[{"noticeTitle":"ALASKA VOLCANO OBSERVATORY VOLCANO OBSERVATORY NOTICE FOR AVIATION","noticeHtml":"\u003Ch4\u003EVOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)\u003C\/h4\u003E\u003Cpre\u003EWMAK01 PAVO 250019   \nVONA\nDTG:                    20260725\/0019Z\nVOLCANO:                KATMAI 312170\nPSN:                    N5817 W15457\nAREA:                   ALASKA\nSOURCE ELEV:            6716FT AMSL\nNOTICE NR:              2026\/03\nCURRENT COLOUR CODE:    GREEN\nPREVIOUS COLOUR CODE:   GREEN\nSVO:                    ALASKA VOLCANO OBSERVATORY\nACT STS:                RE-SUSPENDED VA\nONSET:                  NIL\nDUR:                    NIL\nVA CLD HGT:             6000FT AMSL\nHGT SOURCE:             SIGMET\nMOV:                    SE\nCTC:                    AVO DUTY SCIENTIST TEL +1-907-786-7497\nRMK:                    NO ERUPTION. RESUSPENDED VA FROM GND LEVEL ONLY. SEE SIGMET FOR MORE INFO.\nNXT NOTICE:             A NEW VONA WILL BE ISSUED IF COND CHANGE SIGNIFICANTLY OR IF THE COLOR CODE CHANGES\nNNNN\u003C\/pre\u003E","sentUtc":"2026-07-25","obs":"avo","noticeId":"DOI-USGS-AVO-2026-03-06T00:26:58+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-AVO-2026-03-06T00:26:58+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-AVO-2026-03-06T00:26:58+00:00","obsAlertLevel":"WATCH","obsColorCode":"ORANGE","noticeHighestAlertLevel":"NORMAL","noticeHighestColorCode":"GREEN","noticeSections":[{"sectionHtml":"\u003Cb\u003EAVO\/USGS Volcanic Activity Notice\u003C\/b\u003E\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            Volcano: \u003Cb\u003EKatmai\u003C\/b\u003E (VNUM #312170)\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            Current Volcano Alert Level: NORMAL\u003Cbr\/\u003ECurrent Aviation Color Code: GREEN\u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EIssued:\u003C\/b\u003E Friday, July 24, 2026, 4:19 PM AKDT\n            \u003Cbr\/\u003E\n            \u003Cb\u003ESource:\u003C\/b\u003E Alaska Volcano Observatory\n            \u003Cbr\/\u003E\n            \u003Cb\u003ENotice Number:\u003C\/b\u003E 2026\/A151\n            \u003Cbr\/\u003E\n            \u003Cb\u003ELocation:\u003C\/b\u003E N 58 deg 16 min W 154 deg 57 min\n            \u003Cbr\/\u003E\n            \u003Cb\u003EElevation:\u003C\/b\u003E 6716 ft (2047 m)\n            \u003Cbr\/\u003E\n            \u003Cb\u003EArea:\u003C\/b\u003E Alaska Peninsula \n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ESummary:\u003C\/b\u003E \u003Cspan name=\u0022synopsis\u0022\u003EResuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN\/NORMAL.\u003C\/span\u003E\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EVolcanic Activity:\u003C\/b\u003E \u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EStrong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and are carrying it to the southeast. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 6,000 ft (1.8 km) above sea level.\u003C\/p\u003E\u003Cp\u003EThis phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. All of the volcanoes of the Katmai area (Griggs, Katmai, Novarupta, Mageik, Martin, Snowy and Trident) remain at Aviation Color Code GREEN and Alert Level NORMAL. Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health.\u003C\/p\u003E\u003Cp\u003EFor more information on volcanic ash and human health, visit the following website: \u003Ca href=\u0022http:\/\/volcanoes.usgs.gov\/ash\/\u0022\u003Ehttp:\/\/volcanoes.usgs.gov\/ash\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EOfficial warnings about these ash resuspension events are issued by the National Weather Service: \u003Ca href=\u0022https:\/\/www.weather.gov\/afc\/\u0022\u003Ehttps:\/\/www.weather.gov\/afc\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of airborne ash hazard to aircraft: https:\/\/www.weather.gov\/aawu\/. Volcanic Ash Advisories: \u003Ca href=\u0022https:\/\/www.weather.gov\/vaac\/\u0022\u003Ehttps:\/\/www.weather.gov\/vaac\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of ashfall: \u003Ca href=\u0022http:\/\/www.weather.gov\/afc\u0022\u003Ehttp:\/\/www.weather.gov\/afc\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EAir quality hazards and guidance from Alaska Department of Environmental Conservation, Division of Air Quality: \u003Ca href=\u0022http:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u0022\u003Ehttp:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u003C\/a\u003E\u003C\/p\u003E\u003C\/span\u003E\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EContacts:\u003C\/b\u003E \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\u003EStrong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and are carrying it to the southeast. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 6,000 ft (1.8 km) above sea level.\u003C\/p\u003E\u003Cp\u003EThis phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. All of the volcanoes of the Katmai area (Griggs, Katmai, Novarupta, Mageik, Martin, Snowy and Trident) remain at Aviation Color Code GREEN and Alert Level NORMAL. Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health.\u003C\/p\u003E\u003Cp\u003EFor more information on volcanic ash and human health, visit the following website: \u003Ca href=\u0022http:\/\/volcanoes.usgs.gov\/ash\/\u0022\u003Ehttp:\/\/volcanoes.usgs.gov\/ash\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EOfficial warnings about these ash resuspension events are issued by the National Weather Service: \u003Ca href=\u0022https:\/\/www.weather.gov\/afc\/\u0022\u003Ehttps:\/\/www.weather.gov\/afc\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of airborne ash hazard to aircraft: https:\/\/www.weather.gov\/aawu\/. Volcanic Ash Advisories: \u003Ca href=\u0022https:\/\/www.weather.gov\/vaac\/\u0022\u003Ehttps:\/\/www.weather.gov\/vaac\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of ashfall: \u003Ca href=\u0022http:\/\/www.weather.gov\/afc\u0022\u003Ehttp:\/\/www.weather.gov\/afc\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EAir quality hazards and guidance from Alaska Department of Environmental Conservation, Division of Air Quality: \u003Ca href=\u0022http:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u0022\u003Ehttp:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u003C\/a\u003E\u003C\/p\u003E","synopsis":"AVO Katmai GREEN\/NORMAL - Resuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN\/NORMAL.","alertLevel":"NORMAL","colorCode":"GREEN","vName":"Katmai","vnum":"312170","lat":58.279,"lng":-154.9533,"vUrl":"https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Katmai","vImage":"https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107821287_75_3.jpg","region":"Alaska Peninsula","sectionId":"DOI-USGS-AVO-2026-03-06T00:26:58+00:00"},{"sectionHtml":"\u003Ch4\u003EVOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)\u003C\/h4\u003E\u003Cpre\u003EWMAK01 PAVO 250019   \nVONA\nDTG:                    20260725\/0019Z\nVOLCANO:                KATMAI 312170\nPSN:                    N5817 W15457\nAREA:                   ALASKA\nSOURCE ELEV:            6716FT AMSL\nNOTICE NR:              2026\/03\nCURRENT COLOUR CODE:    GREEN\nPREVIOUS COLOUR CODE:   GREEN\nSVO:                    ALASKA VOLCANO OBSERVATORY\nACT STS:                RE-SUSPENDED VA\nONSET:                  NIL\nDUR:                    NIL\nVA CLD HGT:             6000FT AMSL\nHGT SOURCE:             SIGMET\nMOV:                    SE\nCTC:                    AVO DUTY SCIENTIST TEL +1-907-786-7497\nRMK:                    NO ERUPTION. RESUSPENDED VA FROM GND LEVEL ONLY. SEE SIGMET FOR MORE INFO.\nNXT NOTICE:             A NEW VONA WILL BE ISSUED IF COND CHANGE SIGNIFICANTLY OR IF THE COLOR CODE CHANGES\nNNNN\u003C\/pre\u003E","summary":"\u003Cp\u003EStrong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and are carrying it to the southeast. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 6,000 ft (1.8 km) above sea level.\u003C\/p\u003E\u003Cp\u003EThis phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. All of the volcanoes of the Katmai area (Griggs, Katmai, Novarupta, Mageik, Martin, Snowy and Trident) remain at Aviation Color Code GREEN and Alert Level NORMAL. Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health.\u003C\/p\u003E\u003Cp\u003EFor more information on volcanic ash and human health, visit the following website: \u003Ca href=\u0022http:\/\/volcanoes.usgs.gov\/ash\/\u0022\u003Ehttp:\/\/volcanoes.usgs.gov\/ash\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EOfficial warnings about these ash resuspension events are issued by the National Weather Service: \u003Ca href=\u0022https:\/\/www.weather.gov\/afc\/\u0022\u003Ehttps:\/\/www.weather.gov\/afc\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of airborne ash hazard to aircraft: https:\/\/www.weather.gov\/aawu\/. Volcanic Ash Advisories: \u003Ca href=\u0022https:\/\/www.weather.gov\/vaac\/\u0022\u003Ehttps:\/\/www.weather.gov\/vaac\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of ashfall: \u003Ca href=\u0022http:\/\/www.weather.gov\/afc\u0022\u003Ehttp:\/\/www.weather.gov\/afc\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EAir quality hazards and guidance from Alaska Department of Environmental Conservation, Division of Air Quality: \u003Ca href=\u0022http:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u0022\u003Ehttp:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u003C\/a\u003E\u003C\/p\u003E","synopsis":"AVO Katmai GREEN\/NORMAL - Resuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN\/NORMAL.","alertLevel":"NORMAL","colorCode":"GREEN","vName":"Katmai","vnum":"312170","lat":58.279,"lng":-154.9533,"vUrl":"https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Katmai","vImage":"https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107821287_75_3.jpg","region":"Alaska Peninsula","sectionId":"DOI-USGS-AVO-2026-03-06T00:26:58+00:00"}]},{"noticeTitle":"ALASKA VOLCANO OBSERVATORY VOLCANO ACTIVITY NOTIFICATION","noticeHtml":"\u003Cb\u003EAVO\/USGS Volcanic Activity Notice\u003C\/b\u003E\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            Volcano: \u003Cb\u003EKatmai\u003C\/b\u003E (VNUM #312170)\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            Current Volcano Alert Level: NORMAL\u003Cbr\/\u003ECurrent Aviation Color Code: GREEN\u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EIssued:\u003C\/b\u003E Friday, July 24, 2026, 4:19 PM AKDT\n            \u003Cbr\/\u003E\n            \u003Cb\u003ESource:\u003C\/b\u003E Alaska Volcano Observatory\n            \u003Cbr\/\u003E\n            \u003Cb\u003ENotice Number:\u003C\/b\u003E 2026\/A151\n            \u003Cbr\/\u003E\n            \u003Cb\u003ELocation:\u003C\/b\u003E N 58 deg 16 min W 154 deg 57 min\n            \u003Cbr\/\u003E\n            \u003Cb\u003EElevation:\u003C\/b\u003E 6716 ft (2047 m)\n            \u003Cbr\/\u003E\n            \u003Cb\u003EArea:\u003C\/b\u003E Alaska Peninsula \n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ESummary:\u003C\/b\u003E \u003Cspan name=\u0022synopsis\u0022\u003EResuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN\/NORMAL.\u003C\/span\u003E\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EVolcanic Activity:\u003C\/b\u003E \u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EStrong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and are carrying it to the southeast. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 6,000 ft (1.8 km) above sea level.\u003C\/p\u003E\u003Cp\u003EThis phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. All of the volcanoes of the Katmai area (Griggs, Katmai, Novarupta, Mageik, Martin, Snowy and Trident) remain at Aviation Color Code GREEN and Alert Level NORMAL. Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health.\u003C\/p\u003E\u003Cp\u003EFor more information on volcanic ash and human health, visit the following website: \u003Ca href=\u0022http:\/\/volcanoes.usgs.gov\/ash\/\u0022\u003Ehttp:\/\/volcanoes.usgs.gov\/ash\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EOfficial warnings about these ash resuspension events are issued by the National Weather Service: \u003Ca href=\u0022https:\/\/www.weather.gov\/afc\/\u0022\u003Ehttps:\/\/www.weather.gov\/afc\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of airborne ash hazard to aircraft: https:\/\/www.weather.gov\/aawu\/. Volcanic Ash Advisories: \u003Ca href=\u0022https:\/\/www.weather.gov\/vaac\/\u0022\u003Ehttps:\/\/www.weather.gov\/vaac\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of ashfall: \u003Ca href=\u0022http:\/\/www.weather.gov\/afc\u0022\u003Ehttp:\/\/www.weather.gov\/afc\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EAir quality hazards and guidance from Alaska Department of Environmental Conservation, Division of Air Quality: \u003Ca href=\u0022http:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u0022\u003Ehttp:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u003C\/a\u003E\u003C\/p\u003E\u003C\/span\u003E\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EContacts:\u003C\/b\u003E \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":"2026-07-25","obs":"avo","noticeId":"DOI-USGS-AVO-2026-03-06T00:26:58+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-AVO-2026-03-06T00:26:58+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-AVO-2026-03-06T00:26:58+00:00","obsAlertLevel":"WATCH","obsColorCode":"ORANGE","noticeHighestAlertLevel":"NORMAL","noticeHighestColorCode":"GREEN","noticeSections":[{"sectionHtml":"\u003Cb\u003EAVO\/USGS Volcanic Activity Notice\u003C\/b\u003E\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            Volcano: \u003Cb\u003EKatmai\u003C\/b\u003E (VNUM #312170)\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            Current Volcano Alert Level: NORMAL\u003Cbr\/\u003ECurrent Aviation Color Code: GREEN\u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EIssued:\u003C\/b\u003E Friday, July 24, 2026, 4:19 PM AKDT\n            \u003Cbr\/\u003E\n            \u003Cb\u003ESource:\u003C\/b\u003E Alaska Volcano Observatory\n            \u003Cbr\/\u003E\n            \u003Cb\u003ENotice Number:\u003C\/b\u003E 2026\/A151\n            \u003Cbr\/\u003E\n            \u003Cb\u003ELocation:\u003C\/b\u003E N 58 deg 16 min W 154 deg 57 min\n            \u003Cbr\/\u003E\n            \u003Cb\u003EElevation:\u003C\/b\u003E 6716 ft (2047 m)\n            \u003Cbr\/\u003E\n            \u003Cb\u003EArea:\u003C\/b\u003E Alaska Peninsula \n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ESummary:\u003C\/b\u003E \u003Cspan name=\u0022synopsis\u0022\u003EResuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN\/NORMAL.\u003C\/span\u003E\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EVolcanic Activity:\u003C\/b\u003E \u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EStrong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and are carrying it to the southeast. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 6,000 ft (1.8 km) above sea level.\u003C\/p\u003E\u003Cp\u003EThis phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. All of the volcanoes of the Katmai area (Griggs, Katmai, Novarupta, Mageik, Martin, Snowy and Trident) remain at Aviation Color Code GREEN and Alert Level NORMAL. Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health.\u003C\/p\u003E\u003Cp\u003EFor more information on volcanic ash and human health, visit the following website: \u003Ca href=\u0022http:\/\/volcanoes.usgs.gov\/ash\/\u0022\u003Ehttp:\/\/volcanoes.usgs.gov\/ash\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EOfficial warnings about these ash resuspension events are issued by the National Weather Service: \u003Ca href=\u0022https:\/\/www.weather.gov\/afc\/\u0022\u003Ehttps:\/\/www.weather.gov\/afc\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of airborne ash hazard to aircraft: https:\/\/www.weather.gov\/aawu\/. Volcanic Ash Advisories: \u003Ca href=\u0022https:\/\/www.weather.gov\/vaac\/\u0022\u003Ehttps:\/\/www.weather.gov\/vaac\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of ashfall: \u003Ca href=\u0022http:\/\/www.weather.gov\/afc\u0022\u003Ehttp:\/\/www.weather.gov\/afc\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EAir quality hazards and guidance from Alaska Department of Environmental Conservation, Division of Air Quality: \u003Ca href=\u0022http:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u0022\u003Ehttp:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u003C\/a\u003E\u003C\/p\u003E\u003C\/span\u003E\n            \u003Cbr\/\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EContacts:\u003C\/b\u003E \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\u003EStrong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and are carrying it to the southeast. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 6,000 ft (1.8 km) above sea level.\u003C\/p\u003E\u003Cp\u003EThis phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. All of the volcanoes of the Katmai area (Griggs, Katmai, Novarupta, Mageik, Martin, Snowy and Trident) remain at Aviation Color Code GREEN and Alert Level NORMAL. Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health.\u003C\/p\u003E\u003Cp\u003EFor more information on volcanic ash and human health, visit the following website: \u003Ca href=\u0022http:\/\/volcanoes.usgs.gov\/ash\/\u0022\u003Ehttp:\/\/volcanoes.usgs.gov\/ash\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EOfficial warnings about these ash resuspension events are issued by the National Weather Service: \u003Ca href=\u0022https:\/\/www.weather.gov\/afc\/\u0022\u003Ehttps:\/\/www.weather.gov\/afc\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of airborne ash hazard to aircraft: https:\/\/www.weather.gov\/aawu\/. Volcanic Ash Advisories: \u003Ca href=\u0022https:\/\/www.weather.gov\/vaac\/\u0022\u003Ehttps:\/\/www.weather.gov\/vaac\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of ashfall: \u003Ca href=\u0022http:\/\/www.weather.gov\/afc\u0022\u003Ehttp:\/\/www.weather.gov\/afc\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EAir quality hazards and guidance from Alaska Department of Environmental Conservation, Division of Air Quality: \u003Ca href=\u0022http:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u0022\u003Ehttp:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u003C\/a\u003E\u003C\/p\u003E","synopsis":"AVO Katmai GREEN\/NORMAL - Resuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN\/NORMAL.","alertLevel":"NORMAL","colorCode":"GREEN","vName":"Katmai","vnum":"312170","lat":58.279,"lng":-154.9533,"vUrl":"https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Katmai","vImage":"https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107821287_75_3.jpg","region":"Alaska Peninsula","sectionId":"DOI-USGS-AVO-2026-03-06T00:26:58+00:00"},{"sectionHtml":"\u003Ch4\u003EVOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)\u003C\/h4\u003E\u003Cpre\u003EWMAK01 PAVO 250019   \nVONA\nDTG:                    20260725\/0019Z\nVOLCANO:                KATMAI 312170\nPSN:                    N5817 W15457\nAREA:                   ALASKA\nSOURCE ELEV:            6716FT AMSL\nNOTICE NR:              2026\/03\nCURRENT COLOUR CODE:    GREEN\nPREVIOUS COLOUR CODE:   GREEN\nSVO:                    ALASKA VOLCANO OBSERVATORY\nACT STS:                RE-SUSPENDED VA\nONSET:                  NIL\nDUR:                    NIL\nVA CLD HGT:             6000FT AMSL\nHGT SOURCE:             SIGMET\nMOV:                    SE\nCTC:                    AVO DUTY SCIENTIST TEL +1-907-786-7497\nRMK:                    NO ERUPTION. RESUSPENDED VA FROM GND LEVEL ONLY. SEE SIGMET FOR MORE INFO.\nNXT NOTICE:             A NEW VONA WILL BE ISSUED IF COND CHANGE SIGNIFICANTLY OR IF THE COLOR CODE CHANGES\nNNNN\u003C\/pre\u003E","summary":"\u003Cp\u003EStrong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and are carrying it to the southeast. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 6,000 ft (1.8 km) above sea level.\u003C\/p\u003E\u003Cp\u003EThis phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. All of the volcanoes of the Katmai area (Griggs, Katmai, Novarupta, Mageik, Martin, Snowy and Trident) remain at Aviation Color Code GREEN and Alert Level NORMAL. Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health.\u003C\/p\u003E\u003Cp\u003EFor more information on volcanic ash and human health, visit the following website: \u003Ca href=\u0022http:\/\/volcanoes.usgs.gov\/ash\/\u0022\u003Ehttp:\/\/volcanoes.usgs.gov\/ash\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EOfficial warnings about these ash resuspension events are issued by the National Weather Service: \u003Ca href=\u0022https:\/\/www.weather.gov\/afc\/\u0022\u003Ehttps:\/\/www.weather.gov\/afc\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of airborne ash hazard to aircraft: https:\/\/www.weather.gov\/aawu\/. Volcanic Ash Advisories: \u003Ca href=\u0022https:\/\/www.weather.gov\/vaac\/\u0022\u003Ehttps:\/\/www.weather.gov\/vaac\/\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EForecasts of ashfall: \u003Ca href=\u0022http:\/\/www.weather.gov\/afc\u0022\u003Ehttp:\/\/www.weather.gov\/afc\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EAir quality hazards and guidance from Alaska Department of Environmental Conservation, Division of Air Quality: \u003Ca href=\u0022http:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u0022\u003Ehttp:\/\/dec.alaska.gov\/Applications\/Air\/airtoolsweb\/Advisories\/Index\u003C\/a\u003E\u003C\/p\u003E","synopsis":"AVO Katmai GREEN\/NORMAL - Resuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN\/NORMAL.","alertLevel":"NORMAL","colorCode":"GREEN","vName":"Katmai","vnum":"312170","lat":58.279,"lng":-154.9533,"vUrl":"https:\/\/avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Katmai","vImage":"https:\/\/avo.alaska.edu\/images\/dbimages\/display\/1107821287_75_3.jpg","region":"Alaska Peninsula","sectionId":"DOI-USGS-AVO-2026-03-06T00:26:58+00:00"}]},{"noticeTitle":"CALIFORNIA VOLCANO OBSERVATORY WEEKLY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003ECALIFORNIA VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ETuesday, July 21, 2026, 10:17 AM PDT (Tuesday, July 21, 2026, 17:17 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 July 13 (0000h PDT) to July 19 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 85 earthquakes greater than M1 were recorded, with the largest having a magnitude of M3.1.\u003Cbr\u003E\u003Cbr\u003EThree earthquakes greater than M1 were recorded in the Long Valley Caldera, with the largest having a magnitude of M1.8.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with a magnitude of M1.5.\u003Cbr\u003E\u003Cbr\u003EFive earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M2.7.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ECalVO's Weekly Update only highlights volcanoes which have experienced seismic activity or volcanic unrest. If there are no comments for a volcano, CalVO has detected no earthquakes with magnitudes greater than or equal to M1.0, or any other kind of unrest. Only earthquakes with magnitudes greater than M1.0 are reported here.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThese earthquake counts are preliminary and subject to change as the earthquakes are reviewed by seismologists. The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u003C\/a\u003E. \u003Cbr\u003E\u003Cbr\u003EAs part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory monitors the volcanoes of California and Nevada and advances scientific understanding of volcanic processes in order to reduce the harmful impacts of volcanic activity. For additional USGS CalVO volcano information, background, images, and other graphics visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/calvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/calvo\u003C\/a\u003E. For general information on the USGS Volcano Hazard Program visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u0022\u003Ehttps:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u003C\/a\u003E. Statewide seismic information for California and Nevada can be found at \u003Ca href=\u0022https:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u0022\u003Ehttps:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u003C\/a\u003E.\u003Cbr\u003E\u003Cbr\u003E \u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022mailto:askCalVO@usgs.gov\u0022\u003EaskCalVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E","sentUtc":"2026-07-21","obs":"calvo","noticeId":"DOI-USGS-CALVO-2026-07-21T17:11:26+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-CALVO-2026-07-21T17:11:26+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-CALVO-2026-07-21T17:11:26+00:00","obsAlertLevel":"NORMAL","obsColorCode":"GREEN","noticeHighestAlertLevel":"UNASSIGNED","noticeHighestColorCode":"UNASSIGNED","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003ECALIFORNIA VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003ETuesday, July 21, 2026, 10:17 AM PDT (Tuesday, July 21, 2026, 17:17 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 July 13 (0000h PDT) to July 19 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 85 earthquakes greater than M1 were recorded, with the largest having a magnitude of M3.1.\u003Cbr\u003E\u003Cbr\u003EThree earthquakes greater than M1 were recorded in the Long Valley Caldera, with the largest having a magnitude of M1.8.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with a magnitude of M1.5.\u003Cbr\u003E\u003Cbr\u003EFive earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M2.7.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ECalVO's Weekly Update only highlights volcanoes which have experienced seismic activity or volcanic unrest. If there are no comments for a volcano, CalVO has detected no earthquakes with magnitudes greater than or equal to M1.0, or any other kind of unrest. Only earthquakes with magnitudes greater than M1.0 are reported here.\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThese earthquake counts are preliminary and subject to change as the earthquakes are reviewed by seismologists. The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/alert-level-icons\u003C\/a\u003E. \u003Cbr\u003E\u003Cbr\u003EAs part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory monitors the volcanoes of California and Nevada and advances scientific understanding of volcanic processes in order to reduce the harmful impacts of volcanic activity. For additional USGS CalVO volcano information, background, images, and other graphics visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/calvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/calvo\u003C\/a\u003E. For general information on the USGS Volcano Hazard Program visit \u003Ca href=\u0022https:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u0022\u003Ehttps:\/\/www.usgs.gov\/natural-hazards\/volcano-hazards\/\u003C\/a\u003E. Statewide seismic information for California and Nevada can be found at \u003Ca href=\u0022https:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u0022\u003Ehttps:\/\/earthquake.usgs.gov\/earthquakes\/map\/\u003C\/a\u003E.\u003Cbr\u003E\u003Cbr\u003E \u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022mailto:askCalVO@usgs.gov\u0022\u003EaskCalVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E","summary":"\u003Cp\u003E\u003Cstrong\u003EMonitored CALIFORNIA VOLCANOES\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Volcano Alert Level: all NORMAL\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003ECurrent Aviation Color Code: all GREEN\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EActivity Update: \u003C\/strong\u003EAll volcanoes monitored by CalVO show normal background earthquake activity and deformation. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPast Week Observations for July 13 (0000h PDT) to July 19 (2359h PDT):\u003C\/strong\u003E\u003Cbr\u003E\u003Cbr\u003ETypical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 85 earthquakes greater than M1 were recorded, with the largest having a magnitude of M3.1.\u003Cbr\u003E\u003Cbr\u003EThree earthquakes greater than M1 were recorded in the Long Valley Caldera, with the largest having a magnitude of M1.8.\u003Cbr\u003E\u003Cbr\u003EOne earthquake greater than M1 was recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with a magnitude of M1.5.\u003Cbr\u003E\u003Cbr\u003EFive earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M2.7.\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-2026-07-21T17:11:26+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, July 24, 2026, 1:16 PM PDT (Friday, July 24, 2026, 20:16 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 Oregon and Washington are at normal background activity levels. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EPast Week Observations\u003C\/strong\u003E: During the past week, small earthquakes were detected at Mount St. Helens and Mount Rainier. All monitoring data are consistent with background activity levels in the Cascade Range. On the evening of July 22, sensors recorded a minor debris flow in the Kautz Creek at Mount Rainier. We infer that the debris flow was likely initiated due to a passing thunderstorm and that it is unlikely that it reached the Nisqually River. Field crews conducted station maintenance at Mount Baker and Mount Rainier.\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":"2026-07-24","obs":"cvo","noticeId":"DOI-USGS-CVO-2026-07-24T18:48:43+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-CVO-2026-07-24T18:48:43+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-CVO-2026-07-24T18:48:43+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\u003ECASCADES VOLCANO OBSERVATORY WEEKLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, July 24, 2026, 1:16 PM PDT (Friday, July 24, 2026, 20:16 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 Oregon and Washington are at normal background activity levels. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EPast Week Observations\u003C\/strong\u003E: During the past week, small earthquakes were detected at Mount St. Helens and Mount Rainier. All monitoring data are consistent with background activity levels in the Cascade Range. On the evening of July 22, sensors recorded a minor debris flow in the Kautz Creek at Mount Rainier. We infer that the debris flow was likely initiated due to a passing thunderstorm and that it is unlikely that it reached the Nisqually River. Field crews conducted station maintenance at Mount Baker and Mount Rainier.\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 Oregon and Washington are at normal background activity levels. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EPast Week Observations\u003C\/strong\u003E: During the past week, small earthquakes were detected at Mount St. Helens and Mount Rainier. All monitoring data are consistent with background activity levels in the Cascade Range. On the evening of July 22, sensors recorded a minor debris flow in the Kautz Creek at Mount Rainier. We infer that the debris flow was likely initiated due to a passing thunderstorm and that it is unlikely that it reached the Nisqually River. Field crews conducted station maintenance at Mount Baker and Mount Rainier.\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-2026-07-24T18:48:43+00:00"}]},{"noticeTitle":"HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EHAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, July 24, 2026, 9:04 AM HST (Friday, July 24, 2026, 19:04 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EKILAUEA\u003C\/b\u003E (VNUM #332010)\u003Cbr\/\u003E19\u00b025'16\u0022 N 155\u00b017'13\u0022 W, Summit Elevation 4091 ft (1247 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E The Halema\u02bbuma\u02bbu eruption is paused. The next fountain episode is likely between July 26 and July 30.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EOverview:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe summit eruption of K\u012blauea in Halema\u02bbuma\u02bbu is paused. Summit inflation paused around 9 p.m. H.S.T. last night, with minor deflation starting around midnight and continuing. South vent had intermittent glow last night, while north vent had strong persistent glow which weakened starting around 3 a.m. H.S.T. this morning. These observations have pushed back the modeled forecast time window for episode 52 fountains to between July 26 and July 30.  \u003C\/p\u003E\u003Cp\u003ENo significant activity has been noted along K\u012blauea\u2019s East Rift Zone or Southwest Rift Zone.\u003C\/p\u003E\u003Cp\u003EA summary of episode 51 is posted below.\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 \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDegassing continues from both north and south vents .South vent had intermittent glow overnight, while north vent had strong persistent glow which weakened starting around 3 a.m. H.S.T. this morning.\u003C\/p\u003E\u003Cp\u003ETremor last night was punctuated by more frequent drops in intensity followed by spikes in tremor typical of gas pistoning. The tremor spikes correlate with periods of brighter glow and occasionally flames from the south vent, presumably due to drainback events. One earthquake was located beneath the summit of K\u012blauea summit in the past 24 hours. \u003C\/p\u003E\u003Cp\u003ESince episode 51 ended, inflation resumed and has recovered 12.0 microradians of tilt at the summit tiltmeter at U\u0113kahuna (UWD). After nearly two days of steady inflation, inflation paused around 9 p.m. H.S.T. last night, with deflation starting around midnight and continuing. Despite the deflation, in the last 24 hours UWD has recorded a net gain of 0.9 microradians. K\u012blauea summit deflation totaled 14.7 microradians during episode 51.\u003C\/p\u003E\u003Cp\u003EThe sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rate from the summit is likely now varying within a typical range of 1,000 to 5,000 tonnes per day. Degassing plumes from both vents are being blown toward the southwest this morning.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERift Zone Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ERates of seismicity and ground deformation remain low in the East Rift Zone and Southwest Rift Zone. SO\u003Csub\u003E2\u003C\/sub\u003E emissions from the East Rift Zone remain below the detection limit.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis\u003C\/strong\u003E:\u003C\/p\u003E\u003Cp\u003EThe abrupt switch from summit deflation to inflation at the end of episode 51 along with continued glow from the vents indicates that another fountaining episode is likely. Inflation since the end of episode 51 was relatively smooth without significant deflations until very early on Tuesday, July 21, when inflation paused and was flat for over a day. Inflation resumed Wednesday July 22 in the morning, and then paused last night (July 23), with minor deflation starting around midnight. As of this morning, inflation-based models have pushed the forecast window for the start of episode 52 fountains a day later to July 26 through July 30. Future periods of slow inflation or deflation may cause the forecast window to be adjusted.\u003C\/p\u003E\u003Cp\u003EK\u012blauea has been erupting episodically since December 23, 2024, from two vents (north and south) in Halema\u2018uma\u2018u. Lava fountaining episodes, which generally last for less than 12 hours, are separated by pauses that can be longer than three weeks.\u003C\/p\u003E\u003Cp\u003EHVO continues to closely monitor K\u012blauea and is in contact with Hawai\u2018i Volcanoes National Park and the Hawai\u2018i County Civil Defense Agency about eruptive hazards.\u003C\/p\u003E\u003Cp\u003EPlease see the Hawai\u02bbi Volcanoes National Park website for visitor information: \u003Ca href=\u0022https:\/\/www.nps.gov\/havo\/index.htm\u0022\u003Ehttps:\/\/www.nps.gov\/havo\/index.htm\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummary of episode 51:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EA detailed account of episode 51 is given in the HVO Status Report issued on July 15: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-07-16T03:55:25+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-07-16T03:55:25+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEpisode 51 of the ongoing Halema\u02bbuma\u02bbu eruption began around 8:30 a.m. HST on July 15 and ended abruptly at 4:46 p.m. HST on July 15, 2026.\u003C\/li\u003E\u003Cli\u003EThe maximum lava fountain height was approximately 950 feet (290 meters) above ground level from the north vent. The south vent never fountained during this episode but did emit flames and gas jets.\u003C\/li\u003E\u003Cli\u003EThe maximum plume height was approximately 18,000 (5,500 meters) above mean sea level.\u003C\/li\u003E\u003Cli\u003ETephra fall was restricted mostly to the closed area of Hawai\u02bbi Volcanoes National Park to the southwest of the active Halema\u02bbuma\u02bbu vents. A light fall of Pele\u02bbs hair was reported at several sites in the national park outside the closed area, including U\u0113kahuna overlook and Ka\u02bbu Desert trailhead on Highway 11.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E\u003Cstrong\u003EResources:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ENOTE: HVO\u2019s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations, including the SDH tiltmeter, will remain offline until we are able to re-establish access across the deep tephra field southwest of the caldera.\u003C\/p\u003E\u003Cp\u003EThe following links provide more information about the current eruption that began on December 23, 2024:\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEruption resources, including the most recent map and a timeline of eruption episodes since December 23, 2024: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EShort messages tracking the evolution of the lava fountains and eruptive activity can be found here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EThree K\u012blauea summit livestream cameras that show eruptive lava fountains are available here: \u003Ca href=\u0022https:\/\/www.youtube.com\/@usgs\/streams\u0022\u003Ehttps:\/\/www.youtube.com\/@usgs\/streams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ESummit eruption webcams:\u003Ca href=\u0022 https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u0022\u003E https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EVolcano Watch article on gas pistons: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHazards:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThis episodic eruption is occurring within a closed area of Hawai'i Volcanoes National Park.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EVolcanic Gas: high levels of volcanic gas\u2014primarily water vapor (H\u003Csub\u003E2\u003C\/sub\u003EO), carbon dioxide (CO\u003Csub\u003E2\u003C\/sub\u003E), and sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E)\u2014are continually released during an eruption. Emissions can remain locally hazardous in the areas immediately downwind of the vents, even when the vents are not actively erupting. SO\u003Csub\u003E2\u003C\/sub\u003E\u202freacts in the atmosphere to create vog (volcanic air pollution) downwind. SO\u003Csub\u003E2\u003C\/sub\u003E and vog may cause respiratory and other problems at high concentrations. Further information on vog can be found at\u202f\u003Ca href=\u0022https:\/\/vog.ivhhn.org\/\u0022\u003Ehttps:\/\/vog.ivhhn.org\/\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ETephra: small glassy volcanic fragments\u2014volcanic ash, pumice, scoria, Pele\u2019s hair and reticulite\u2014are created by the lava fountains. A combination of fountaining dynamics and wind conditions determines where tephra fall may occur for any given eruption episode. Larger particles fall near the vents while light particles may be wafted greater distances. These particles may be remobilized during windy conditions following recent eruptive episodes. Residents and visitors should minimize exposure to these fragments, which can cause skin, eye, and respiratory irritation. More information and guidance on tephra fall hazards is available at \u003Ca href=\u0022https:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u0022\u003Ehttps:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ELava flows: lava on the floor of Halema\u02bbuma\u02bbu crater and the southwest side of Kaluapele, K\u012blauea's summit caldera, remains hot and may slowly move in the days immediately following an eruptive episode.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EOther significant hazards exist around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes. Close to the eruptive vents, the tephra material on the crater rim is prone to cracking, slumping, and small landslides that sometimes expose hot and molten material within. This underscores the extremely hazardous nature of\u202fK\u012blauea's caldera rim surrounding Halema\u02bbuma\u02bbu\u202fcrater, an area that has been closed to the public since late 2007.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\u003Cstrong\u003EMore Information:\u003C\/strong\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EK\u012blauea activity summary also available by phone: \u003Ca href=\u0022tel:(808) 967-8862\u0022\u003E(808) 967-8862\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea webcam images: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea photos\/video: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/photo-and-video-chronology\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/photo-and-video-chronology\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea lava-flow maps: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea FAQs: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThe Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai\u02bbi and American Samoa.\u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022mailto:askHVO@usgs.gov\u0022\u003EaskHVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ESubscribe to these messages: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/vns2\/\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/vns2\/\u003C\/a\u003E\u003Cbr\u003ESummary of volcanic hazards from eruptions: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/hazards\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/hazards\u003C\/a\u003E\u003Cbr\u003ERecent earthquakes in Hawai\u02bbi (map and list): \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\u003C\/a\u003E\u003Cbr\u003EExplanation of Volcano Alert Levels and Aviation Color Codes: \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u003C\/a\u003E\u003C\/p\u003E","sentUtc":"2026-07-24","obs":"hvo","noticeId":"DOI-USGS-HVO-2026-07-24T18:32:47+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-HVO-2026-07-24T18:32:47+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-HVO-2026-07-24T18:32:47+00:00","obsAlertLevel":"ADVISORY","obsColorCode":"YELLOW","noticeHighestAlertLevel":"ADVISORY","noticeHighestColorCode":"YELLOW","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EHAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EFriday, July 24, 2026, 9:04 AM HST (Friday, July 24, 2026, 19:04 UTC)\u003C\/b\u003E\n                \u003C\/p\u003E\n            \u003C\/center\u003E\n            \u003Cbr\/\u003E\n            \u003Cb\u003EKILAUEA\u003C\/b\u003E (VNUM #332010)\u003Cbr\/\u003E19\u00b025'16\u0022 N 155\u00b017'13\u0022 W, Summit Elevation 4091 ft (1247 m)\u003Cbr\/\u003ECurrent Volcano Alert Level: ADVISORY\u003Cbr\/\u003ECurrent Aviation Color Code: YELLOW\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022synopsis\u0022\u003E\u003Cb\u003ESummary:\u003C\/b\u003E The Halema\u02bbuma\u02bbu eruption is paused. The next fountain episode is likely between July 26 and July 30.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EOverview:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe summit eruption of K\u012blauea in Halema\u02bbuma\u02bbu is paused. Summit inflation paused around 9 p.m. H.S.T. last night, with minor deflation starting around midnight and continuing. South vent had intermittent glow last night, while north vent had strong persistent glow which weakened starting around 3 a.m. H.S.T. this morning. These observations have pushed back the modeled forecast time window for episode 52 fountains to between July 26 and July 30.  \u003C\/p\u003E\u003Cp\u003ENo significant activity has been noted along K\u012blauea\u2019s East Rift Zone or Southwest Rift Zone.\u003C\/p\u003E\u003Cp\u003EA summary of episode 51 is posted below.\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 \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDegassing continues from both north and south vents .South vent had intermittent glow overnight, while north vent had strong persistent glow which weakened starting around 3 a.m. H.S.T. this morning.\u003C\/p\u003E\u003Cp\u003ETremor last night was punctuated by more frequent drops in intensity followed by spikes in tremor typical of gas pistoning. The tremor spikes correlate with periods of brighter glow and occasionally flames from the south vent, presumably due to drainback events. One earthquake was located beneath the summit of K\u012blauea summit in the past 24 hours. \u003C\/p\u003E\u003Cp\u003ESince episode 51 ended, inflation resumed and has recovered 12.0 microradians of tilt at the summit tiltmeter at U\u0113kahuna (UWD). After nearly two days of steady inflation, inflation paused around 9 p.m. H.S.T. last night, with deflation starting around midnight and continuing. Despite the deflation, in the last 24 hours UWD has recorded a net gain of 0.9 microradians. K\u012blauea summit deflation totaled 14.7 microradians during episode 51.\u003C\/p\u003E\u003Cp\u003EThe sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rate from the summit is likely now varying within a typical range of 1,000 to 5,000 tonnes per day. Degassing plumes from both vents are being blown toward the southwest this morning.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERift Zone Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ERates of seismicity and ground deformation remain low in the East Rift Zone and Southwest Rift Zone. SO\u003Csub\u003E2\u003C\/sub\u003E emissions from the East Rift Zone remain below the detection limit.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis\u003C\/strong\u003E:\u003C\/p\u003E\u003Cp\u003EThe abrupt switch from summit deflation to inflation at the end of episode 51 along with continued glow from the vents indicates that another fountaining episode is likely. Inflation since the end of episode 51 was relatively smooth without significant deflations until very early on Tuesday, July 21, when inflation paused and was flat for over a day. Inflation resumed Wednesday July 22 in the morning, and then paused last night (July 23), with minor deflation starting around midnight. As of this morning, inflation-based models have pushed the forecast window for the start of episode 52 fountains a day later to July 26 through July 30. Future periods of slow inflation or deflation may cause the forecast window to be adjusted.\u003C\/p\u003E\u003Cp\u003EK\u012blauea has been erupting episodically since December 23, 2024, from two vents (north and south) in Halema\u2018uma\u2018u. Lava fountaining episodes, which generally last for less than 12 hours, are separated by pauses that can be longer than three weeks.\u003C\/p\u003E\u003Cp\u003EHVO continues to closely monitor K\u012blauea and is in contact with Hawai\u2018i Volcanoes National Park and the Hawai\u2018i County Civil Defense Agency about eruptive hazards.\u003C\/p\u003E\u003Cp\u003EPlease see the Hawai\u02bbi Volcanoes National Park website for visitor information: \u003Ca href=\u0022https:\/\/www.nps.gov\/havo\/index.htm\u0022\u003Ehttps:\/\/www.nps.gov\/havo\/index.htm\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummary of episode 51:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EA detailed account of episode 51 is given in the HVO Status Report issued on July 15: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-07-16T03:55:25+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-07-16T03:55:25+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEpisode 51 of the ongoing Halema\u02bbuma\u02bbu eruption began around 8:30 a.m. HST on July 15 and ended abruptly at 4:46 p.m. HST on July 15, 2026.\u003C\/li\u003E\u003Cli\u003EThe maximum lava fountain height was approximately 950 feet (290 meters) above ground level from the north vent. The south vent never fountained during this episode but did emit flames and gas jets.\u003C\/li\u003E\u003Cli\u003EThe maximum plume height was approximately 18,000 (5,500 meters) above mean sea level.\u003C\/li\u003E\u003Cli\u003ETephra fall was restricted mostly to the closed area of Hawai\u02bbi Volcanoes National Park to the southwest of the active Halema\u02bbuma\u02bbu vents. A light fall of Pele\u02bbs hair was reported at several sites in the national park outside the closed area, including U\u0113kahuna overlook and Ka\u02bbu Desert trailhead on Highway 11.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E\u003Cstrong\u003EResources:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ENOTE: HVO\u2019s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations, including the SDH tiltmeter, will remain offline until we are able to re-establish access across the deep tephra field southwest of the caldera.\u003C\/p\u003E\u003Cp\u003EThe following links provide more information about the current eruption that began on December 23, 2024:\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEruption resources, including the most recent map and a timeline of eruption episodes since December 23, 2024: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EShort messages tracking the evolution of the lava fountains and eruptive activity can be found here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EThree K\u012blauea summit livestream cameras that show eruptive lava fountains are available here: \u003Ca href=\u0022https:\/\/www.youtube.com\/@usgs\/streams\u0022\u003Ehttps:\/\/www.youtube.com\/@usgs\/streams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ESummit eruption webcams:\u003Ca href=\u0022 https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u0022\u003E https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EVolcano Watch article on gas pistons: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHazards:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThis episodic eruption is occurring within a closed area of Hawai'i Volcanoes National Park.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EVolcanic Gas: high levels of volcanic gas\u2014primarily water vapor (H\u003Csub\u003E2\u003C\/sub\u003EO), carbon dioxide (CO\u003Csub\u003E2\u003C\/sub\u003E), and sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E)\u2014are continually released during an eruption. Emissions can remain locally hazardous in the areas immediately downwind of the vents, even when the vents are not actively erupting. SO\u003Csub\u003E2\u003C\/sub\u003E\u202freacts in the atmosphere to create vog (volcanic air pollution) downwind. SO\u003Csub\u003E2\u003C\/sub\u003E and vog may cause respiratory and other problems at high concentrations. Further information on vog can be found at\u202f\u003Ca href=\u0022https:\/\/vog.ivhhn.org\/\u0022\u003Ehttps:\/\/vog.ivhhn.org\/\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ETephra: small glassy volcanic fragments\u2014volcanic ash, pumice, scoria, Pele\u2019s hair and reticulite\u2014are created by the lava fountains. A combination of fountaining dynamics and wind conditions determines where tephra fall may occur for any given eruption episode. Larger particles fall near the vents while light particles may be wafted greater distances. These particles may be remobilized during windy conditions following recent eruptive episodes. Residents and visitors should minimize exposure to these fragments, which can cause skin, eye, and respiratory irritation. More information and guidance on tephra fall hazards is available at \u003Ca href=\u0022https:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u0022\u003Ehttps:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ELava flows: lava on the floor of Halema\u02bbuma\u02bbu crater and the southwest side of Kaluapele, K\u012blauea's summit caldera, remains hot and may slowly move in the days immediately following an eruptive episode.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EOther significant hazards exist around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes. Close to the eruptive vents, the tephra material on the crater rim is prone to cracking, slumping, and small landslides that sometimes expose hot and molten material within. This underscores the extremely hazardous nature of\u202fK\u012blauea's caldera rim surrounding Halema\u02bbuma\u02bbu\u202fcrater, an area that has been closed to the public since late 2007.\u003C\/p\u003E\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003E\u003Cstrong\u003EMore Information:\u003C\/strong\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EK\u012blauea activity summary also available by phone: \u003Ca href=\u0022tel:(808) 967-8862\u0022\u003E(808) 967-8862\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea webcam images: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea photos\/video: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/photo-and-video-chronology\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/photo-and-video-chronology\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea lava-flow maps: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/maps\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EK\u012blauea FAQs: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/faqs\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003EThe Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai\u02bbi and American Samoa.\u003C\/p\u003E               \n                \u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cb\u003ECONTACT INFORMATION:\u003C\/b\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\n                \u003Cp\u003E\u003Ca href=\u0022mailto:askHVO@usgs.gov\u0022\u003EaskHVO@usgs.gov\u003C\/a\u003E\u003C\/p\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cp\u003ESubscribe to these messages: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/vns2\/\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/vns2\/\u003C\/a\u003E\u003Cbr\u003ESummary of volcanic hazards from eruptions: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/hazards\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/hazards\u003C\/a\u003E\u003Cbr\u003ERecent earthquakes in Hawai\u02bbi (map and list): \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\u003C\/a\u003E\u003Cbr\u003EExplanation of Volcano Alert Levels and Aviation Color Codes: \u003Ca href=\u0022https:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u0022\u003Ehttps:\/\/www.usgs.gov\/programs\/VHP\/volcanic-alert-levels-characterize-conditions-us-volcanoes\u003C\/a\u003E\u003C\/p\u003E","summary":"\u003Cp\u003E\u003Cstrong\u003EOverview:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe summit eruption of K\u012blauea in Halema\u02bbuma\u02bbu is paused. Summit inflation paused around 9 p.m. H.S.T. last night, with minor deflation starting around midnight and continuing. South vent had intermittent glow last night, while north vent had strong persistent glow which weakened starting around 3 a.m. H.S.T. this morning. These observations have pushed back the modeled forecast time window for episode 52 fountains to between July 26 and July 30.  \u003C\/p\u003E\u003Cp\u003ENo significant activity has been noted along K\u012blauea\u2019s East Rift Zone or Southwest Rift Zone.\u003C\/p\u003E\u003Cp\u003EA summary of episode 51 is posted below.\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 \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummit Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDegassing continues from both north and south vents .South vent had intermittent glow overnight, while north vent had strong persistent glow which weakened starting around 3 a.m. H.S.T. this morning.\u003C\/p\u003E\u003Cp\u003ETremor last night was punctuated by more frequent drops in intensity followed by spikes in tremor typical of gas pistoning. The tremor spikes correlate with periods of brighter glow and occasionally flames from the south vent, presumably due to drainback events. One earthquake was located beneath the summit of K\u012blauea summit in the past 24 hours. \u003C\/p\u003E\u003Cp\u003ESince episode 51 ended, inflation resumed and has recovered 12.0 microradians of tilt at the summit tiltmeter at U\u0113kahuna (UWD). After nearly two days of steady inflation, inflation paused around 9 p.m. H.S.T. last night, with deflation starting around midnight and continuing. Despite the deflation, in the last 24 hours UWD has recorded a net gain of 0.9 microradians. K\u012blauea summit deflation totaled 14.7 microradians during episode 51.\u003C\/p\u003E\u003Cp\u003EThe sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E) emission rate from the summit is likely now varying within a typical range of 1,000 to 5,000 tonnes per day. Degassing plumes from both vents are being blown toward the southwest this morning.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERift Zone Observations:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ERates of seismicity and ground deformation remain low in the East Rift Zone and Southwest Rift Zone. SO\u003Csub\u003E2\u003C\/sub\u003E emissions from the East Rift Zone remain below the detection limit.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAnalysis\u003C\/strong\u003E:\u003C\/p\u003E\u003Cp\u003EThe abrupt switch from summit deflation to inflation at the end of episode 51 along with continued glow from the vents indicates that another fountaining episode is likely. Inflation since the end of episode 51 was relatively smooth without significant deflations until very early on Tuesday, July 21, when inflation paused and was flat for over a day. Inflation resumed Wednesday July 22 in the morning, and then paused last night (July 23), with minor deflation starting around midnight. As of this morning, inflation-based models have pushed the forecast window for the start of episode 52 fountains a day later to July 26 through July 30. Future periods of slow inflation or deflation may cause the forecast window to be adjusted.\u003C\/p\u003E\u003Cp\u003EK\u012blauea has been erupting episodically since December 23, 2024, from two vents (north and south) in Halema\u2018uma\u2018u. Lava fountaining episodes, which generally last for less than 12 hours, are separated by pauses that can be longer than three weeks.\u003C\/p\u003E\u003Cp\u003EHVO continues to closely monitor K\u012blauea and is in contact with Hawai\u2018i Volcanoes National Park and the Hawai\u2018i County Civil Defense Agency about eruptive hazards.\u003C\/p\u003E\u003Cp\u003EPlease see the Hawai\u02bbi Volcanoes National Park website for visitor information: \u003Ca href=\u0022https:\/\/www.nps.gov\/havo\/index.htm\u0022\u003Ehttps:\/\/www.nps.gov\/havo\/index.htm\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESummary of episode 51:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EA detailed account of episode 51 is given in the HVO Status Report issued on July 15: \u003Ca href=\u0022https:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-07-16T03:55:25+00:00\u0022\u003Ehttps:\/\/volcanoes.usgs.gov\/hans-public\/notice\/DOI-USGS-HVO-2026-07-16T03:55:25+00:00\u003C\/a\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEpisode 51 of the ongoing Halema\u02bbuma\u02bbu eruption began around 8:30 a.m. HST on July 15 and ended abruptly at 4:46 p.m. HST on July 15, 2026.\u003C\/li\u003E\u003Cli\u003EThe maximum lava fountain height was approximately 950 feet (290 meters) above ground level from the north vent. The south vent never fountained during this episode but did emit flames and gas jets.\u003C\/li\u003E\u003Cli\u003EThe maximum plume height was approximately 18,000 (5,500 meters) above mean sea level.\u003C\/li\u003E\u003Cli\u003ETephra fall was restricted mostly to the closed area of Hawai\u02bbi Volcanoes National Park to the southwest of the active Halema\u02bbuma\u02bbu vents. A light fall of Pele\u02bbs hair was reported at several sites in the national park outside the closed area, including U\u0113kahuna overlook and Ka\u02bbu Desert trailhead on Highway 11.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E\u003Cstrong\u003EResources:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ENOTE: HVO\u2019s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations, including the SDH tiltmeter, will remain offline until we are able to re-establish access across the deep tephra field southwest of the caldera.\u003C\/p\u003E\u003Cp\u003EThe following links provide more information about the current eruption that began on December 23, 2024:\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EEruption resources, including the most recent map and a timeline of eruption episodes since December 23, 2024: \u003Ca href=\u0022https:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u0022\u003Ehttps:\/\/www.usgs.gov\/volcanoes\/kilauea\/science\/eruption-information\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EShort messages tracking the evolution of the lava fountains and eruptive activity can be found here: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/observatory-messages\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EThree K\u012blauea summit livestream cameras that show eruptive lava fountains are available here: \u003Ca href=\u0022https:\/\/www.youtube.com\/@usgs\/streams\u0022\u003Ehttps:\/\/www.youtube.com\/@usgs\/streams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ESummit eruption webcams:\u003Ca href=\u0022 https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u0022\u003E https:\/\/www.usgs.gov\/volcanoes\/kilauea\/summit-webcams\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003EVolcano Watch article on gas pistons: \u003Ca href=\u0022https:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u0022\u003Ehttps:\/\/www.usgs.gov\/observatories\/hvo\/news\/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHazards:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThis episodic eruption is occurring within a closed area of Hawai'i Volcanoes National Park.\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EVolcanic Gas: high levels of volcanic gas\u2014primarily water vapor (H\u003Csub\u003E2\u003C\/sub\u003EO), carbon dioxide (CO\u003Csub\u003E2\u003C\/sub\u003E), and sulfur dioxide (SO\u003Csub\u003E2\u003C\/sub\u003E)\u2014are continually released during an eruption. Emissions can remain locally hazardous in the areas immediately downwind of the vents, even when the vents are not actively erupting. SO\u003Csub\u003E2\u003C\/sub\u003E\u202freacts in the atmosphere to create vog (volcanic air pollution) downwind. SO\u003Csub\u003E2\u003C\/sub\u003E and vog may cause respiratory and other problems at high concentrations. Further information on vog can be found at\u202f\u003Ca href=\u0022https:\/\/vog.ivhhn.org\/\u0022\u003Ehttps:\/\/vog.ivhhn.org\/\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ETephra: small glassy volcanic fragments\u2014volcanic ash, pumice, scoria, Pele\u2019s hair and reticulite\u2014are created by the lava fountains. A combination of fountaining dynamics and wind conditions determines where tephra fall may occur for any given eruption episode. Larger particles fall near the vents while light particles may be wafted greater distances. These particles may be remobilized during windy conditions following recent eruptive episodes. Residents and visitors should minimize exposure to these fragments, which can cause skin, eye, and respiratory irritation. More information and guidance on tephra fall hazards is available at \u003Ca href=\u0022https:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u0022\u003Ehttps:\/\/seagrant.soest.hawaii.edu\/resource-and-guidance-for-volcanic-tephra-fall\/\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003ELava flows: lava on the floor of Halema\u02bbuma\u02bbu crater and the southwest side of Kaluapele, K\u012blauea's summit caldera, remains hot and may slowly move in the days immediately following an eruptive episode.\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EOther significant hazards exist around\u202fK\u012blauea caldera\u202ffrom Halema\u02bbuma\u02bbu\u202fcrater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes. Close to the eruptive vents, the tephra material on the crater rim is prone to cracking, slumping, and small landslides that sometimes expose hot and molten material within. This underscores the extremely hazardous nature of\u202fK\u012blauea's caldera rim surrounding Halema\u02bbuma\u02bbu\u202fcrater, an area that has been closed to the public since late 2007.\u003C\/p\u003E","synopsis":"HVO Kilauea YELLOW\/ADVISORY - The Halema\u02bbuma\u02bbu eruption is paused. The next fountain episode is likely between July 26 and July 30.","alertLevel":"ADVISORY","colorCode":"YELLOW","vName":"Kilauea","vnum":"332010","lat":19.421,"lng":-155.287,"vUrl":"https:\/\/www.usgs.gov\/volcanoes\/kilauea","vImage":"https:\/\/volcanoes.usgs.gov\/vsc\/images\/kilauea\/kilauea.jpg","region":"Hawaii","sectionId":"DOI-USGS-HVO-2026-07-24T18:32:47+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, July 24, 2026, 9:43 AM ChST (Thursday, July 23, 2026, 23:43 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 marine plumes observed in satellite data this week.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ENothing was observed in satellite data at Ahyi Seamount this 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\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":"2026-07-23","obs":"nmi","noticeId":"DOI-USGS-NMI-2026-07-23T23:41:13+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-NMI-2026-07-23T23:41:13+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-NMI-2026-07-23T23:41:13+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, July 24, 2026, 9:43 AM ChST (Thursday, July 23, 2026, 23:43 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 marine plumes observed in satellite data this week.\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003ENothing was observed in satellite data at Ahyi Seamount this 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\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\u003ENothing was observed in satellite data at Ahyi Seamount this 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 marine plumes observed in satellite data this week.","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-2026-07-23T23:41:19+00:00"}]},{"noticeTitle":"YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE","noticeHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EYELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EWednesday, July 1, 2026, 11:49 AM MDT (Wednesday, July 1, 2026, 17:49 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\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EYellowstone Caldera activity remains at background levels, with 118 located earthquakes in June (largest = M2.4). Deformation measurements indicate no significant uplift or subsidence of the caldera or north caldera rim since January 2026.  A small hydrothermal explosion occurred in Biscuit Basin on June 13.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EA small hydrothermal explosion occurred in Biscuit Basin at about 5:09 a.m. MDT on June 13.  The event took place 30\u201360 meters (100\u2013200 feet) north of Black Diamond Pool and was well recorded by seismic and acoustic monitoring in the basin, and it threw rocks a few meters (tens of feet) into the air and discharged large amounts of sediment-rich hot water into the Firehole River, causing a temporary discoloration for many kilometers (miles) downstream.  The explosion opened several vent areas, some of which were full of near-boiling water when observed the following day, including a crack that was about 18 meters (60 feet) long.  A day or two after the explosion, a pool of boiling water formed by collapse.  That pool was observed to erupt like a geyser on June 18 and again on June 23.  Black Diamond Pool and other thermal features in Biscuit Basin were not impacted by the new hydrothermal activity, and Black Diamond Pool had at least two very small eruptions (about 1 meter, or 3 feet, in height) in late June.  Biscuit Basin has been closed to visitors since the July 23, 2024, hydrothermal explosion from Black Diamond Pool that destroyed a stretch of boardwalk in the basin.\u003C\/p\u003E\u003Cp\u003EEchinus Geyser, in Norris Geyser Basin, remained active, with one eruption in June.  In July, Yellowstone Volcano Observatory scientists plan to begin installation of a new monitoring station that will include seismic and infrasound sensors in Upper Geyser Basin.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring June 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 118 earthquakes in the Yellowstone National Park region. The largest event of the month was a microearthquake of magnitude 2.4 located about 12 miles south-southeast of Lake in Yellowstone National Park on June 7 at 5:52 a.m. MDT.\u003C\/p\u003E\u003Cp\u003EJune seismicity in Yellowstone was marked by three swarms:\u003C\/p\u003E\u003Cp\u003E1. A swarm of 25 earthquakes occurred about 12 miles south-southeast of Lake in Yellowstone National Park during June 6\u20139. The magnitudes ranged from M0.3 to M2.4. The largest earthquake in the sequence was also the largest in June (described above).\u003C\/p\u003E\u003Cp\u003E2. A swarm of 20 earthquakes took place approximately 12 miles north-northeast of West Yellowstone, Montana, during June 22\u201325. The range of magnitudes was M0.2\u20132.1.\u003C\/p\u003E\u003Cp\u003E3. A swarm of 16 small earthquakes occurred about 10 miles north-northeast of Old Faithful in Yellowstone National Park during June 14\u201315 and had magnitudes spanning the range M0.5\u20131.6.\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 in the region since January 2026.  The uplift that started in July 2025 on the north caldera rim ceased by mid-January 2026, and there has been no uplift or subsidence of Yellowstone Caldera since December 2025.\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":"2026-07-01","obs":"yvo","noticeId":"DOI-USGS-YVO-2026-07-01T17:25:56+00:00","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-YVO-2026-07-01T17:25:56+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-YVO-2026-07-01T17:25:56+00:00","obsAlertLevel":"NORMAL","obsColorCode":"GREEN","noticeHighestAlertLevel":"NORMAL","noticeHighestColorCode":"GREEN","noticeSections":[{"sectionHtml":"\u003Cbr\/\u003E\n            \u003Ccenter\u003E\n                \u003Cp class=\u0022text-center\u0022\u003E\n                    \u003Cb\u003EYELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE\u003C\/b\u003E\u003Cbr\/\u003E\n                    \u003Cb\u003EU.S. Geological Survey\u003C\/b\u003E\u003Cbr\/\u003E\n            \u003Cb\u003EWednesday, July 1, 2026, 11:49 AM MDT (Wednesday, July 1, 2026, 17:49 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\u003C\/span\u003E\u003Cbr\/\u003E\u003Cbr\/\u003E\u003Cspan name=\u0022summary\u0022\u003E\u003Cp\u003EYellowstone Caldera activity remains at background levels, with 118 located earthquakes in June (largest = M2.4). Deformation measurements indicate no significant uplift or subsidence of the caldera or north caldera rim since January 2026.  A small hydrothermal explosion occurred in Biscuit Basin on June 13.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EA small hydrothermal explosion occurred in Biscuit Basin at about 5:09 a.m. MDT on June 13.  The event took place 30\u201360 meters (100\u2013200 feet) north of Black Diamond Pool and was well recorded by seismic and acoustic monitoring in the basin, and it threw rocks a few meters (tens of feet) into the air and discharged large amounts of sediment-rich hot water into the Firehole River, causing a temporary discoloration for many kilometers (miles) downstream.  The explosion opened several vent areas, some of which were full of near-boiling water when observed the following day, including a crack that was about 18 meters (60 feet) long.  A day or two after the explosion, a pool of boiling water formed by collapse.  That pool was observed to erupt like a geyser on June 18 and again on June 23.  Black Diamond Pool and other thermal features in Biscuit Basin were not impacted by the new hydrothermal activity, and Black Diamond Pool had at least two very small eruptions (about 1 meter, or 3 feet, in height) in late June.  Biscuit Basin has been closed to visitors since the July 23, 2024, hydrothermal explosion from Black Diamond Pool that destroyed a stretch of boardwalk in the basin.\u003C\/p\u003E\u003Cp\u003EEchinus Geyser, in Norris Geyser Basin, remained active, with one eruption in June.  In July, Yellowstone Volcano Observatory scientists plan to begin installation of a new monitoring station that will include seismic and infrasound sensors in Upper Geyser Basin.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring June 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 118 earthquakes in the Yellowstone National Park region. The largest event of the month was a microearthquake of magnitude 2.4 located about 12 miles south-southeast of Lake in Yellowstone National Park on June 7 at 5:52 a.m. MDT.\u003C\/p\u003E\u003Cp\u003EJune seismicity in Yellowstone was marked by three swarms:\u003C\/p\u003E\u003Cp\u003E1. A swarm of 25 earthquakes occurred about 12 miles south-southeast of Lake in Yellowstone National Park during June 6\u20139. The magnitudes ranged from M0.3 to M2.4. The largest earthquake in the sequence was also the largest in June (described above).\u003C\/p\u003E\u003Cp\u003E2. A swarm of 20 earthquakes took place approximately 12 miles north-northeast of West Yellowstone, Montana, during June 22\u201325. The range of magnitudes was M0.2\u20132.1.\u003C\/p\u003E\u003Cp\u003E3. A swarm of 16 small earthquakes occurred about 10 miles north-northeast of Old Faithful in Yellowstone National Park during June 14\u201315 and had magnitudes spanning the range M0.5\u20131.6.\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 in the region since January 2026.  The uplift that started in July 2025 on the north caldera rim ceased by mid-January 2026, and there has been no uplift or subsidence of Yellowstone Caldera since December 2025.\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 118 located earthquakes in June (largest = M2.4). Deformation measurements indicate no significant uplift or subsidence of the caldera or north caldera rim since January 2026.  A small hydrothermal explosion occurred in Biscuit Basin on June 13.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ERecent Work and News\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EA small hydrothermal explosion occurred in Biscuit Basin at about 5:09 a.m. MDT on June 13.  The event took place 30\u201360 meters (100\u2013200 feet) north of Black Diamond Pool and was well recorded by seismic and acoustic monitoring in the basin, and it threw rocks a few meters (tens of feet) into the air and discharged large amounts of sediment-rich hot water into the Firehole River, causing a temporary discoloration for many kilometers (miles) downstream.  The explosion opened several vent areas, some of which were full of near-boiling water when observed the following day, including a crack that was about 18 meters (60 feet) long.  A day or two after the explosion, a pool of boiling water formed by collapse.  That pool was observed to erupt like a geyser on June 18 and again on June 23.  Black Diamond Pool and other thermal features in Biscuit Basin were not impacted by the new hydrothermal activity, and Black Diamond Pool had at least two very small eruptions (about 1 meter, or 3 feet, in height) in late June.  Biscuit Basin has been closed to visitors since the July 23, 2024, hydrothermal explosion from Black Diamond Pool that destroyed a stretch of boardwalk in the basin.\u003C\/p\u003E\u003Cp\u003EEchinus Geyser, in Norris Geyser Basin, remained active, with one eruption in June.  In July, Yellowstone Volcano Observatory scientists plan to begin installation of a new monitoring station that will include seismic and infrasound sensors in Upper Geyser Basin.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESeismicity\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDuring June 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 118 earthquakes in the Yellowstone National Park region. The largest event of the month was a microearthquake of magnitude 2.4 located about 12 miles south-southeast of Lake in Yellowstone National Park on June 7 at 5:52 a.m. MDT.\u003C\/p\u003E\u003Cp\u003EJune seismicity in Yellowstone was marked by three swarms:\u003C\/p\u003E\u003Cp\u003E1. A swarm of 25 earthquakes occurred about 12 miles south-southeast of Lake in Yellowstone National Park during June 6\u20139. The magnitudes ranged from M0.3 to M2.4. The largest earthquake in the sequence was also the largest in June (described above).\u003C\/p\u003E\u003Cp\u003E2. A swarm of 20 earthquakes took place approximately 12 miles north-northeast of West Yellowstone, Montana, during June 22\u201325. The range of magnitudes was M0.2\u20132.1.\u003C\/p\u003E\u003Cp\u003E3. A swarm of 16 small earthquakes occurred about 10 miles north-northeast of Old Faithful in Yellowstone National Park during June 14\u201315 and had magnitudes spanning the range M0.5\u20131.6.\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 in the region since January 2026.  The uplift that started in July 2025 on the north caldera rim ceased by mid-January 2026, and there has been no uplift or subsidence of Yellowstone Caldera since December 2025.\u003C\/p\u003E\u003Cp\u003EAn example of GPS data can be found at http:\/\/www.unavco.org\/instrumentation\/networks\/status\/pbo\/data\/NRWY (click on Static Plots \/ Cleaned)\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E","synopsis":"YVO Yellowstone GREEN\/NORMAL - YVO Monthly Update: background seismicity and deformation","alertLevel":"NORMAL","colorCode":"GREEN","vName":"Yellowstone","vnum":"325010","lat":44.43,"lng":-110.67,"vUrl":"https:\/\/www.usgs.gov\/volcanoes\/yellowstone","vImage":"https:\/\/volcanoes.usgs.gov\/vsc\/images\/yellowstone\/Yellowstone-home-img.jpg","region":"Wyoming","sectionId":"DOI-USGS-YVO-2026-07-01T17:25:56+00:00"}]}]