI-2025-07-31T23:45:22+00:00"}]},{"noticeTitle":"YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EYELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 11:37 AM MDT (Friday, August 1, 2025, 17:37 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EYELLOWSTONE\u003C\/b\u003E (VNUM #325010)\u003Cbr\/\u003E44\u00b025'48\u0022 N 110\u00b040'12\u0022 W, Summit Elevation 9203 ft (2805 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: NORMAL\u003Cbr\/\u003ECurrent Aviation Color Code: GREEN\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003ESummary\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EYellowstone Caldera activity remains at background levels, with 52 located earthquakes in July (largest = M2.8). Deformation measurements indicate that the annual summertime pause in long-term caldera subsidence started in late May.  Two small eruptions of Black Diamond Pool in Biscuit Basin were recorded by a webcam on July 3 and July 14.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ESporadic minor eruptions continue at Steamboat Geyser in Norris Geyser Basin, but they have not reached an intensity that suggests a major eruption will occur soon.  There have only been 2 major eruptions of the geyser so far during 2025, indicating that the episode of frequent activity that started in 2018 is coming to a close.\u003C\/p\u003E\u003Cp\u003EThe new webcam at Biscuit Basin, installed in mid-May 2025 to track activity at Black Diamond Pool (where a hydrothermal explosion occurred on July 23, 2024), continues to send static images to \u003Ca href=\u0022https:\/\/www.usgs.gov\/media\/webcams\/biscuit-basin-webcam\u0022\u003Ehttps:\/\/www.usgs.gov\/media\/webcams\/biscuit-basin-webcam\u003C\/a\u003E.  During July, the webcam captured two small eruptions from the pool, on July 3 at 8:18 p.m. MDT and on July 14 at 3:23 a.m. MDT.  Each eruption threw muddy water 20\u201330 feet (6\u20139 meters) into the air and lasted only a few seconds.\u003C\/p\u003E\u003Cp\u003EAlso at Biscuit Basin, a new multi-parameter monitoring station was established in late July.  The station includes a GPS antenna to track ground movement, seismometer to measure ground shaking, and microphone array to record low-frequency sound waves.  Data from these sensors will soon be available via the Yellowstone Volcano Observatory website and other sources.\u003C\/p\u003E\u003Cp\u003EDuring the past month, field engineers from the University of Utah Seismograph Stations performed maintenance and upgrades on several seismic stations in the park and installed a new station near Slough Creek in the northeast part of the park.  Field engineers from the EarthScope Consortium were also in Yellowstone performing maintenance and upgrades on continuous GPS stations.\u003Cbr\u003E \u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring July 2025, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 52 earthquakes in the Yellowstone National Park region. The largest event of the month was a micro earthquake of magnitude 2.8 located about 10 miles northeast of West Yellowstone, Montana, on July 30 at 3:10 a.m. MDT.\u003C\/p\u003E\u003Cp\u003EThere were no swarms identified during the month of June.\u003C\/p\u003E\u003Cp\u003EYellowstone earthquake activity remains at background levels.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EGround Deformation\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EContinuous GPS stations in Yellowstone Caldera continue to record the annual summertime pause in subsidence or transition to slight uplift, which is caused by seasonal changes related to snowmelt and groundwater conditions.  Since late May, the caldera has risen by about 1 cm (less than half an inch), which is superimposed on the overall trend of subsidence that has been ongoing since 2015\u20132016.\u003C\/p\u003E\u003Cp\u003EAn example of GPS data can be found at http:\/\/www.unavco.org\/instrumentation\/networks\/status\/pbo\/data\/NRWY (click on Static Plots \/ Cleaned)\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThe 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.\u003Cbr\u003E\u003Cbr\u003EYVO Member agencies: USGS, Yellowstone National Park, University of Utah, University of Wyoming, Montana State University, Earthscope Consortium, Wyoming State Geological Survey, Montana Bureau of Mines and Geology, Idaho Geological Survey\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                Michael Poland, Scientist-in-Charge\u003Cbr \/\u003E\r\nmpoland@usgs.gov\u003Cbr \/\u003E","sentUtc":"2025-08-01","obs":"yvo","noticeId":"DOI-USGS-YVO-2025-08-01T17:29:31+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-YVO-2025-08-01T17:29:31+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-YVO-2025-08-01T17:29:31+00:00","obsAlertLevel":"NORMAL","obsColorCode":"GREEN","noticeHighestAlertLevel":"NORMAL","noticeHighestColorCode":"GREEN","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EYELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, August 1, 2025, 11:37 AM MDT (Friday, August 1, 2025, 17:37 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EYELLOWSTONE\u003C\/b\u003E (VNUM #325010)\u003Cbr\/\u003E44\u00b025'48\u0022 N 110\u00b040'12\u0022 W, Summit Elevation 9203 ft (2805 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: NORMAL\u003Cbr\/\u003ECurrent Aviation Color Code: GREEN\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003ESummary\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EYellowstone Caldera activity remains at background levels, with 52 located earthquakes in July (largest = M2.8). Deformation measurements indicate that the annual summertime pause in long-term caldera subsidence started in late May.  Two small eruptions of Black Diamond Pool in Biscuit Basin were recorded by a webcam on July 3 and July 14.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ESporadic minor eruptions continue at Steamboat Geyser in Norris Geyser Basin, but they have not reached an intensity that suggests a major eruption will occur soon.  There have only been 2 major eruptions of the geyser so far during 2025, indicating that the episode of frequent activity that started in 2018 is coming to a close.\u003C\/p\u003E\u003Cp\u003EThe new webcam at Biscuit Basin, installed in mid-May 2025 to track activity at Black Diamond Pool (where a hydrothermal explosion occurred on July 23, 2024), continues to send static images to \u003Ca href=\u0022https:\/\/www.usgs.gov\/media\/webcams\/biscuit-basin-webcam\u0022\u003Ehttps:\/\/www.usgs.gov\/media\/webcams\/biscuit-basin-webcam\u003C\/a\u003E.  During July, the webcam captured two small eruptions from the pool, on July 3 at 8:18 p.m. MDT and on July 14 at 3:23 a.m. MDT.  Each eruption threw muddy water 20\u201330 feet (6\u20139 meters) into the air and lasted only a few seconds.\u003C\/p\u003E\u003Cp\u003EAlso at Biscuit Basin, a new multi-parameter monitoring station was established in late July.  The station includes a GPS antenna to track ground movement, seismometer to measure ground shaking, and microphone array to record low-frequency sound waves.  Data from these sensors will soon be available via the Yellowstone Volcano Observatory website and other sources.\u003C\/p\u003E\u003Cp\u003EDuring the past month, field engineers from the University of Utah Seismograph Stations performed maintenance and upgrades on several seismic stations in the park and installed a new station near Slough Creek in the northeast part of the park.  Field engineers from the EarthScope Consortium were also in Yellowstone performing maintenance and upgrades on continuous GPS stations.\u003Cbr\u003E \u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring July 2025, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 52 earthquakes in the Yellowstone National Park region. The largest event of the month was a micro earthquake of magnitude 2.8 located about 10 miles northeast of West Yellowstone, Montana, on July 30 at 3:10 a.m. MDT.\u003C\/p\u003E\u003Cp\u003EThere were no swarms identified during the month of June.\u003C\/p\u003E\u003Cp\u003EYellowstone earthquake activity remains at background levels.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EGround Deformation\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EContinuous GPS stations in Yellowstone Caldera continue to record the annual summertime pause in subsidence or transition to slight uplift, which is caused by seasonal changes related to snowmelt and groundwater conditions.  Since late May, the caldera has risen by about 1 cm (less than half an inch), which is superimposed on the overall trend of subsidence that has been ongoing since 2015\u20132016.\u003C\/p\u003E\u003Cp\u003EAn example of GPS data can be found at http:\/\/www.unavco.org\/instrumentation\/networks\/status\/pbo\/data\/NRWY (click on Static Plots \/ Cleaned)\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThe 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.\u003Cbr\u003E\u003Cbr\u003EYVO Member agencies: USGS, Yellowstone National Park, University of Utah, University of Wyoming, Montana State University, Earthscope Consortium, Wyoming State Geological Survey, Montana Bureau of Mines and Geology, Idaho Geological Survey\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                Michael Poland, Scientist-in-Charge\u003Cbr \/\u003E\r\nmpoland@usgs.gov\u003Cbr \/\u003E","summary":"\u003Cp\u003E\u003Cstrong\u003ESummary\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EYellowstone Caldera activity remains at background levels, with 52 located earthquakes in July (largest = M2.8). Deformation measurements indicate that the annual summertime pause in long-term caldera subsidence started in late May.  Two small eruptions of Black Diamond Pool in Biscuit Basin were recorded by a webcam on July 3 and July 14.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ESporadic minor eruptions continue at Steamboat Geyser in Norris Geyser Basin, but they have not reached an intensity that suggests a major eruption will occur soon.  There have only been 2 major eruptions of the geyser so far during 2025, indicating that the episode of frequent activity that started in 2018 is coming to a close.\u003C\/p\u003E\u003Cp\u003EThe new webcam at Biscuit Basin, installed in mid-May 2025 to track activity at Black Diamond Pool (where a hydrothermal explosion occurred on July 23, 2024), continues to send static images to \u003Ca href=\u0022https:\/\/www.usgs.gov\/media\/webcams\/biscuit-basin-webcam\u0022\u003Ehttps:\/\/www.usgs.gov\/media\/webcams\/biscuit-basin-webcam\u003C\/a\u003E.  During July, the webcam captured two small eruptions from the pool, on July 3 at 8:18 p.m. MDT and on July 14 at 3:23 a.m. MDT.  Each eruption threw muddy water 20\u201330 feet (6\u20139 meters) into the air and lasted only a few seconds.\u003C\/p\u003E\u003Cp\u003EAlso at Biscuit Basin, a new multi-parameter monitoring station was established in late July.  The station includes a GPS antenna to track ground movement, seismometer to measure ground shaking, and microphone array to record low-frequency sound waves.  Data from these sensors will soon be available via the Yellowstone Volcano Observatory website and other sources.\u003C\/p\u003E\u003Cp\u003EDuring the past month, field engineers from the University of Utah Seismograph Stations performed maintenance and upgrades on several seismic stations in the park and installed a new station near Slough Creek in the northeast part of the park.  Field engineers from the EarthScope Consortium were also in Yellowstone performing maintenance and upgrades on continuous GPS stations.\u003Cbr\u003E \u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring July 2025, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 52 earthquakes in the Yellowstone National Park region. The largest event of the month was a micro earthquake of magnitude 2.8 located about 10 miles northeast of West Yellowstone, Montana, on July 30 at 3:10 a.m. MDT.\u003C\/p\u003E\u003Cp\u003EThere were no swarms identified during the month of June.\u003C\/p\u003E\u003Cp\u003EYellowstone earthquake activity remains at background levels.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EGround Deformation\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EContinuous GPS stations in Yellowstone Caldera continue to record the annual summertime pause in subsidence or transition to slight uplift, which is caused by seasonal changes related to snowmelt and groundwater conditions.  Since late May, the caldera has risen by about 1 cm (less than half an inch), which is superimposed on the overall trend of subsidence that has been ongoing since 2015\u20132016.\u003C\/p\u003E\u003Cp\u003EAn example of GPS data can be found at http:\/\/www.unavco.org\/instrumentation\/networks\/status\/pbo\/data\/NRWY (click on Static Plots \/ Cleaned)\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E","synopsis":"YVO Yellowstone GREEN\/NORMAL - YVO Monthly Update: background seismicity and deformation","alertLevel":"NORMAL","colorCode":"GREEN","vName":"Yellowstone","vnum":"325010","lat":44.43,"lng":-110.67,"vUrl":"https:\/\/www.usgs.gov\/volcanoes\/yellowstone","vImage":"https:\/\/volcanoes.usgs.gov\/vsc\/images\/yellowstone\/Yellowstone-home-img.jpg","region":"Wyoming","sectionId":"DOI-USGS-YVO-2025-08-01T17:29:31+00:00"}]}]