[{"noticeTitle":"ALASKA VOLCANO OBSERVATORY DAILY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EALASKA VOLCANO OBSERVATORY DAILY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ESaturday, April 11, 2026, 10:29 AM AKDT (Saturday, April 11, 2026, 18:29 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 slowly within the summit crater of Great Sitkin Volcano. The volcano was seismically quiet over the past day with very few observed events. Satellite and web camera images were obscured by clouds over the past day.\u003C\/p\u003E\u003Cp\u003EThe current lava eruption began in July 2021 and, since then, 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, webcams, and regional infrasound and lightning networks.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ETo view monitoring data and other information about Great Sitkin: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/volcano\/great-sitkin\u0022\u003Ehttps:\/\/avo.alaska.edu\/volcano\/great-sitkin\u003C\/a\u003E\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003EATKA VOLCANIC COMPLEX\u003C\/b\u003E (VNUM #311160)\u003Cbr\/\u003E52\u00b019'51\u0022 N 174\u00b08'20\u0022 W, Summit Elevation 5030 ft (1533 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ELow-level unrest continues at the Atka volcanic complex characterized by weak seismic tremor. Satellite observations were obscured by clouds over the past day.\u003C\/p\u003E\u003Cp\u003EThe Atka volcanic complex includes several vents, including Korovin Volcano, Mount Kliuchef and Sarichef Volcano. Korovin has been the site of most historical eruptions that typically produce minor amounts of ash and occasional but small lava flows. The Atka volcanic complex is monitored by local seismic and infrasound sensors and webcam, satellite data, and regional lightning detection instruments.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ETo view monitoring data and other information about the Atka volcano complex: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/volcano\/atka-volcanic-complex\u0022\u003Ehttps:\/\/avo.alaska.edu\/volcano\/atka-volcanic-complex\u003C\/a\u003E\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003ESHISHALDIN\u003C\/b\u003E (VNUM #311360)\u003Cbr\/\u003E54\u00b045'19\u0022 N 163\u00b058'16\u0022 W, Summit Elevation 9373 ft (2857 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 at Shishaldin Volcano. Seismic and infrasound activity remains elevated over the past day.  A plume of sulfur dioxide gas was observed in satellite data from yesterday afternoon. Satellite and web camera views of the volcano were mostly obscured by clouds over the past day. \u003C\/p\u003E\u003Cp\u003ELocal seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions. \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ETo view monitoring data and other information about Shishaldin: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/volcano\/shishaldin\u0022\u003Ehttps:\/\/avo.alaska.edu\/volcano\/shishaldin\u003C\/a\u003E\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\u003E\u003Ca href=\u0022javascript:hansJs.addContactToNotice(' + contact.observatory_contact_id + ')\u0022\u003EMatt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022javascript:hansJs.addContactToNotice(' + contact.observatory_contact_id + ')\u0022\u003EDavid Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 378-5460\u003C\/a\u003E\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":"2026-04-11","obs":"avo","noticeId":"DOI-USGS-AVO-2026-04-11T18:28:03+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-AVO-2026-04-11T18:28:03+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-AVO-2026-04-11T18:28:03+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 DAILY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ESaturday, April 11, 2026, 10:29 AM AKDT (Saturday, April 11, 2026, 18:29 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EATKA VOLCANIC COMPLEX\u003C\/b\u003E (VNUM #311160)\u003Cbr\/\u003E52\u00b019'51\u0022 N 174\u00b08'20\u0022 W, Summit Elevation 5030 ft (1533 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ELow-level unrest continues at the Atka volcanic complex characterized by weak seismic tremor. Satellite observations were obscured by clouds over the past day.\u003C\/p\u003E\u003Cp\u003EThe Atka volcanic complex includes several vents, including Korovin Volcano, Mount Kliuchef and Sarichef Volcano. Korovin has been the site of most historical eruptions that typically produce minor amounts of ash and occasional but small lava flows. The Atka volcanic complex is monitored by local seismic and infrasound sensors and webcam, satellite data, and regional lightning detection instruments.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ETo view monitoring data and other information about the Atka volcano complex: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/volcano\/atka-volcanic-complex\u0022\u003Ehttps:\/\/avo.alaska.edu\/volcano\/atka-volcanic-complex\u003C\/a\u003E\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003EThis notice contains volcanoes not displayed here:\u003C\/b\u003E Great Sitkin (WATCH\/ORANGE), Shishaldin (ADVISORY\/YELLOW).\u003Cbr\/\u003E\u003Cbr\/\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022javascript:hansJs.addContactToNotice(' + contact.observatory_contact_id + ')\u0022\u003EMatt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022javascript:hansJs.addContactToNotice(' + contact.observatory_contact_id + ')\u0022\u003EDavid Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 378-5460\u003C\/a\u003E\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\u003ELow-level unrest continues at the Atka volcanic complex characterized by weak seismic tremor. Satellite observations were obscured by clouds over the past day.\u003C\/p\u003E\u003Cp\u003EThe Atka volcanic complex includes several vents, including Korovin Volcano, Mount Kliuchef and Sarichef Volcano. Korovin has been the site of most historical eruptions that typically produce minor amounts of ash and occasional but small lava flows. The Atka volcanic complex is monitored by local seismic and infrasound sensors and webcam, satellite data, and regional lightning detection instruments.\u003C\/p\u003E","synopsis":"AVO Atka volcanic complex YELLOW\/ADVISORY - Weak seismic activity detected.","alertLevel":"ADVISORY","colorCode":"YELLOW","vName":"Atka volcanic complex","vnum":"311160","lat":52.3309,"lng":-174.139,"vUrl":"https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Atka","vImage":"","region":"Aleutians","sectionId":"DOI-USGS-AVO-2026-04-11T18:28:03+00:00"},{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EALASKA VOLCANO OBSERVATORY DAILY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ESaturday, April 11, 2026, 10:29 AM AKDT (Saturday, April 11, 2026, 18:29 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 slowly within the summit crater of Great Sitkin Volcano. The volcano was seismically quiet over the past day with very few observed events. Satellite and web camera images were obscured by clouds over the past day.\u003C\/p\u003E\u003Cp\u003EThe current lava eruption began in July 2021 and, since then, 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, webcams, and regional infrasound and lightning networks.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ETo view monitoring data and other information about Great Sitkin: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/volcano\/great-sitkin\u0022\u003Ehttps:\/\/avo.alaska.edu\/volcano\/great-sitkin\u003C\/a\u003E\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003EThis notice contains volcanoes not displayed here:\u003C\/b\u003E Atka volcanic complex (ADVISORY\/YELLOW), Shishaldin (ADVISORY\/YELLOW).\u003Cbr\/\u003E\u003Cbr\/\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022javascript:hansJs.addContactToNotice(' + contact.observatory_contact_id + ')\u0022\u003EMatt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022javascript:hansJs.addContactToNotice(' + contact.observatory_contact_id + ')\u0022\u003EDavid Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 378-5460\u003C\/a\u003E\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 slowly within the summit crater of Great Sitkin Volcano. The volcano was seismically quiet over the past day with very few observed events. Satellite and web camera images were obscured by clouds over the past day.\u003C\/p\u003E\u003Cp\u003EThe current lava eruption began in July 2021 and, since then, 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, webcams, 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-2026-04-11T18:28:04+00:00"},{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EALASKA VOLCANO OBSERVATORY DAILY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ESaturday, April 11, 2026, 10:29 AM AKDT (Saturday, April 11, 2026, 18:29 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003ESHISHALDIN\u003C\/b\u003E (VNUM #311360)\u003Cbr\/\u003E54\u00b045'19\u0022 N 163\u00b058'16\u0022 W, Summit Elevation 9373 ft (2857 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 at Shishaldin Volcano. Seismic and infrasound activity remains elevated over the past day.  A plume of sulfur dioxide gas was observed in satellite data from yesterday afternoon. Satellite and web camera views of the volcano were mostly obscured by clouds over the past day. \u003C\/p\u003E\u003Cp\u003ELocal seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions. \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ETo view monitoring data and other information about Shishaldin: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/volcano\/shishaldin\u0022\u003Ehttps:\/\/avo.alaska.edu\/volcano\/shishaldin\u003C\/a\u003E\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003EThis notice contains volcanoes not displayed here:\u003C\/b\u003E Great Sitkin (WATCH\/ORANGE), Atka volcanic complex (ADVISORY\/YELLOW).\u003Cbr\/\u003E\u003Cbr\/\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022javascript:hansJs.addContactToNotice(' + contact.observatory_contact_id + ')\u0022\u003EMatt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022javascript:hansJs.addContactToNotice(' + contact.observatory_contact_id + ')\u0022\u003EDavid Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 378-5460\u003C\/a\u003E\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 at Shishaldin Volcano. Seismic and infrasound activity remains elevated over the past day.  A plume of sulfur dioxide gas was observed in satellite data from yesterday afternoon. Satellite and web camera views of the volcano were mostly obscured by clouds over the past day. \u003C\/p\u003E\u003Cp\u003ELocal seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions. \u003C\/p\u003E","synopsis":"AVO Shishaldin YELLOW\/ADVISORY - Low-level unrest continues, with infrasound, and tremor observed. A plume of sulfur dioxide was observed in satellite data.","alertLevel":"ADVISORY","colorCode":"YELLOW","vName":"Shishaldin","vnum":"311360","lat":54.7554,"lng":-163.9711,"vUrl":"https:\/\/avo.alaska.edu\/activity\/Shishaldin.php","vImage":"https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1108075524_30_3.jpg","region":"Aleutians","sectionId":"DOI-USGS-AVO-2026-04-11T18:28:05+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, April 7, 2026, 10:29 AM PDT (Tuesday, April 7, 2026, 17:29 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 \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for March 30 (0000h PDT) to April 05 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 102 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.9.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with a magnitude of M2.1.\u003Cbr\u003E\u003Cbr\u003ETwo earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M2.3.\u003Cbr\u003E\u003Cbr\u003EFour earthquakes greater than M1 were recorded near the Salton Buttes, with the largest having a magnitude of M2.1.\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":"2026-04-07","obs":"calvo","noticeId":"DOI-USGS-CALVO-2026-04-07T16:17:32+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-CALVO-2026-04-07T16:17:32+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-CALVO-2026-04-07T16:17:32+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, April 7, 2026, 10:29 AM PDT (Tuesday, April 7, 2026, 17:29 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 \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for March 30 (0000h PDT) to April 05 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 102 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.9.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with a magnitude of M2.1.\u003Cbr\u003E\u003Cbr\u003ETwo earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M2.3.\u003Cbr\u003E\u003Cbr\u003EFour earthquakes greater than M1 were recorded near the Salton Buttes, with the largest having a magnitude of M2.1.\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 \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for March 30 (0000h PDT) to April 05 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 102 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.9.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with a magnitude of M2.1.\u003Cbr\u003E\u003Cbr\u003ETwo earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M2.3.\u003Cbr\u003E\u003Cbr\u003EFour earthquakes greater than M1 were recorded near the Salton Buttes, with the largest having a magnitude of M2.1.\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-2026-04-07T16:17:32+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, April 10, 2026, 12:05 PM PDT (Friday, April 10, 2026, 19:05 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 were at Mount St. Helens to begin the installation process for a new infrasound station.\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\u003ESeth Moran, Scientist-in-Charge, Cascades Volcano Observatory, \u003Ca href=\u0022mailto:smoran@usgs.gov\u0022\u003Esmoran@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":"2026-04-10","obs":"cvo","noticeId":"DOI-USGS-CVO-2026-04-10T19:00:39+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-CVO-2026-04-10T19:00:39+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-CVO-2026-04-10T19:00:39+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, April 10, 2026, 12:05 PM PDT (Friday, April 10, 2026, 19:05 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 were at Mount St. Helens to begin the installation process for a new infrasound station.\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\u003ESeth Moran, Scientist-in-Charge, Cascades Volcano Observatory, \u003Ca href=\u0022mailto:smoran@usgs.gov\u0022\u003Esmoran@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 were at Mount St. Helens to begin the installation process for a new infrasound station.\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-2026-04-10T19:00:39+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\u003ESaturday, April 11, 2026, 7:25 AM HST (Saturday, April 11, 2026, 17:25 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: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EOverview:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe Halema\u02bbuma\u02bbu eruption of K\u012blauea is paused. The south vent has continued to glow over the past day, and incandescence remains visible on the crater floor as lava flows from episode 44 continue to cool and solidify. Lava fountaining episode 44 ended at 7:41 p.m. HST on April 9.\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\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ENOTES: \u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EAt the time episode 44 ended, K\u012blauea's Volcano Alert Level was dropped to ADVISORY and its Aviation Color Code was dropped to YELLOW. This is a new procedure that has been adopted due to the lower ground and aviation hazards during eruptive pauses, between episodes.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EAn Information Statement on the new Volcano Alert Level and Aviation Color Code procedures can be found here: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-03T03:32:24+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-03T03:32:24+00:00\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EA Volcano Watch article on the new Volcano Alert Level and Aviation Color Code procedures can be found here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-adapting-evolving-eruption-revising-kilaueas-alert-level-and\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-adapting-evolving-eruption-revising-kilaueas-alert-level-and\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003ESignificant changes in activity between Daily Updates are posted here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThick steaming was observed yesterday in Halema\u02bbuma\u02bbu as heavy rains poured onto still-hot lava flows from episode 44, which stopped lava fountaining at 7:41 p.m. HST on April 9. Overnight, glow was visible from the south vent; both vents are now quiet and emitting plumes of gas. Lava flows on the crater floor have remained partially incandescent, and spatter emplaced near the north vent has continued to slowly creep downslope into the crater. Incandescence on the crater floor and slumping around the vent will likely continue for several more days.\u003C\/p\u003E\u003Cp\u003ESeismic tremor continues during the current pause, with bursts every 1\u201310 minutes likely associated with gas pistoning cycles in the eruptive vents.\u003C\/p\u003E\u003Cp\u003ESince the end of lava fountaining episode 44 on April 9, the U\u0113kahuna tiltmeter (UWD) has tracked approximately 4.5 microradians of inflationary tilt. This instrument recorded 17.6 microradians of deflation in total during the episode.\u003C\/p\u003E\u003Cp\u003EWith the eruption now paused, the sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rate from Halema\u02bbuma\u02bbu is likely now varying within a typical range of 1,000 to 5,000 tonnes per day. Winds near the eruptive vents were gusty out of the southwest yesterday, but they transitioned to more variable directions early this morning.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERift Zone Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ERates of seismicity and ground deformation remain low in the East Rift Zone and Southwest Rift Zone. SO\u003Csub\u003E2\u003C\/sub\u003E emissions from the East Rift Zone remain below the detection limit.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis\u003C\/strong\u003E:\u003C\/p\u003E\u003Cp\u003EThe rapid return of inflationary tilt and strong glow from both Halema\u02bbuma\u02bbu eruptive vents indicates that another lava fountaining episode is likely. At this time, there is not enough information to develop a detailed forecast window for the next episode.\u003C\/p\u003E\u003Cp\u003EK\u012blauea has been erupting episodically since December 23, 2024, from two vents (north and south) in Halema\u2018uma\u2018u. Lava fountaining episodes, which generally last for less than 12 hours, are separated by pauses that can be longer than three weeks.\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 \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecap of episode 44:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EEpisode 44 ended at 7:41 p.m. HST on April 9 after 8.5 hours of continuous lava fountaining from the north vent, sending tephra to the north into public areas of Hawai'i Volcanoes National Park and into surrounding communities. UWD tiltmeter recorded approximately 17.6 microradians of deflation during the episode.\u003C\/p\u003E\u003Cp\u003EA full summary of episode 44 can be found in a Status Report here: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-10T06:25:16+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-10T06:25:16+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EResources:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ENOTE: HVO\u2019s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations, including the SDH tiltmeter, will remain offline until we are able to re-establish access across the deep tephra field south of the caldera.\u003C\/p\u003E\u003Cp\u003EThe following links provide more information about the current eruption that began on December 23, 2024:\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\u003EShort messages tracking the evolution of the lava fountains and eruptive activity can be found here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EThree K\u012blauea summit livestream cameras 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=\u0022 https:\/\/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 pistons: \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 \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.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EVolcanic Gas: 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 continually released during an eruption. Emissions can remain locally hazardous in the areas immediately downwind of the vents, even when the vents are not actively erupting. SO\u003Csub\u003E2\u003C\/sub\u003E\u202freacts in the atmosphere to create vog (volcanic air pollution) downwind. SO\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\/li\u003E\u003Cli\u003ETephra: small glassy volcanic fragments\u2014volcanic ash, pumice, scoria, Pele\u2019s hair and reticulite\u2014are created by the lava fountains. A combination of fountaining dynamics and wind conditions determines where tephra fall may occur for any given eruption episode. Larger particles fall near the vents while light particles may be wafted greater distances. These particles may be remobilized during windy conditions following recent eruptive episodes. Residents and visitors should minimize exposure to these fragments, which can cause skin, eye, and respiratory irritation. More information and guidance on tephra fall hazards is available at \u003Ca href=\u0022https:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u0022\u003Ehttps:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ELava flows: lava on the floor of Halema\u02bbuma\u02bbu crater and the southwest side of Kaluapele, K\u012blauea's summit caldera, remains hot and may slowly move in the days immediately following an eruptive episode.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EOther significant hazards exist around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes. Close to the eruptive vents, the tephra material on the crater rim is prone to cracking, slumping, and small landslides that sometimes expose hot and molten material within. This underscores the extremely hazardous nature of\u202fK\u012blauea's caldera rim surrounding Halema\u02bbuma\u02bbu\u202fcrater, an area that has been closed to the public since late 2007.\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":"2026-04-11","obs":"hvo","noticeId":"DOI-USGS-HVO-2026-04-11T16:52:59+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-HVO-2026-04-11T16:52:59+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-HVO-2026-04-11T16:52:59+00:00","obsAlertLevel":"ADVISORY","obsColorCode":"YELLOW","noticeHighestAlertLevel":"ADVISORY","noticeHighestColorCode":"YELLOW","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\u003ESaturday, April 11, 2026, 7:25 AM HST (Saturday, April 11, 2026, 17:25 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: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EOverview:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe Halema\u02bbuma\u02bbu eruption of K\u012blauea is paused. The south vent has continued to glow over the past day, and incandescence remains visible on the crater floor as lava flows from episode 44 continue to cool and solidify. Lava fountaining episode 44 ended at 7:41 p.m. HST on April 9.\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\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ENOTES: \u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EAt the time episode 44 ended, K\u012blauea's Volcano Alert Level was dropped to ADVISORY and its Aviation Color Code was dropped to YELLOW. This is a new procedure that has been adopted due to the lower ground and aviation hazards during eruptive pauses, between episodes.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EAn Information Statement on the new Volcano Alert Level and Aviation Color Code procedures can be found here: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-03T03:32:24+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-03T03:32:24+00:00\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EA Volcano Watch article on the new Volcano Alert Level and Aviation Color Code procedures can be found here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-adapting-evolving-eruption-revising-kilaueas-alert-level-and\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-adapting-evolving-eruption-revising-kilaueas-alert-level-and\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003ESignificant changes in activity between Daily Updates are posted here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThick steaming was observed yesterday in Halema\u02bbuma\u02bbu as heavy rains poured onto still-hot lava flows from episode 44, which stopped lava fountaining at 7:41 p.m. HST on April 9. Overnight, glow was visible from the south vent; both vents are now quiet and emitting plumes of gas. Lava flows on the crater floor have remained partially incandescent, and spatter emplaced near the north vent has continued to slowly creep downslope into the crater. Incandescence on the crater floor and slumping around the vent will likely continue for several more days.\u003C\/p\u003E\u003Cp\u003ESeismic tremor continues during the current pause, with bursts every 1\u201310 minutes likely associated with gas pistoning cycles in the eruptive vents.\u003C\/p\u003E\u003Cp\u003ESince the end of lava fountaining episode 44 on April 9, the U\u0113kahuna tiltmeter (UWD) has tracked approximately 4.5 microradians of inflationary tilt. This instrument recorded 17.6 microradians of deflation in total during the episode.\u003C\/p\u003E\u003Cp\u003EWith the eruption now paused, the sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rate from Halema\u02bbuma\u02bbu is likely now varying within a typical range of 1,000 to 5,000 tonnes per day. Winds near the eruptive vents were gusty out of the southwest yesterday, but they transitioned to more variable directions early this morning.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERift Zone Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ERates of seismicity and ground deformation remain low in the East Rift Zone and Southwest Rift Zone. SO\u003Csub\u003E2\u003C\/sub\u003E emissions from the East Rift Zone remain below the detection limit.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis\u003C\/strong\u003E:\u003C\/p\u003E\u003Cp\u003EThe rapid return of inflationary tilt and strong glow from both Halema\u02bbuma\u02bbu eruptive vents indicates that another lava fountaining episode is likely. At this time, there is not enough information to develop a detailed forecast window for the next episode.\u003C\/p\u003E\u003Cp\u003EK\u012blauea has been erupting episodically since December 23, 2024, from two vents (north and south) in Halema\u2018uma\u2018u. Lava fountaining episodes, which generally last for less than 12 hours, are separated by pauses that can be longer than three weeks.\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 \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecap of episode 44:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EEpisode 44 ended at 7:41 p.m. HST on April 9 after 8.5 hours of continuous lava fountaining from the north vent, sending tephra to the north into public areas of Hawai'i Volcanoes National Park and into surrounding communities. UWD tiltmeter recorded approximately 17.6 microradians of deflation during the episode.\u003C\/p\u003E\u003Cp\u003EA full summary of episode 44 can be found in a Status Report here: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-10T06:25:16+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-10T06:25:16+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EResources:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ENOTE: HVO\u2019s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations, including the SDH tiltmeter, will remain offline until we are able to re-establish access across the deep tephra field south of the caldera.\u003C\/p\u003E\u003Cp\u003EThe following links provide more information about the current eruption that began on December 23, 2024:\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\u003EShort messages tracking the evolution of the lava fountains and eruptive activity can be found here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EThree K\u012blauea summit livestream cameras 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=\u0022 https:\/\/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 pistons: \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 \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.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EVolcanic Gas: 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 continually released during an eruption. Emissions can remain locally hazardous in the areas immediately downwind of the vents, even when the vents are not actively erupting. SO\u003Csub\u003E2\u003C\/sub\u003E\u202freacts in the atmosphere to create vog (volcanic air pollution) downwind. SO\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\/li\u003E\u003Cli\u003ETephra: small glassy volcanic fragments\u2014volcanic ash, pumice, scoria, Pele\u2019s hair and reticulite\u2014are created by the lava fountains. A combination of fountaining dynamics and wind conditions determines where tephra fall may occur for any given eruption episode. Larger particles fall near the vents while light particles may be wafted greater distances. These particles may be remobilized during windy conditions following recent eruptive episodes. Residents and visitors should minimize exposure to these fragments, which can cause skin, eye, and respiratory irritation. More information and guidance on tephra fall hazards is available at \u003Ca href=\u0022https:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u0022\u003Ehttps:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ELava flows: lava on the floor of Halema\u02bbuma\u02bbu crater and the southwest side of Kaluapele, K\u012blauea's summit caldera, remains hot and may slowly move in the days immediately following an eruptive episode.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EOther significant hazards exist around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes. Close to the eruptive vents, the tephra material on the crater rim is prone to cracking, slumping, and small landslides that sometimes expose hot and molten material within. This underscores the extremely hazardous nature of\u202fK\u012blauea's caldera rim surrounding Halema\u02bbuma\u02bbu\u202fcrater, an area that has been closed to the public since late 2007.\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\u003EOverview:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe Halema\u02bbuma\u02bbu eruption of K\u012blauea is paused. The south vent has continued to glow over the past day, and incandescence remains visible on the crater floor as lava flows from episode 44 continue to cool and solidify. Lava fountaining episode 44 ended at 7:41 p.m. HST on April 9.\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\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ENOTES: \u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EAt the time episode 44 ended, K\u012blauea's Volcano Alert Level was dropped to ADVISORY and its Aviation Color Code was dropped to YELLOW. This is a new procedure that has been adopted due to the lower ground and aviation hazards during eruptive pauses, between episodes.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EAn Information Statement on the new Volcano Alert Level and Aviation Color Code procedures can be found here: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-03T03:32:24+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-03T03:32:24+00:00\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EA Volcano Watch article on the new Volcano Alert Level and Aviation Color Code procedures can be found here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-adapting-evolving-eruption-revising-kilaueas-alert-level-and\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-adapting-evolving-eruption-revising-kilaueas-alert-level-and\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003ESignificant changes in activity between Daily Updates are posted here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThick steaming was observed yesterday in Halema\u02bbuma\u02bbu as heavy rains poured onto still-hot lava flows from episode 44, which stopped lava fountaining at 7:41 p.m. HST on April 9. Overnight, glow was visible from the south vent; both vents are now quiet and emitting plumes of gas. Lava flows on the crater floor have remained partially incandescent, and spatter emplaced near the north vent has continued to slowly creep downslope into the crater. Incandescence on the crater floor and slumping around the vent will likely continue for several more days.\u003C\/p\u003E\u003Cp\u003ESeismic tremor continues during the current pause, with bursts every 1\u201310 minutes likely associated with gas pistoning cycles in the eruptive vents.\u003C\/p\u003E\u003Cp\u003ESince the end of lava fountaining episode 44 on April 9, the U\u0113kahuna tiltmeter (UWD) has tracked approximately 4.5 microradians of inflationary tilt. This instrument recorded 17.6 microradians of deflation in total during the episode.\u003C\/p\u003E\u003Cp\u003EWith the eruption now paused, the sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rate from Halema\u02bbuma\u02bbu is likely now varying within a typical range of 1,000 to 5,000 tonnes per day. Winds near the eruptive vents were gusty out of the southwest yesterday, but they transitioned to more variable directions early this morning.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERift Zone Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ERates of seismicity and ground deformation remain low in the East Rift Zone and Southwest Rift Zone. SO\u003Csub\u003E2\u003C\/sub\u003E emissions from the East Rift Zone remain below the detection limit.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis\u003C\/strong\u003E:\u003C\/p\u003E\u003Cp\u003EThe rapid return of inflationary tilt and strong glow from both Halema\u02bbuma\u02bbu eruptive vents indicates that another lava fountaining episode is likely. At this time, there is not enough information to develop a detailed forecast window for the next episode.\u003C\/p\u003E\u003Cp\u003EK\u012blauea has been erupting episodically since December 23, 2024, from two vents (north and south) in Halema\u2018uma\u2018u. Lava fountaining episodes, which generally last for less than 12 hours, are separated by pauses that can be longer than three weeks.\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 \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecap of episode 44:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EEpisode 44 ended at 7:41 p.m. HST on April 9 after 8.5 hours of continuous lava fountaining from the north vent, sending tephra to the north into public areas of Hawai'i Volcanoes National Park and into surrounding communities. UWD tiltmeter recorded approximately 17.6 microradians of deflation during the episode.\u003C\/p\u003E\u003Cp\u003EA full summary of episode 44 can be found in a Status Report here: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-10T06:25:16+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-04-10T06:25:16+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EResources:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ENOTE: HVO\u2019s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations, including the SDH tiltmeter, will remain offline until we are able to re-establish access across the deep tephra field south of the caldera.\u003C\/p\u003E\u003Cp\u003EThe following links provide more information about the current eruption that began on December 23, 2024:\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\u003EShort messages tracking the evolution of the lava fountains and eruptive activity can be found here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EThree K\u012blauea summit livestream cameras 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=\u0022 https:\/\/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 pistons: \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 \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.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EVolcanic Gas: 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 continually released during an eruption. Emissions can remain locally hazardous in the areas immediately downwind of the vents, even when the vents are not actively erupting. SO\u003Csub\u003E2\u003C\/sub\u003E\u202freacts in the atmosphere to create vog (volcanic air pollution) downwind. SO\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\/li\u003E\u003Cli\u003ETephra: small glassy volcanic fragments\u2014volcanic ash, pumice, scoria, Pele\u2019s hair and reticulite\u2014are created by the lava fountains. A combination of fountaining dynamics and wind conditions determines where tephra fall may occur for any given eruption episode. Larger particles fall near the vents while light particles may be wafted greater distances. These particles may be remobilized during windy conditions following recent eruptive episodes. Residents and visitors should minimize exposure to these fragments, which can cause skin, eye, and respiratory irritation. More information and guidance on tephra fall hazards is available at \u003Ca href=\u0022https:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u0022\u003Ehttps:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ELava flows: lava on the floor of Halema\u02bbuma\u02bbu crater and the southwest side of Kaluapele, K\u012blauea's summit caldera, remains hot and may slowly move in the days immediately following an eruptive episode.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EOther significant hazards exist around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes. Close to the eruptive vents, the tephra material on the crater rim is prone to cracking, slumping, and small landslides that sometimes expose hot and molten material within. This underscores the extremely hazardous nature of\u202fK\u012blauea's caldera rim surrounding Halema\u02bbuma\u02bbu\u202fcrater, an area that has been closed to the public since late 2007.\u003C\/p\u003E","synopsis":"HVO Kilauea YELLOW\/ADVISORY - The Halema\u02bbuma\u02bbu eruption remains paused. Continued south vent and crater floor incandescence following lava fountaining episode 44, which ended April 9.","alertLevel":"ADVISORY","colorCode":"YELLOW","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-2026-04-11T16:53:04+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, April 10, 2026, 5:57 AM ChST (Thursday, April 9, 2026, 19:57 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\u003Cb\u003EAHYI SEAMOUNT\u003C\/b\u003E (VNUM #284141)\u003Cbr\/\u003E20\u00b026'13\u0022 N 145\u00b01'48\u0022 E, Summit Elevation -180 ft (-55 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: UNASSIGNED\u003Cbr\/\u003ECurrent Aviation Color Code: UNASSIGNED\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EOn April 8, 2026, high-resolution satellite imagery revealed a plume of discolored water near Ahyi Seamount, stretching approximately 300 to 400 meters (985 to 1,300 feet) across the surface. No signs of volcanic activity or unrest were detected in data from remote underwater pressure sensors, nor were there any other indicators suggesting significant unrest. The last time a similar plume was visible in satellite imagery was on January 9, 2026; however, persistent cloud cover and limited availability of high-quality satellite images have made it challenging to monitor such occurrences consistently.\u003C\/p\u003E\u003Cp\u003EThere are no local monitoring stations near Ahyi seamount, which limits our ability to detect and characterize volcanic unrest there. We will continue to monitor satellite and distal hydroacoustic data for additional evidence for, or escalation of, volcanic activity.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EAhyi seamount is a large conical submarine volcano that rises to within 180 feet (55 m) of the sea surface about 11 miles (18 km) southeast of the island of Farallon de Pajaros (Uracas) in the Northern Mariana Islands. Water discoloration has been observed over the submarine volcano during previous periods of activity, and in 1979 the crew of a fishing boat felt shocks over the summit area followed by upwelling of sulfur-bearing water. From April 24 to 25, 2001, an explosive submarine eruption was detected seismically from a seismic station on Rangiroa Atoll, Tuamotu Archipelago. The event was well constrained (+\/- 9 miles or 15 km) at a location near the southern base of Ahyi; the summit of the seamount lies within the location uncertainty. Another eruption was detected from April 24 to May 17, 2014, using data from seismometers located on subaerial volcanoes in the Northern Mariana Islands and hydrophone arrays at Wake Island. NOAA divers also reported hearing explosions while conducting coral reef research on nearby Farallon de Pajaros. The 2014 eruption of Ahyi formed a new crater near the summit of the volcano and a large landslide chute developed on its southeast flank. More recently, the volcano erupted from October 2022 to May 2023 and again from December 2023 to April 2024, characterized by submarine plumes and geophysical detections of activity on the hydrophone arrays at Wake Island. The current episode of unrest began in August 2024.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003ENORTHERN MARIANAS VOLCANOES\u003C\/strong\u003E\u003Cbr\u003ENo definitive signs of unrest were detected at any other 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, the following volcanoes have alert levels of UNASSIGNED: 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":"2026-04-09","obs":"nmi","noticeId":"DOI-USGS-NMI-2026-04-09T19:36:26+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-NMI-2026-04-09T19:36:26+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-NMI-2026-04-09T19:36:26+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, April 10, 2026, 5:57 AM ChST (Thursday, April 9, 2026, 19:57 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 definitive signs of unrest were detected at any other 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, the following volcanoes have alert levels of UNASSIGNED: Anatahan, Sarigan, Farallon de Pajaros, Supply Reef, Maug, Asuncion, Agrigan, Pagan, Almagan, and Guguan.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003EThis notice contains volcanoes not displayed here:\u003C\/b\u003E Ahyi Seamount (UNASSIGNED\/UNASSIGNED).\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 definitive signs of unrest were detected at any other 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, the following volcanoes have alert levels of UNASSIGNED: Anatahan, Sarigan, Farallon de Pajaros, Supply Reef, Maug, Asuncion, Agrigan, Pagan, Almagan, and Guguan.\u003C\/p\u003E","synopsis":"NMI - No clear signs of unrest were detected at any 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-2026-04-09T19:36:26+00:00"},{"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, April 10, 2026, 5:57 AM ChST (Thursday, April 9, 2026, 19:57 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\u003Cb\u003EAHYI SEAMOUNT\u003C\/b\u003E (VNUM #284141)\u003Cbr\/\u003E20\u00b026'13\u0022 N 145\u00b01'48\u0022 E, Summit Elevation -180 ft (-55 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: UNASSIGNED\u003Cbr\/\u003ECurrent Aviation Color Code: UNASSIGNED\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EOn April 8, 2026, high-resolution satellite imagery revealed a plume of discolored water near Ahyi Seamount, stretching approximately 300 to 400 meters (985 to 1,300 feet) across the surface. No signs of volcanic activity or unrest were detected in data from remote underwater pressure sensors, nor were there any other indicators suggesting significant unrest. The last time a similar plume was visible in satellite imagery was on January 9, 2026; however, persistent cloud cover and limited availability of high-quality satellite images have made it challenging to monitor such occurrences consistently.\u003C\/p\u003E\u003Cp\u003EThere are no local monitoring stations near Ahyi seamount, which limits our ability to detect and characterize volcanic unrest there. We will continue to monitor satellite and distal hydroacoustic data for additional evidence for, or escalation of, volcanic activity.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EAhyi seamount is a large conical submarine volcano that rises to within 180 feet (55 m) of the sea surface about 11 miles (18 km) southeast of the island of Farallon de Pajaros (Uracas) in the Northern Mariana Islands. Water discoloration has been observed over the submarine volcano during previous periods of activity, and in 1979 the crew of a fishing boat felt shocks over the summit area followed by upwelling of sulfur-bearing water. From April 24 to 25, 2001, an explosive submarine eruption was detected seismically from a seismic station on Rangiroa Atoll, Tuamotu Archipelago. The event was well constrained (+\/- 9 miles or 15 km) at a location near the southern base of Ahyi; the summit of the seamount lies within the location uncertainty. Another eruption was detected from April 24 to May 17, 2014, using data from seismometers located on subaerial volcanoes in the Northern Mariana Islands and hydrophone arrays at Wake Island. NOAA divers also reported hearing explosions while conducting coral reef research on nearby Farallon de Pajaros. The 2014 eruption of Ahyi formed a new crater near the summit of the volcano and a large landslide chute developed on its southeast flank. More recently, the volcano erupted from October 2022 to May 2023 and again from December 2023 to April 2024, characterized by submarine plumes and geophysical detections of activity on the hydrophone arrays at Wake Island. The current episode of unrest began in August 2024.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003ENORTHERN MARIANAS VOLCANOES\u003C\/strong\u003E\u003Cbr\u003ENo definitive signs of unrest were detected at any other 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, the following volcanoes have alert levels of UNASSIGNED: 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\u003EOn April 8, 2026, high-resolution satellite imagery revealed a plume of discolored water near Ahyi Seamount, stretching approximately 300 to 400 meters (985 to 1,300 feet) across the surface. No signs of volcanic activity or unrest were detected in data from remote underwater pressure sensors, nor were there any other indicators suggesting significant unrest. The last time a similar plume was visible in satellite imagery was on January 9, 2026; however, persistent cloud cover and limited availability of high-quality satellite images have made it challenging to monitor such occurrences consistently.\u003C\/p\u003E\u003Cp\u003EThere are no local monitoring stations near Ahyi seamount, which limits our ability to detect and characterize volcanic unrest there. We will continue to monitor satellite and distal hydroacoustic data for additional evidence for, or escalation of, volcanic activity.\u003C\/p\u003E","synopsis":"NMI Ahyi Seamount UNASSIGNED\/UNASSIGNED - Plume of discolored water observed in satellite image this week.","alertLevel":"UNASSIGNED","colorCode":"UNASSIGNED","vName":"Ahyi Seamount","vnum":"284141","lat":20.437,"lng":145.03,"vUrl":"https:\/\/www.usgs.gov\/volcanoes\/ahyi-seamount","vImage":"https:\/\/volcanoes.usgs.gov\/vsc\/images\/ahyi\/ahyi-home.jpg","region":"Northern Mariana Islands","sectionId":"DOI-USGS-NMI-2026-04-09T19:36:48+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\u003EWednesday, April 1, 2026, 10:30 AM MDT (Wednesday, April 1, 2026, 16:30 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 61 located earthquakes in March (largest = M1.9). Deformation measurements indicate a pause in the uplift that had been occurring along the north caldera rim since July 2025.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EEchinus Geyser, in Norris Geyser Basin, reawakened from a several-year slumber in February, with about 40 eruptions that month, but the geyser had only one eruption in March.  An eruption was detected by acoustic, seismic, and temperature measurements at Black Diamond Pool in Biscuit Basin (site of a hydrothermal explosion in 2024) on March 9 at 1:27 a.m. MDT.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring March 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 61 earthquakes in the Yellowstone National Park region. The largest event of the month was a microearthquake of magnitude 1.9 located about 5 miles north of West Yellowstone, Montana, on March 15 at 5:14 a.m. MDT.\u003C\/p\u003E\u003Cp\u003EMarch seismicity in Yellowstone was marked by a swarm of 10 earthquakes that occurred approximately 5 miles north of West Yellowstone, Montana, on March 15. The largest earthquake in the sequence was also the largest in March (described above).\u003C\/p\u003E\u003Cp\u003EEarthquake activity in Yellowstone is 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 indicate that the uplift that started in July 2025 on the north caldera rim ceased by mid-January 2026.  In Yellowstone Caldera, continuous GPS data recorded little net change since December, although results are ambiguous due to the impacts of winter weather conditions on GPS data.\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":"2026-04-01","obs":"yvo","noticeId":"DOI-USGS-YVO-2026-04-01T16:26:51+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-YVO-2026-04-01T16:26:51+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-YVO-2026-04-01T16:26:51+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\u003EWednesday, April 1, 2026, 10:30 AM MDT (Wednesday, April 1, 2026, 16:30 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 61 located earthquakes in March (largest = M1.9). Deformation measurements indicate a pause in the uplift that had been occurring along the north caldera rim since July 2025.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EEchinus Geyser, in Norris Geyser Basin, reawakened from a several-year slumber in February, with about 40 eruptions that month, but the geyser had only one eruption in March.  An eruption was detected by acoustic, seismic, and temperature measurements at Black Diamond Pool in Biscuit Basin (site of a hydrothermal explosion in 2024) on March 9 at 1:27 a.m. MDT.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring March 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 61 earthquakes in the Yellowstone National Park region. The largest event of the month was a microearthquake of magnitude 1.9 located about 5 miles north of West Yellowstone, Montana, on March 15 at 5:14 a.m. MDT.\u003C\/p\u003E\u003Cp\u003EMarch seismicity in Yellowstone was marked by a swarm of 10 earthquakes that occurred approximately 5 miles north of West Yellowstone, Montana, on March 15. The largest earthquake in the sequence was also the largest in March (described above).\u003C\/p\u003E\u003Cp\u003EEarthquake activity in Yellowstone is 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 indicate that the uplift that started in July 2025 on the north caldera rim ceased by mid-January 2026.  In Yellowstone Caldera, continuous GPS data recorded little net change since December, although results are ambiguous due to the impacts of winter weather conditions on GPS data.\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 61 located earthquakes in March (largest = M1.9). Deformation measurements indicate a pause in the uplift that had been occurring along the north caldera rim since July 2025.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EEchinus Geyser, in Norris Geyser Basin, reawakened from a several-year slumber in February, with about 40 eruptions that month, but the geyser had only one eruption in March.  An eruption was detected by acoustic, seismic, and temperature measurements at Black Diamond Pool in Biscuit Basin (site of a hydrothermal explosion in 2024) on March 9 at 1:27 a.m. MDT.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring March 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 61 earthquakes in the Yellowstone National Park region. The largest event of the month was a microearthquake of magnitude 1.9 located about 5 miles north of West Yellowstone, Montana, on March 15 at 5:14 a.m. MDT.\u003C\/p\u003E\u003Cp\u003EMarch seismicity in Yellowstone was marked by a swarm of 10 earthquakes that occurred approximately 5 miles north of West Yellowstone, Montana, on March 15. The largest earthquake in the sequence was also the largest in March (described above).\u003C\/p\u003E\u003Cp\u003EEarthquake activity in Yellowstone is 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 indicate that the uplift that started in July 2025 on the north caldera rim ceased by mid-January 2026.  In Yellowstone Caldera, continuous GPS data recorded little net change since December, although results are ambiguous due to the impacts of winter weather conditions on GPS data.\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-2026-04-01T16:26:51+00:00"}]}]