[{"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\u003ESunday, October 4, 2026, 11:18 AM AKDT (Sunday, October 4, 2026, 19:18 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EGARELOI\u003C\/b\u003E (VNUM #311070)\u003Cbr\/\u003E51\u00b047'21\u0022 N 178\u00b047'46\u0022 W, Summit Elevation 5161 ft (1573 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E No above background activity observed over the past day.\u003Cbr \/\u003E\r\n\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ENo additional signs of unrest have been detected following the short\u2011duration explosion on October 1. Over the past day, wind noise has limited detection of seismic and infrasound signals, and cloud cover has obscured satellite views of the volcano.\u003C\/p\u003E\u003Cp\u003EGareloi volcano persistently emits magmatic gases from a fumarole field on the south crater and commonly exhibits low-level seismic activity. These observations suggest the presence of shallow magma and potential interaction with a hydrothermal system. This October 1 explosion likely reflects a change to the magmatic-hydrothermal system, but it is not clear that the likelihood of a volcanic eruption has increased. AVO will continue to monitor activity to determine if the recent changes are related to influx of new magma or other changes to the magma system.\u003C\/p\u003E\u003Cp\u003EMount Gareloi is monitored by a local seismic and infrasound network, satellite data, and regional infrasound and lightning-detection networks.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\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=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E Slow eruption of lava within the summit crater continues.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ELava continues to erupt slowly within the summit crater of Great Sitkin Volcano. Minor earthquakes were detected in the past day. Cloud cover has obscured views of the volcano by satellite and webcam.\u003C\/p\u003E\u003Cp\u003EThe current eruption began in July 2021. Since then, lava flows have 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 Volcano: \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\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=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E Low-level unrest continues.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ESlightly elevated seismic and infrasound activity continues, and minor sulfur dioxide emissions were detected in satellite data over the past day. Cloud cover has obscured views of the volcano by satellite and webcam.\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 Volcano: \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\u003EMatt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497\u003C\/p\u003E\u003Cp\u003EDavid Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 378-5460\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EContact AVO: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/contact\u0022\u003Ehttps:\/\/avo.alaska.edu\/contact\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EThe Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.\u003C\/p\u003E","sentUtc":"2026-10-04","obs":"avo","noticeId":"DOI-USGS-AVO-2026-10-04T19:06:29+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-AVO-2026-10-04T19:06:29+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-AVO-2026-10-04T19:06:29+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\u003ESunday, October 4, 2026, 11:18 AM AKDT (Sunday, October 4, 2026, 19:18 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EGARELOI\u003C\/b\u003E (VNUM #311070)\u003Cbr\/\u003E51\u00b047'21\u0022 N 178\u00b047'46\u0022 W, Summit Elevation 5161 ft (1573 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E No above background activity observed over the past day.\u003Cbr \/\u003E\r\n\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ENo additional signs of unrest have been detected following the short\u2011duration explosion on October 1. Over the past day, wind noise has limited detection of seismic and infrasound signals, and cloud cover has obscured satellite views of the volcano.\u003C\/p\u003E\u003Cp\u003EGareloi volcano persistently emits magmatic gases from a fumarole field on the south crater and commonly exhibits low-level seismic activity. These observations suggest the presence of shallow magma and potential interaction with a hydrothermal system. This October 1 explosion likely reflects a change to the magmatic-hydrothermal system, but it is not clear that the likelihood of a volcanic eruption has increased. AVO will continue to monitor activity to determine if the recent changes are related to influx of new magma or other changes to the magma system.\u003C\/p\u003E\u003Cp\u003EMount Gareloi is monitored by a local seismic and infrasound network, satellite data, and regional infrasound and lightning-detection networks.\u003C\/p\u003E\u003C\/span\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\u003EMatt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497\u003C\/p\u003E\u003Cp\u003EDavid Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 378-5460\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EContact AVO: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/contact\u0022\u003Ehttps:\/\/avo.alaska.edu\/contact\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EThe Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.\u003C\/p\u003E","summary":"\u003Cp\u003ENo additional signs of unrest have been detected following the short\u2011duration explosion on October 1. Over the past day, wind noise has limited detection of seismic and infrasound signals, and cloud cover has obscured satellite views of the volcano.\u003C\/p\u003E\u003Cp\u003EGareloi volcano persistently emits magmatic gases from a fumarole field on the south crater and commonly exhibits low-level seismic activity. These observations suggest the presence of shallow magma and potential interaction with a hydrothermal system. This October 1 explosion likely reflects a change to the magmatic-hydrothermal system, but it is not clear that the likelihood of a volcanic eruption has increased. AVO will continue to monitor activity to determine if the recent changes are related to influx of new magma or other changes to the magma system.\u003C\/p\u003E\u003Cp\u003EMount Gareloi is monitored by a local seismic and infrasound network, satellite data, and regional infrasound and lightning-detection networks.\u003C\/p\u003E","synopsis":"AVO Gareloi YELLOW\/ADVISORY - No above background activity observed over the past day.","alertLevel":"ADVISORY","colorCode":"YELLOW","vName":"Gareloi","vnum":"311070","lat":51.7892,"lng":-178.796,"vUrl":"https:\/\/avo.alaska.edu\/activity\/Gareloi.php","vImage":"https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1109362225_15_3.jpg","region":"Aleutians","sectionId":"DOI-USGS-AVO-2026-10-04T19:06:31+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\u003ESunday, October 4, 2026, 11:18 AM AKDT (Sunday, October 4, 2026, 19:18 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=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E Slow eruption of lava within the summit crater continues.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ELava continues to erupt slowly within the summit crater of Great Sitkin Volcano. Minor earthquakes were detected in the past day. Cloud cover has obscured views of the volcano by satellite and webcam.\u003C\/p\u003E\u003Cp\u003EThe current eruption began in July 2021. Since then, lava flows have 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 Volcano: \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 Gareloi (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\u003EMatt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497\u003C\/p\u003E\u003Cp\u003EDavid Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 378-5460\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EContact AVO: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/contact\u0022\u003Ehttps:\/\/avo.alaska.edu\/contact\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EThe Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.\u003C\/p\u003E","summary":"\u003Cp\u003ELava continues to erupt slowly within the summit crater of Great Sitkin Volcano. Minor earthquakes were detected in the past day. Cloud cover has obscured views of the volcano by satellite and webcam.\u003C\/p\u003E\u003Cp\u003EThe current eruption began in July 2021. Since then, lava flows have 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-2026-10-04T19:06:29+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\u003ESunday, October 4, 2026, 11:18 AM AKDT (Sunday, October 4, 2026, 19:18 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=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E Low-level unrest continues.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ESlightly elevated seismic and infrasound activity continues, and minor sulfur dioxide emissions were detected in satellite data over the past day. Cloud cover has obscured views of the volcano by satellite and webcam.\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 Volcano: \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 Gareloi (ADVISORY\/YELLOW), Great Sitkin (WATCH\/ORANGE).\u003Cbr\/\u003E\u003Cbr\/\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003EMatt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497\u003C\/p\u003E\u003Cp\u003EDavid Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 378-5460\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EContact AVO: \u003Ca href=\u0022https:\/\/avo.alaska.edu\/contact\u0022\u003Ehttps:\/\/avo.alaska.edu\/contact\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EThe Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.\u003C\/p\u003E","summary":"\u003Cp\u003ESlightly elevated seismic and infrasound activity continues, and minor sulfur dioxide emissions were detected in satellite data over the past day. Cloud cover has obscured views of the volcano by satellite and webcam.\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.","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-2026-10-04T19:06:30+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, September 29, 2026, 11:09 AM PDT (Tuesday, September 29, 2026, 18:09 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003ECalifornia Volcano Observatory Volcano Observatory\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E CA volcanoes were at normal background levels of seismicity and deformation during the past week.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EMonitored CALIFORNIA VOLCANOES\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Volcano Alert Level: all NORMAL\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Aviation Color Code: all GREEN\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EActivity Update: \u003C\/strong\u003EAll volcanoes monitored by CalVO show normal background earthquake activity and deformation. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for September 21 (0000h PDT) to September 27 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 87 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.2.\u003Cbr\u003E\u003Cbr\u003EFive earthquakes greater than M1 were recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with the largest having a magnitude of M2.7.\u003Cbr\u003E\u003Cbr\u003EFour earthquakes greater than M1 were recorded near the Salton Buttes, with the largest having a magnitude of M1.3.\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.\u003Cbr\u003E \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":"2026-09-29","obs":"calvo","noticeId":"DOI-USGS-CALVO-2026-09-29T17:10:10+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-CALVO-2026-09-29T17:10:10+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-CALVO-2026-09-29T17:10:10+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, September 29, 2026, 11:09 AM PDT (Tuesday, September 29, 2026, 18:09 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003ECalifornia Volcano Observatory Volcano Observatory\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E CA volcanoes were at normal background levels of seismicity and deformation during the past week.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EMonitored CALIFORNIA VOLCANOES\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Volcano Alert Level: all NORMAL\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Aviation Color Code: all GREEN\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EActivity Update: \u003C\/strong\u003EAll volcanoes monitored by CalVO show normal background earthquake activity and deformation. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for September 21 (0000h PDT) to September 27 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 87 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.2.\u003Cbr\u003E\u003Cbr\u003EFive earthquakes greater than M1 were recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with the largest having a magnitude of M2.7.\u003Cbr\u003E\u003Cbr\u003EFour earthquakes greater than M1 were recorded near the Salton Buttes, with the largest having a magnitude of M1.3.\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.\u003Cbr\u003E \u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThese earthquake counts are preliminary and subject to change as the earthquakes are reviewed by seismologists. The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u003C\/a\u003E. \u003Cbr\u003E\u003Cbr\u003EAs part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory monitors the volcanoes of California and Nevada and advances scientific understanding of volcanic processes in order to reduce the harmful impacts of volcanic activity. For additional USGS CalVO volcano information, background, images, and other graphics visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/calvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/calvo\u003C\/a\u003E. For general information on the USGS Volcano Hazard Program visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u0022\u003Ehttps:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u003C\/a\u003E. Statewide seismic information for California and Nevada can be found at \u003Ca href=\u0022https:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u0022\u003Ehttps:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u003C\/a\u003E.\u003Cbr\u003E\u003Cbr\u003E \u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022mailto:askCalVO@usgs.gov\u0022\u003EaskCalVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E","summary":"\u003Cp\u003E\u003Cstrong\u003EMonitored CALIFORNIA VOLCANOES\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Volcano Alert Level: all NORMAL\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Aviation Color Code: all GREEN\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EActivity Update: \u003C\/strong\u003EAll volcanoes monitored by CalVO show normal background earthquake activity and deformation. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for September 21 (0000h PDT) to September 27 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 87 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.2.\u003Cbr\u003E\u003Cbr\u003EFive earthquakes greater than M1 were recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with the largest having a magnitude of M2.7.\u003Cbr\u003E\u003Cbr\u003EFour earthquakes greater than M1 were recorded near the Salton Buttes, with the largest having a magnitude of M1.3.\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-2026-09-29T17:10:10+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, October 2, 2026, 11:58 AM PDT (Friday, October 2, 2026, 18:58 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=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E All volcanoes are at normal levels.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EActivity Update\u003C\/strong\u003E: All volcanoes in the Cascade Range of Washington and Oregon 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: Over the past week, small earthquakes were detected at Mount Hood, Mount Rainier, Mount Adams, and Mount St. Helens. At Mount Adams, the Pacific Northwest Seismic Network located 10 events ranging from M0.8 to M2.6 on September 27-28, all too small to be felt at the surface.  Seismicity over the past year continues a trend of slightly elevated earthquake activity at Mount Adams that began in fall 2024. Although this represents an increase in rate of seismicity for Mount Adams, the rate remains substantially lower than earthquake rates at its three closest volcanic neighbors: Mount St. Helens, Mount Hood, and Mount Rainier; and all monitoring data remain consistent with background activity levels throughout the Cascade Range. Field work included routine maintenance of monitoring stations at Mount Hood, and a rapid-response field-site repair to restore network connectivity to several Rainier Lahar Detection System stations.\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, Acting Scientist-in-Charge, Cascades Volcano Observatory, \u003Ca href=\u0022mailto:jjmajor@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":"2026-10-02","obs":"cvo","noticeId":"DOI-USGS-CVO-2026-10-02T18:31:03+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-CVO-2026-10-02T18:31:03+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-CVO-2026-10-02T18:31:03+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, October 2, 2026, 11:58 AM PDT (Friday, October 2, 2026, 18:58 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=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E All volcanoes are at normal levels.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EActivity Update\u003C\/strong\u003E: All volcanoes in the Cascade Range of Washington and Oregon 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: Over the past week, small earthquakes were detected at Mount Hood, Mount Rainier, Mount Adams, and Mount St. Helens. At Mount Adams, the Pacific Northwest Seismic Network located 10 events ranging from M0.8 to M2.6 on September 27-28, all too small to be felt at the surface.  Seismicity over the past year continues a trend of slightly elevated earthquake activity at Mount Adams that began in fall 2024. Although this represents an increase in rate of seismicity for Mount Adams, the rate remains substantially lower than earthquake rates at its three closest volcanic neighbors: Mount St. Helens, Mount Hood, and Mount Rainier; and all monitoring data remain consistent with background activity levels throughout the Cascade Range. Field work included routine maintenance of monitoring stations at Mount Hood, and a rapid-response field-site repair to restore network connectivity to several Rainier Lahar Detection System stations.\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, Acting Scientist-in-Charge, Cascades Volcano Observatory, \u003Ca href=\u0022mailto:jjmajor@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 Washington and Oregon 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: Over the past week, small earthquakes were detected at Mount Hood, Mount Rainier, Mount Adams, and Mount St. Helens. At Mount Adams, the Pacific Northwest Seismic Network located 10 events ranging from M0.8 to M2.6 on September 27-28, all too small to be felt at the surface.  Seismicity over the past year continues a trend of slightly elevated earthquake activity at Mount Adams that began in fall 2024. Although this represents an increase in rate of seismicity for Mount Adams, the rate remains substantially lower than earthquake rates at its three closest volcanic neighbors: Mount St. Helens, Mount Hood, and Mount Rainier; and all monitoring data remain consistent with background activity levels throughout the Cascade Range. Field work included routine maintenance of monitoring stations at Mount Hood, and a rapid-response field-site repair to restore network connectivity to several Rainier Lahar Detection System stations.\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-2026-10-02T18:31:03+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\u003ESunday, October 4, 2026, 8:30 AM HST (Sunday, October 4, 2026, 18:30 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EKILAUEA\u003C\/b\u003E (VNUM #332010)\u003Cbr\/\u003E19\u00b025'16\u0022 N 155\u00b017'13\u0022 W, Summit Elevation 4091 ft (1247 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: WATCH\u003Cbr\/\u003ECurrent Aviation Color Code: ORANGE\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E No overflows or spattering at north or south vents over the past day; strong glow and flames continue. No reactivation of Sept. 30\u2013Oct. 1 intrusion. Earthquake activity continues underneath Halema\u02bbuma\u02bbu. No anomalous activity outside the summit.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EOverview:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThere have been no overflows or spatter from north or vents in the past 24 hours, although there was strong glow and flames from the vents overnight. The summit intrusion that happened the night of September 30 to October 1 has not reactivated, although earthquake activity has continued underneath Halema\u02bbuma\u02bbu and summit tiltmeters recorded minor inflation.\u003C\/p\u003E\u003Cp\u003EEpisode 55 fountaining remains a possibility during the ongoing K\u012blauea summit eruption. It is also possible that intrusive activity below K\u012blauea summit caldera could resume and potentially lead to the eruption of lava in a new location within the caldera.\u003C\/p\u003E\u003Cp\u003ENo anomalous seismic activity or deformation has occurred outside of the summit region, and no significant activity has been noted along K\u012blauea\u2019s East Rift Zone or Southwest Rift Zone.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESTATUS REPORT published during intrusive activity:\u003C\/strong\u003E \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-10-01T08:14:21+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-10-01T08:14:21+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EVOLCANO WATCH summarizing recent intrusive activity: \u003C\/strong\u003E\u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-intrusion-during-eruption-summit-kilauea\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-intrusion-during-eruption-summit-kilauea\u003C\/a\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESTATUS REPORT on changes in activity and implications for this eruption: \u003C\/strong\u003E\u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-09-15T03:18:09+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-09-15T03:18:09+00:00\u003C\/a\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ENOTE: \u003C\/strong\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\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EIn the past 24 hours, there have been no overflows and no spattering. Both vents had strong glow with flaming overnight. No other areas of incandescence were observed across the summit region last night. An intrusion underneath Kaluapele, the K\u012blauea summit caldera, started the afternoon of September 30 and ended on October 1 at around 4 a.m. H.S.T. South vent only had one overflow after the intrusion, ending just before 6 a.m. on October 1, and north vent's last overflow was also on October 1, just after 6 a.m. H.S.T. \u003C\/p\u003E\u003Cp\u003EElevated rates of earthquakes below Kaluapele continue following the intrusion. In the past 24 hours, there were 9 shallow earthquakes located across the summit region, primarily underneath Halema\u02bbuma\u02bbu, and the U\u0113kahuna tiltmeter (UWD) recorded approximately 0.7 microradians of inflation.\u003C\/p\u003E\u003Cp\u003EDuring inter-episode pauses, the sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rate from the summit typically varies between 1,000 and 5,000 tonnes per day. Winds are currently forecast from the north northeast.\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. No significant ground deformation was recorded in either rift zone.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis\u003C\/strong\u003E:\u003C\/p\u003E\u003Cp\u003EMonitoring data indicate that a shallow intrusion occurred the afternoon of September 30 through to the morning of October 1 underneath Halema\u02bbuma\u02bbu. The intrusion did not reactive in the past 24 hours, although conditions can change rapidly, including eruption from a new vent with little or no seismicity or deformation.\u003C\/p\u003E\u003Cp\u003EIn the past 24 hours, there was no spattering or overflows at north or south vents. Forecast windows for a potential episode 55 can no longer be modeled due to the irregular changes in inflation and deflation. The north vent has produced the last 11 high fountain events (episodes 44\u201354). It is not possible to say with certainty that this activity will lead to the onset of another fountain event at this time, although conditions remain favorable.\u003C\/p\u003E\u003Cp\u003EBecause the summit system remains active and highly pressurized, the two most likely possibilities are that activity continues at the north-south-west vent complex, or it activates another existing weak crack system in the summit region. Neither of these events are likely to produce a strong seismic precursor, so the alert levels have been left at ORANGE\/WATCH as the volcano continues to \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/alert-level-system\u0022\u003E\u0022exhibit heightened unrest with an increased potential for eruption\u0022\u003C\/a\u003E. For further details about potential scenarios see the September 15 \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-09-15T03:18:09+00:00\u0022\u003EStatus Report\u003C\/a\u003E.\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 of two or more 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\u003ESummary of episode 54:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EA detailed account of episode 54 is given in the HVO Status Report issued on August 25: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-08-26T05:56:38+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-08-26T05:56:38+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEpisode 54 of the ongoing Halema\u02bbuma\u02bbu eruption began around 10:30 a.m. HST and ended at 7:33 p.m. HST on August 25, 2026, after 9 hours of continuous lava fountaining. \u003C\/li\u003E\u003Cli\u003EThe maximum lava fountain height from the north vent was approximately 500 feet (150 meters) above ground level, reached between 12:15 p.m. and 1:00 p.m. HST. Neither the south vent nor the new west vent (formerly the collapse pit) fountained during this episode.\u003C\/li\u003E\u003Cli\u003EThe maximum plume height was approximately 17,000 feet (5,200 meters) above sea level.\u003C\/li\u003E\u003Cli\u003EMost tephra fall was restricted to the closed area of Hawai\u02bbi Volcanoes National Park, southwest of the active eruptive vents in Halema\u02bbuma\u02bbu. However, HVO did also receive a report of trace Pele\u2019s hair falling in the Ka\u2018\u016b district of the Island of Hawai\u02bbi.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EResources:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ENOTE:\u003C\/strong\u003E HVO\u2019s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations will remain offline as we continue working to repair instruments and re-establish connections in our monitoring network.\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\u003EEruptive activity since December 2024 has been occurring within a closed area of Hawai'i Volcanoes National Park. However, this week's intrusion highlights that the location of eruptive activity could change. Intrusions can also be hazardous with potential to cause earthquakes, ground cracks, and small landslides. The primary hazards at Kilauea due to eruptive activity and\/or intrusions are:\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003E\u003Cstrong\u003EVolcanic Gas:\u003C\/strong\u003E 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\u003E\u003Cstrong\u003ETephra: \u003C\/strong\u003ESmall 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 and \u003Ca href=\u0022https:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u0022\u003Ehttps:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u003C\/a\u003E \u003C\/li\u003E\u003Cli\u003E\u003Cstrong\u003ELava flows: \u003C\/strong\u003EHawaiian lava flows generally advance slowly downslope but destroy everything in their paths. Lava flows that erupt within Halema\u02bbuma\u02bbu crater remain confined to Halema\u02bbuma\u02bbu and Kaluapele. Lava flows from the eruption that started in December 2024 have been confined to Halema\u02bbuma\u02bbu, an area closed to the public. Hazards associated with active or recent lava flows include hot and glassy (sharp) surfaces that can cause serious burns, abrasions, and lacerations upon contact with unprotected or exposed skin; uneven and rough terrain can lead to falls and other injuries; hot temperatures that can cause heat exhaustion or dehydration, or in heavy rain can produce steamy ground-fog that can be acidic, severely limiting visibility and sometimes causing difficulty breathing.\u003C\/li\u003E\u003Cli\u003E\u003Cstrong\u003EEarthquakes and ground cracks: \u003C\/strong\u003EShallow magma movement and eruptions can produce minor to severe ground fractures and subsidence features. These ground cracks can continue to widen and offset as magma migration continues, may have unstable overhanging edges, and should be avoided. Other significant hazards exist around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EAdditionally, 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\u003Cp\u003E \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\u003Cstrong\u003EMore Information:\u003C\/strong\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EK\u012blauea 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\u003Cli\u003EK\u012blauea activity summary also available by phone: \u003Ca href=\u0022tel:(808) 967-8862\u0022\u003E(808) 967-8862\u003C\/a\u003E \u003Cstrong\u003E*Note:\u003C\/strong\u003E Thursday October 1, 2026, was the last day that Kilauea daily update phone messages were recorded.\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":"2026-10-04","obs":"hvo","noticeId":"DOI-USGS-HVO-2026-10-04T18:21:26+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-HVO-2026-10-04T18:21:26+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-HVO-2026-10-04T18:21:26+00:00","obsAlertLevel":"WATCH","obsColorCode":"ORANGE","noticeHighestAlertLevel":"WATCH","noticeHighestColorCode":"ORANGE","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EHAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ESunday, October 4, 2026, 8:30 AM HST (Sunday, October 4, 2026, 18:30 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EKILAUEA\u003C\/b\u003E (VNUM #332010)\u003Cbr\/\u003E19\u00b025'16\u0022 N 155\u00b017'13\u0022 W, Summit Elevation 4091 ft (1247 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: WATCH\u003Cbr\/\u003ECurrent Aviation Color Code: ORANGE\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E No overflows or spattering at north or south vents over the past day; strong glow and flames continue. No reactivation of Sept. 30\u2013Oct. 1 intrusion. Earthquake activity continues underneath Halema\u02bbuma\u02bbu. No anomalous activity outside the summit.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EOverview:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThere have been no overflows or spatter from north or vents in the past 24 hours, although there was strong glow and flames from the vents overnight. The summit intrusion that happened the night of September 30 to October 1 has not reactivated, although earthquake activity has continued underneath Halema\u02bbuma\u02bbu and summit tiltmeters recorded minor inflation.\u003C\/p\u003E\u003Cp\u003EEpisode 55 fountaining remains a possibility during the ongoing K\u012blauea summit eruption. It is also possible that intrusive activity below K\u012blauea summit caldera could resume and potentially lead to the eruption of lava in a new location within the caldera.\u003C\/p\u003E\u003Cp\u003ENo anomalous seismic activity or deformation has occurred outside of the summit region, and no significant activity has been noted along K\u012blauea\u2019s East Rift Zone or Southwest Rift Zone.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESTATUS REPORT published during intrusive activity:\u003C\/strong\u003E \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-10-01T08:14:21+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-10-01T08:14:21+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EVOLCANO WATCH summarizing recent intrusive activity: \u003C\/strong\u003E\u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-intrusion-during-eruption-summit-kilauea\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-intrusion-during-eruption-summit-kilauea\u003C\/a\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESTATUS REPORT on changes in activity and implications for this eruption: \u003C\/strong\u003E\u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-09-15T03:18:09+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-09-15T03:18:09+00:00\u003C\/a\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ENOTE: \u003C\/strong\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\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EIn the past 24 hours, there have been no overflows and no spattering. Both vents had strong glow with flaming overnight. No other areas of incandescence were observed across the summit region last night. An intrusion underneath Kaluapele, the K\u012blauea summit caldera, started the afternoon of September 30 and ended on October 1 at around 4 a.m. H.S.T. South vent only had one overflow after the intrusion, ending just before 6 a.m. on October 1, and north vent's last overflow was also on October 1, just after 6 a.m. H.S.T. \u003C\/p\u003E\u003Cp\u003EElevated rates of earthquakes below Kaluapele continue following the intrusion. In the past 24 hours, there were 9 shallow earthquakes located across the summit region, primarily underneath Halema\u02bbuma\u02bbu, and the U\u0113kahuna tiltmeter (UWD) recorded approximately 0.7 microradians of inflation.\u003C\/p\u003E\u003Cp\u003EDuring inter-episode pauses, the sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rate from the summit typically varies between 1,000 and 5,000 tonnes per day. Winds are currently forecast from the north northeast.\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. No significant ground deformation was recorded in either rift zone.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis\u003C\/strong\u003E:\u003C\/p\u003E\u003Cp\u003EMonitoring data indicate that a shallow intrusion occurred the afternoon of September 30 through to the morning of October 1 underneath Halema\u02bbuma\u02bbu. The intrusion did not reactive in the past 24 hours, although conditions can change rapidly, including eruption from a new vent with little or no seismicity or deformation.\u003C\/p\u003E\u003Cp\u003EIn the past 24 hours, there was no spattering or overflows at north or south vents. Forecast windows for a potential episode 55 can no longer be modeled due to the irregular changes in inflation and deflation. The north vent has produced the last 11 high fountain events (episodes 44\u201354). It is not possible to say with certainty that this activity will lead to the onset of another fountain event at this time, although conditions remain favorable.\u003C\/p\u003E\u003Cp\u003EBecause the summit system remains active and highly pressurized, the two most likely possibilities are that activity continues at the north-south-west vent complex, or it activates another existing weak crack system in the summit region. Neither of these events are likely to produce a strong seismic precursor, so the alert levels have been left at ORANGE\/WATCH as the volcano continues to \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/alert-level-system\u0022\u003E\u0022exhibit heightened unrest with an increased potential for eruption\u0022\u003C\/a\u003E. For further details about potential scenarios see the September 15 \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-09-15T03:18:09+00:00\u0022\u003EStatus Report\u003C\/a\u003E.\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 of two or more 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\u003ESummary of episode 54:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EA detailed account of episode 54 is given in the HVO Status Report issued on August 25: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-08-26T05:56:38+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-08-26T05:56:38+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEpisode 54 of the ongoing Halema\u02bbuma\u02bbu eruption began around 10:30 a.m. HST and ended at 7:33 p.m. HST on August 25, 2026, after 9 hours of continuous lava fountaining. \u003C\/li\u003E\u003Cli\u003EThe maximum lava fountain height from the north vent was approximately 500 feet (150 meters) above ground level, reached between 12:15 p.m. and 1:00 p.m. HST. Neither the south vent nor the new west vent (formerly the collapse pit) fountained during this episode.\u003C\/li\u003E\u003Cli\u003EThe maximum plume height was approximately 17,000 feet (5,200 meters) above sea level.\u003C\/li\u003E\u003Cli\u003EMost tephra fall was restricted to the closed area of Hawai\u02bbi Volcanoes National Park, southwest of the active eruptive vents in Halema\u02bbuma\u02bbu. However, HVO did also receive a report of trace Pele\u2019s hair falling in the Ka\u2018\u016b district of the Island of Hawai\u02bbi.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EResources:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ENOTE:\u003C\/strong\u003E HVO\u2019s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations will remain offline as we continue working to repair instruments and re-establish connections in our monitoring network.\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\u003EEruptive activity since December 2024 has been occurring within a closed area of Hawai'i Volcanoes National Park. However, this week's intrusion highlights that the location of eruptive activity could change. Intrusions can also be hazardous with potential to cause earthquakes, ground cracks, and small landslides. The primary hazards at Kilauea due to eruptive activity and\/or intrusions are:\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003E\u003Cstrong\u003EVolcanic Gas:\u003C\/strong\u003E 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\u003E\u003Cstrong\u003ETephra: \u003C\/strong\u003ESmall 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 and \u003Ca href=\u0022https:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u0022\u003Ehttps:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u003C\/a\u003E \u003C\/li\u003E\u003Cli\u003E\u003Cstrong\u003ELava flows: \u003C\/strong\u003EHawaiian lava flows generally advance slowly downslope but destroy everything in their paths. Lava flows that erupt within Halema\u02bbuma\u02bbu crater remain confined to Halema\u02bbuma\u02bbu and Kaluapele. Lava flows from the eruption that started in December 2024 have been confined to Halema\u02bbuma\u02bbu, an area closed to the public. Hazards associated with active or recent lava flows include hot and glassy (sharp) surfaces that can cause serious burns, abrasions, and lacerations upon contact with unprotected or exposed skin; uneven and rough terrain can lead to falls and other injuries; hot temperatures that can cause heat exhaustion or dehydration, or in heavy rain can produce steamy ground-fog that can be acidic, severely limiting visibility and sometimes causing difficulty breathing.\u003C\/li\u003E\u003Cli\u003E\u003Cstrong\u003EEarthquakes and ground cracks: \u003C\/strong\u003EShallow magma movement and eruptions can produce minor to severe ground fractures and subsidence features. These ground cracks can continue to widen and offset as magma migration continues, may have unstable overhanging edges, and should be avoided. Other significant hazards exist around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EAdditionally, 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\u003Cp\u003E \u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\u003Cstrong\u003EMore Information:\u003C\/strong\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EK\u012blauea 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\u003Cli\u003EK\u012blauea activity summary also available by phone: \u003Ca href=\u0022tel:(808) 967-8862\u0022\u003E(808) 967-8862\u003C\/a\u003E \u003Cstrong\u003E*Note:\u003C\/strong\u003E Thursday October 1, 2026, was the last day that Kilauea daily update phone messages were recorded.\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\u003EThere have been no overflows or spatter from north or vents in the past 24 hours, although there was strong glow and flames from the vents overnight. The summit intrusion that happened the night of September 30 to October 1 has not reactivated, although earthquake activity has continued underneath Halema\u02bbuma\u02bbu and summit tiltmeters recorded minor inflation.\u003C\/p\u003E\u003Cp\u003EEpisode 55 fountaining remains a possibility during the ongoing K\u012blauea summit eruption. It is also possible that intrusive activity below K\u012blauea summit caldera could resume and potentially lead to the eruption of lava in a new location within the caldera.\u003C\/p\u003E\u003Cp\u003ENo anomalous seismic activity or deformation has occurred outside of the summit region, and no significant activity has been noted along K\u012blauea\u2019s East Rift Zone or Southwest Rift Zone.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESTATUS REPORT published during intrusive activity:\u003C\/strong\u003E \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-10-01T08:14:21+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-10-01T08:14:21+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EVOLCANO WATCH summarizing recent intrusive activity: \u003C\/strong\u003E\u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-intrusion-during-eruption-summit-kilauea\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-intrusion-during-eruption-summit-kilauea\u003C\/a\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESTATUS REPORT on changes in activity and implications for this eruption: \u003C\/strong\u003E\u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-09-15T03:18:09+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-09-15T03:18:09+00:00\u003C\/a\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ENOTE: \u003C\/strong\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\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EIn the past 24 hours, there have been no overflows and no spattering. Both vents had strong glow with flaming overnight. No other areas of incandescence were observed across the summit region last night. An intrusion underneath Kaluapele, the K\u012blauea summit caldera, started the afternoon of September 30 and ended on October 1 at around 4 a.m. H.S.T. South vent only had one overflow after the intrusion, ending just before 6 a.m. on October 1, and north vent's last overflow was also on October 1, just after 6 a.m. H.S.T. \u003C\/p\u003E\u003Cp\u003EElevated rates of earthquakes below Kaluapele continue following the intrusion. In the past 24 hours, there were 9 shallow earthquakes located across the summit region, primarily underneath Halema\u02bbuma\u02bbu, and the U\u0113kahuna tiltmeter (UWD) recorded approximately 0.7 microradians of inflation.\u003C\/p\u003E\u003Cp\u003EDuring inter-episode pauses, the sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rate from the summit typically varies between 1,000 and 5,000 tonnes per day. Winds are currently forecast from the north northeast.\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. No significant ground deformation was recorded in either rift zone.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis\u003C\/strong\u003E:\u003C\/p\u003E\u003Cp\u003EMonitoring data indicate that a shallow intrusion occurred the afternoon of September 30 through to the morning of October 1 underneath Halema\u02bbuma\u02bbu. The intrusion did not reactive in the past 24 hours, although conditions can change rapidly, including eruption from a new vent with little or no seismicity or deformation.\u003C\/p\u003E\u003Cp\u003EIn the past 24 hours, there was no spattering or overflows at north or south vents. Forecast windows for a potential episode 55 can no longer be modeled due to the irregular changes in inflation and deflation. The north vent has produced the last 11 high fountain events (episodes 44\u201354). It is not possible to say with certainty that this activity will lead to the onset of another fountain event at this time, although conditions remain favorable.\u003C\/p\u003E\u003Cp\u003EBecause the summit system remains active and highly pressurized, the two most likely possibilities are that activity continues at the north-south-west vent complex, or it activates another existing weak crack system in the summit region. Neither of these events are likely to produce a strong seismic precursor, so the alert levels have been left at ORANGE\/WATCH as the volcano continues to \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/alert-level-system\u0022\u003E\u0022exhibit heightened unrest with an increased potential for eruption\u0022\u003C\/a\u003E. For further details about potential scenarios see the September 15 \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-09-15T03:18:09+00:00\u0022\u003EStatus Report\u003C\/a\u003E.\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 of two or more 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\u003ESummary of episode 54:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EA detailed account of episode 54 is given in the HVO Status Report issued on August 25: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-08-26T05:56:38+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-08-26T05:56:38+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEpisode 54 of the ongoing Halema\u02bbuma\u02bbu eruption began around 10:30 a.m. HST and ended at 7:33 p.m. HST on August 25, 2026, after 9 hours of continuous lava fountaining. \u003C\/li\u003E\u003Cli\u003EThe maximum lava fountain height from the north vent was approximately 500 feet (150 meters) above ground level, reached between 12:15 p.m. and 1:00 p.m. HST. Neither the south vent nor the new west vent (formerly the collapse pit) fountained during this episode.\u003C\/li\u003E\u003Cli\u003EThe maximum plume height was approximately 17,000 feet (5,200 meters) above sea level.\u003C\/li\u003E\u003Cli\u003EMost tephra fall was restricted to the closed area of Hawai\u02bbi Volcanoes National Park, southwest of the active eruptive vents in Halema\u02bbuma\u02bbu. However, HVO did also receive a report of trace Pele\u2019s hair falling in the Ka\u2018\u016b district of the Island of Hawai\u02bbi.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EResources:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ENOTE:\u003C\/strong\u003E HVO\u2019s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations will remain offline as we continue working to repair instruments and re-establish connections in our monitoring network.\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\u003EEruptive activity since December 2024 has been occurring within a closed area of Hawai'i Volcanoes National Park. However, this week's intrusion highlights that the location of eruptive activity could change. Intrusions can also be hazardous with potential to cause earthquakes, ground cracks, and small landslides. The primary hazards at Kilauea due to eruptive activity and\/or intrusions are:\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003E\u003Cstrong\u003EVolcanic Gas:\u003C\/strong\u003E 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\u003E\u003Cstrong\u003ETephra: \u003C\/strong\u003ESmall 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 and \u003Ca href=\u0022https:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u0022\u003Ehttps:\/\/vog.ivhhn.org\/sites\/default\/files\/PelesHair_FAQs_v2.pdf\u003C\/a\u003E \u003C\/li\u003E\u003Cli\u003E\u003Cstrong\u003ELava flows: \u003C\/strong\u003EHawaiian lava flows generally advance slowly downslope but destroy everything in their paths. Lava flows that erupt within Halema\u02bbuma\u02bbu crater remain confined to Halema\u02bbuma\u02bbu and Kaluapele. Lava flows from the eruption that started in December 2024 have been confined to Halema\u02bbuma\u02bbu, an area closed to the public. Hazards associated with active or recent lava flows include hot and glassy (sharp) surfaces that can cause serious burns, abrasions, and lacerations upon contact with unprotected or exposed skin; uneven and rough terrain can lead to falls and other injuries; hot temperatures that can cause heat exhaustion or dehydration, or in heavy rain can produce steamy ground-fog that can be acidic, severely limiting visibility and sometimes causing difficulty breathing.\u003C\/li\u003E\u003Cli\u003E\u003Cstrong\u003EEarthquakes and ground cracks: \u003C\/strong\u003EShallow magma movement and eruptions can produce minor to severe ground fractures and subsidence features. These ground cracks can continue to widen and offset as magma migration continues, may have unstable overhanging edges, and should be avoided. Other significant hazards exist around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EAdditionally, 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\u003Cp\u003E \u003C\/p\u003E","synopsis":"HVO Kilauea ORANGE\/WATCH - No overflows or spattering at north or south vents over the past day; strong glow and flames continue. No reactivation of Sept. 30\u2013Oct. 1 intrusion. Earthquake activity continues underneath Halema\u02bbuma\u02bbu. No anomalous activity outside the summit.","alertLevel":"WATCH","colorCode":"ORANGE","vName":"Kilauea","vnum":"332010","lat":19.421,"lng":-155.287,"vUrl":"https:\/\/www.usgs.gov\/volcanoes\/kilauea","vImage":"https:\/\/volcanoes.usgs.gov\/vsc\/images\/kilauea\/kilauea.jpg","region":"Hawaii","sectionId":"DOI-USGS-HVO-2026-10-04T18:21:26+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, October 2, 2026, 6:39 AM ChST (Thursday, October 1, 2026, 20:39 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: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E No plumes seen in satellite images; no significant geophysical signals.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ENo notable activity was detected in distal geophysical monitoring data or satellite images over the past week. \u003C\/p\u003E\u003Cp\u003EEruptive activity at Ahyi seamount may present a hazard to mariners in the water above and near the volcano.\u202fThe summit has shallowed over the course of previous eruptions to 180 feet (55 m) below sea level, but the lack of local real-time data means we are unable to forecast or warn of impending eruptions. 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. The most recent eruptive activity began in 2022. \u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003ENorthern Mariana Islands Volcano Observatory\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E No signs of significant volcanic unrest.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003ENORTHERN MARIANAS VOLCANOES\u003C\/strong\u003E\u003Cbr\u003ENo signs of unrest were detected at any Northern Mariana Island volcanoes besides Ahyi seamount 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.\u003Cbr\u003E\u003Cbr\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\u003EUSGS Northern Mariana Duty Scientist (907) 786-7497\u003Cbr\u003E\u003Ca href=\u0022http:\/\/volcano.wr.usgs.gov\/cnmistatus.php\u0022\u003Ehttp:\/\/volcano.wr.usgs.gov\/cnmistatus.php\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003ECNMI Homeland Security and Emergency Management\u003Cbr\u003E\u003Ca href=\u0022https:\/\/opd.gov.mp\/library\/agency\/homeland-security-and-emergency-management.html\u0022\u003Ehttps:\/\/opd.gov.mp\/library\/agency\/homeland-security-and-emergency-management.html\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003ESatellite information, Washington VAAC\u003Cbr\u003E\u003Ca href=\u0022http:\/\/www.ssd.noaa.gov\/VAAC\/washington.html\u0022\u003Ehttp:\/\/www.ssd.noaa.gov\/VAAC\/washington.html\u003C\/a\u003E\u003C\/p\u003E","sentUtc":"2026-10-01","obs":"nmi","noticeId":"DOI-USGS-NMI-2026-10-01T20:37:33+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-NMI-2026-10-01T20:37:33+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-NMI-2026-10-01T20:37:33+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\u003ENORTHERN MARIANA ISLANDS WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, October 2, 2026, 6:39 AM ChST (Thursday, October 1, 2026, 20:39 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\u003ENorthern Mariana Islands Volcano Observatory\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E No signs of significant volcanic unrest.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003ENORTHERN MARIANAS VOLCANOES\u003C\/strong\u003E\u003Cbr\u003ENo signs of unrest were detected at any Northern Mariana Island volcanoes besides Ahyi seamount 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.\u003Cbr\u003E\u003Cbr\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 (ADVISORY\/YELLOW).\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\u003EUSGS Northern Mariana Duty Scientist (907) 786-7497\u003Cbr\u003E\u003Ca href=\u0022http:\/\/volcano.wr.usgs.gov\/cnmistatus.php\u0022\u003Ehttp:\/\/volcano.wr.usgs.gov\/cnmistatus.php\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003ECNMI Homeland Security and Emergency Management\u003Cbr\u003E\u003Ca href=\u0022https:\/\/opd.gov.mp\/library\/agency\/homeland-security-and-emergency-management.html\u0022\u003Ehttps:\/\/opd.gov.mp\/library\/agency\/homeland-security-and-emergency-management.html\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003ESatellite information, Washington VAAC\u003Cbr\u003E\u003Ca href=\u0022http:\/\/www.ssd.noaa.gov\/VAAC\/washington.html\u0022\u003Ehttp:\/\/www.ssd.noaa.gov\/VAAC\/washington.html\u003C\/a\u003E\u003C\/p\u003E","summary":"\u003Cp\u003E\u003Cstrong\u003ENORTHERN MARIANAS VOLCANOES\u003C\/strong\u003E\u003Cbr\u003ENo signs of unrest were detected at any Northern Mariana Island volcanoes besides Ahyi seamount 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.\u003Cbr\u003E\u003Cbr\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 signs of significant volcanic unrest.","alertLevel":"UNASSIGNED","colorCode":"UNASSIGNED","vName":null,"vnum":null,"lat":null,"lng":null,"vUrl":null,"vImage":null,"region":null,"sectionId":"DOI-USGS-NMI-2026-10-01T20:37:34+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, October 2, 2026, 6:39 AM ChST (Thursday, October 1, 2026, 20:39 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: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E No plumes seen in satellite images; no significant geophysical signals.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ENo notable activity was detected in distal geophysical monitoring data or satellite images over the past week. \u003C\/p\u003E\u003Cp\u003EEruptive activity at Ahyi seamount may present a hazard to mariners in the water above and near the volcano.\u202fThe summit has shallowed over the course of previous eruptions to 180 feet (55 m) below sea level, but the lack of local real-time data means we are unable to forecast or warn of impending eruptions. 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. The most recent eruptive activity began in 2022. \u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cb\u003ENorthern Mariana Islands Volcano Observatory\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E No signs of significant volcanic unrest.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003ENORTHERN MARIANAS VOLCANOES\u003C\/strong\u003E\u003Cbr\u003ENo signs of unrest were detected at any Northern Mariana Island volcanoes besides Ahyi seamount 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.\u003Cbr\u003E\u003Cbr\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\u003EUSGS Northern Mariana Duty Scientist (907) 786-7497\u003Cbr\u003E\u003Ca href=\u0022http:\/\/volcano.wr.usgs.gov\/cnmistatus.php\u0022\u003Ehttp:\/\/volcano.wr.usgs.gov\/cnmistatus.php\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003ECNMI Homeland Security and Emergency Management\u003Cbr\u003E\u003Ca href=\u0022https:\/\/opd.gov.mp\/library\/agency\/homeland-security-and-emergency-management.html\u0022\u003Ehttps:\/\/opd.gov.mp\/library\/agency\/homeland-security-and-emergency-management.html\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003ESatellite information, Washington VAAC\u003Cbr\u003E\u003Ca href=\u0022http:\/\/www.ssd.noaa.gov\/VAAC\/washington.html\u0022\u003Ehttp:\/\/www.ssd.noaa.gov\/VAAC\/washington.html\u003C\/a\u003E\u003C\/p\u003E","summary":"\u003Cp\u003ENo notable activity was detected in distal geophysical monitoring data or satellite images over the past week. \u003C\/p\u003E\u003Cp\u003EEruptive activity at Ahyi seamount may present a hazard to mariners in the water above and near the volcano.\u202fThe summit has shallowed over the course of previous eruptions to 180 feet (55 m) below sea level, but the lack of local real-time data means we are unable to forecast or warn of impending eruptions. 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 YELLOW\/ADVISORY - No plumes seen in satellite images; no significant geophysical signals.","alertLevel":"ADVISORY","colorCode":"YELLOW","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-2026-10-01T20:37:33+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\u003EThursday, October 1, 2026, 9:10 AM MDT (Thursday, October 1, 2026, 15:10 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=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E YVO Monthly Update: background seismicity and deformation, small hydrothermal explosion at Biscuit Basin\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EYellowstone Caldera activity remains at background levels, with 77 located earthquakes in September (largest = M3.4). Deformation measurements indicate no significant uplift or subsidence of the caldera or north caldera rim for the past several months. A small hydrothermal explosion occurred at Biscuit Basin on September 27.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EYellowstone Volcano Observatory scientists spent September in the park conducting geological research, setting up new monitoring stations, and maintaining existing monitoring equipment.  This work included studies of Lower Geyser Basin hydrothermal activity and lakes, recovery of temporary GPS stations, microgravity measurements, maintenance of temperature monitoring stations, establishing a new hydrothermal monitoring station in Upper Geyser Basin, and reestablishing a camera with a view of Yellowstone Lake.\u003C\/p\u003E\u003Cp\u003EAlthough there were only sporadic minor eruptions from Steamboat Geyser, in Norris Geyser Basin, during the month (and only 1 major eruption so far in 2026), nearby Echinus Geyser had an eruption on September 15, continuing a trend of occasional eruptions that has persisted throughout most of the year.  In Upper Geyser Basin, Giant Geyser (the second tallest geyser in Yellowstone National Park) erupted on September 10 and 22, its fourth and fifth eruptions of the year.  The geyser appears to be in a new stage of frequent activity for the first time since 2018\u20132019.\u003C\/p\u003E\u003Cp\u003EThermal features in Biscuit Basin, in the Upper Geyser Basin not far from Old Faithful Geyser, remained active in September.  Black Diamond Pool, which was the site of a hydrothermal explosion on July 23, 2024, had several eruptions during the latter half of the month, including one large event that sent water and mud tens of feet (many meters) into the air on the night of September 23.  In addition, the small pool of hot water that formed via collapse after the June 13, 2026, hydrothermal explosion erupted multiple times on September 24 and 27.  Just after 8:12 PM MDT on September 27, the pool was the source of a hydrothermal explosion that threw boiling water, steam, mud, and rocks at least 100 feet (30 meters) into the air\u2014the first such significant explosion from this feature.  The event was well recorded by a nearby seismic, acoustic, and camera monitoring station.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring September 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 77 earthquakes in the Yellowstone National Park region. The largest event of the month was a minor earthquake of magnitude 3.4 located about 20 miles northeast of Moran, WY, on September 6 at 10:25 p.m. MDT.\u003C\/p\u003E\u003Cp\u003ESeptember seismicity in Yellowstone was marked by a small swarm of 24 earthquakes located about 7 miles north-northwest of West Yellowstone, MT, on September 8. The magnitudes ranged from -0.1 to 2.8.\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\u003EData from continuous GPS stations indicate little net deformation of the caldera or north caldera regions over the past several months.  Subtle variations in ground motion are probably caused by seasonal variations associated with groundwater conditions as summer transitions to fall.\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":"2026-10-01","obs":"yvo","noticeId":"DOI-USGS-YVO-2026-10-01T15:02:43+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-YVO-2026-10-01T15:02:43+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-YVO-2026-10-01T15:02:43+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\u003EThursday, October 1, 2026, 9:10 AM MDT (Thursday, October 1, 2026, 15:10 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=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E YVO Monthly Update: background seismicity and deformation, small hydrothermal explosion at Biscuit Basin\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EYellowstone Caldera activity remains at background levels, with 77 located earthquakes in September (largest = M3.4). Deformation measurements indicate no significant uplift or subsidence of the caldera or north caldera rim for the past several months. A small hydrothermal explosion occurred at Biscuit Basin on September 27.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EYellowstone Volcano Observatory scientists spent September in the park conducting geological research, setting up new monitoring stations, and maintaining existing monitoring equipment.  This work included studies of Lower Geyser Basin hydrothermal activity and lakes, recovery of temporary GPS stations, microgravity measurements, maintenance of temperature monitoring stations, establishing a new hydrothermal monitoring station in Upper Geyser Basin, and reestablishing a camera with a view of Yellowstone Lake.\u003C\/p\u003E\u003Cp\u003EAlthough there were only sporadic minor eruptions from Steamboat Geyser, in Norris Geyser Basin, during the month (and only 1 major eruption so far in 2026), nearby Echinus Geyser had an eruption on September 15, continuing a trend of occasional eruptions that has persisted throughout most of the year.  In Upper Geyser Basin, Giant Geyser (the second tallest geyser in Yellowstone National Park) erupted on September 10 and 22, its fourth and fifth eruptions of the year.  The geyser appears to be in a new stage of frequent activity for the first time since 2018\u20132019.\u003C\/p\u003E\u003Cp\u003EThermal features in Biscuit Basin, in the Upper Geyser Basin not far from Old Faithful Geyser, remained active in September.  Black Diamond Pool, which was the site of a hydrothermal explosion on July 23, 2024, had several eruptions during the latter half of the month, including one large event that sent water and mud tens of feet (many meters) into the air on the night of September 23.  In addition, the small pool of hot water that formed via collapse after the June 13, 2026, hydrothermal explosion erupted multiple times on September 24 and 27.  Just after 8:12 PM MDT on September 27, the pool was the source of a hydrothermal explosion that threw boiling water, steam, mud, and rocks at least 100 feet (30 meters) into the air\u2014the first such significant explosion from this feature.  The event was well recorded by a nearby seismic, acoustic, and camera monitoring station.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring September 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 77 earthquakes in the Yellowstone National Park region. The largest event of the month was a minor earthquake of magnitude 3.4 located about 20 miles northeast of Moran, WY, on September 6 at 10:25 p.m. MDT.\u003C\/p\u003E\u003Cp\u003ESeptember seismicity in Yellowstone was marked by a small swarm of 24 earthquakes located about 7 miles north-northwest of West Yellowstone, MT, on September 8. The magnitudes ranged from -0.1 to 2.8.\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\u003EData from continuous GPS stations indicate little net deformation of the caldera or north caldera regions over the past several months.  Subtle variations in ground motion are probably caused by seasonal variations associated with groundwater conditions as summer transitions to fall.\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\u003EYellowstone Caldera activity remains at background levels, with 77 located earthquakes in September (largest = M3.4). Deformation measurements indicate no significant uplift or subsidence of the caldera or north caldera rim for the past several months. A small hydrothermal explosion occurred at Biscuit Basin on September 27.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EYellowstone Volcano Observatory scientists spent September in the park conducting geological research, setting up new monitoring stations, and maintaining existing monitoring equipment.  This work included studies of Lower Geyser Basin hydrothermal activity and lakes, recovery of temporary GPS stations, microgravity measurements, maintenance of temperature monitoring stations, establishing a new hydrothermal monitoring station in Upper Geyser Basin, and reestablishing a camera with a view of Yellowstone Lake.\u003C\/p\u003E\u003Cp\u003EAlthough there were only sporadic minor eruptions from Steamboat Geyser, in Norris Geyser Basin, during the month (and only 1 major eruption so far in 2026), nearby Echinus Geyser had an eruption on September 15, continuing a trend of occasional eruptions that has persisted throughout most of the year.  In Upper Geyser Basin, Giant Geyser (the second tallest geyser in Yellowstone National Park) erupted on September 10 and 22, its fourth and fifth eruptions of the year.  The geyser appears to be in a new stage of frequent activity for the first time since 2018\u20132019.\u003C\/p\u003E\u003Cp\u003EThermal features in Biscuit Basin, in the Upper Geyser Basin not far from Old Faithful Geyser, remained active in September.  Black Diamond Pool, which was the site of a hydrothermal explosion on July 23, 2024, had several eruptions during the latter half of the month, including one large event that sent water and mud tens of feet (many meters) into the air on the night of September 23.  In addition, the small pool of hot water that formed via collapse after the June 13, 2026, hydrothermal explosion erupted multiple times on September 24 and 27.  Just after 8:12 PM MDT on September 27, the pool was the source of a hydrothermal explosion that threw boiling water, steam, mud, and rocks at least 100 feet (30 meters) into the air\u2014the first such significant explosion from this feature.  The event was well recorded by a nearby seismic, acoustic, and camera monitoring station.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring September 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 77 earthquakes in the Yellowstone National Park region. The largest event of the month was a minor earthquake of magnitude 3.4 located about 20 miles northeast of Moran, WY, on September 6 at 10:25 p.m. MDT.\u003C\/p\u003E\u003Cp\u003ESeptember seismicity in Yellowstone was marked by a small swarm of 24 earthquakes located about 7 miles north-northwest of West Yellowstone, MT, on September 8. The magnitudes ranged from -0.1 to 2.8.\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\u003EData from continuous GPS stations indicate little net deformation of the caldera or north caldera regions over the past several months.  Subtle variations in ground motion are probably caused by seasonal variations associated with groundwater conditions as summer transitions to fall.\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, small hydrothermal explosion at Biscuit Basin","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-2026-10-01T15:02:43+00:00"}]}]