Recent Volcano Updates from the U.S. Geological Survey Volcano Hazards Program https://volcanoes.usgs.gov U.S. Geological Survey Volcano Hazards Program Wed, 06 May 2026 04:15:37 +0000 Activity Summary: Episode 46 of the ongoing Halemaʻumaʻu eruption ended abruptly at 5:22 p.m. HST on May 5, 2026, after 9 hours of continuous lava fountaining, primarily from the north vent. The eruption is currently paused. Tephra fell outside of the closed area of Hawaiʻi Volcanoes National Park along the north rim of Kaluapele (Kīlauea caldera), on Highway 11 between mile markers 30 and 34, and in adjacent communities. Tephra as large as 6 inches (15 centimeters) was observed falling on Highway 11 in the national park, and fine ash and Peleʻs hair were reported as far away as Mountain ... https://www.usgs.gov/volcanoes/kilauea https://www.usgs.gov/volcanoes/kilauea hvo 19.421 -155.287 ADVISORY YELLOW Power has been sufficiently restored to the Port Heiden Receive Facility, allowing stable data flow from Aniakchak seismic stations. There are now enough reliable data to establish the real-time state of the volcano. Due to this, Aniakchak Volcano is moving from UNASSIGNED to GREEN/NORMAL.Aniakchak Volcano had been at UNASSIGNED since December 23, 2025 due to a lack of data received from Aniakchak seismic stations following a power outage at the Port Heiden Receive Facility. Repairs have since been made to the Port Heiden Receive Facility, sufficiently restoring data flow from the Aniakchak ... https://avo.alaska.edu/activity/Aniakchak.php https://avo.alaska.edu/activity/Aniakchak.php avo 56.9058 -158.209 NORMAL GREEN Slow lava effusion continues within the Great Sitkin summit crater. Over the past day, seismic data recorded rockfalls from the growing lava dome. Slightly elevated surface temperatures observed in satellite images over the past day. No significant activity was observed in web camera views. The current lava eruption began in July 2021 and, since then, has filled most of the summit crater and advanced into valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data, webcams, ... https://www.avo.alaska.edu/activity/GreatSitkin.php https://www.avo.alaska.edu/activity/GreatSitkin.php avo 52.0765 -176.1109 WATCH ORANGE Unrest persists at Shishaldin Volcano, with seismic and infrasound activity remaining elevated over the past day. Partly cloudy webcam images showed a consistent steam plume emanating from the summit. Weak sulfur dioxide emissions and barely elevated surface temperatures were also observed in satellite data.Local seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions. https://avo.alaska.edu/activity/Shishaldin.php https://avo.alaska.edu/activity/Shishaldin.php avo 54.7554 -163.9711 ADVISORY YELLOW SummaryYellowstone Caldera activity remains at background levels, with 97 located earthquakes in April (largest = M2.5). Deformation measurements indicate no significant uplift or subsidence of the caldera or north caldera rim since January 2026. Recent Work and NewsEchinus Geyser, in Norris Geyser Basin, reawakened from a several-year slumber in February, with about 40 eruptions that month, but the geyser had only four eruptions in April. At Black Diamond Pool in Biscuit Basin (site of a hydrothermal explosion in 2024), two eruptions were recorded during the month by acoustic, seismic, and ... https://www.usgs.gov/volcanoes/yellowstone https://www.usgs.gov/volcanoes/yellowstone yvo 44.43 -110.67 NORMAL GREEN Activity Update: 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.Past Week Observations: Small earthquakes were detected at Mount Rainier, Mount St. Helens, and Mount Hood during the past week. All monitoring data are consistent with background activity levels in the Cascade Range. Field engineers took advantage of excellent spring weather and ... https://volcanoes.usgs.gov/observatories/cvo https://volcanoes.usgs.gov/observatories/cvo cvo 45.61 -122.5 NORMAL GREEN High-resolution satellite imagery revealed a point source plume of discolored water near Ahyi Seamount on April 10 and a diffuse plume on April 13. No signs of volcanic activity or unrest were detected in data from remote underwater pressure sensors, nor were there any other indicators suggesting significant unrest. The last time a similar plume was visible in satellite imagery was on April 8, 2026; however, persistent cloud cover and limited availability of high-quality satellite images have made it challenging to monitor such occurrences consistently.There are no local monitoring stations ... https://www.usgs.gov/volcanoes/ahyi-seamount https://www.usgs.gov/volcanoes/ahyi-seamount nmi 20.437 145.03 UNASSIGNED UNASSIGNED Seismic activity, sulfur dioxide emissions, and thermal anomalies at Korovin Volcano (located within the Atka Volcanic Complex) have declined over the past couple weeks and are now at background levels. The Aviation Color Code and the Alert Level for the Atka Volcanic Complex are being lowered to GREEN/NORMAL. Small explosive events can occur at Korovin Volcano without significant precursory unrest. Fallout of ash from such events is unlikely to extend beyond the upper flanks of the volcano. https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Atka https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Atka avo 52.3309 -174.139 NORMAL GREEN No significant activity was detected at Ofu-Olosega volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano. https://www.usgs.gov/volcanoes/ofu-olosega https://www.usgs.gov/volcanoes/ofu-olosega hvo -14.175 -169.618 NORMAL GREEN No significant activity was detected at Taʻū volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano. Local residents reported a landslide occurring on March 26, 2026 SST, between Ta‘ū and Fiti‘uta, but the event is not readily visible on the local monitoring station data. A Global Positioning System (GPS) instrument on Taʻū Island recorded no significant deformation.The FAGA broadband seismometer located on eastern Taʻū Island is currently out of service. The TAU broadband ... https://www.usgs.gov/volcanoes/ta-u-island https://www.usgs.gov/volcanoes/ta-u-island hvo -14.23 -169.454 NORMAL GREEN No significant activity was detected at Tutuila volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano. https://www.usgs.gov/volcanoes/tutuila-island https://www.usgs.gov/volcanoes/tutuila-island hvo -14.295 -170.7 NORMAL GREEN No significant activity was detected at Haleakalā volcano during the past month. HVO seismometers recorded one earthquake, under the onshore tip of the Southwest Rift Zone. The continuously recording Global Positioning System (GPS) instrument on Haleakalā recorded no significant deformation in the past month. https://www.usgs.gov/volcanoes/haleakal%C4%81 https://www.usgs.gov/volcanoes/haleakal%C4%81 hvo 20.708 -156.25 NORMAL GREEN No significant activity was detected at Hualālai volcano during the past month. Seismic activity remained low, and was representative of background activity levels at the volcano. The continuously recording Global Positioning System (GPS) instrument on Hualālai recorded no significant deformation through the first half of March, and went offline on March 15. HVO field engineers will service the station to get it back online. https://www.usgs.gov/volcanoes/hual%C4%81lai https://www.usgs.gov/volcanoes/hual%C4%81lai hvo 19.692 -155.87 NORMAL GREEN No significant activity was detected at Kamaʻehuakanaloa (formerly Lōʻihi Seamount) during the past month. Seismic activity remained low, and was representative of background activity levels at the volcano; all earthquakes were of small magnitudes. https://www.usgs.gov/volcanoes/kama%E2%80%98ehuakanaloa https://www.usgs.gov/volcanoes/kama%E2%80%98ehuakanaloa hvo 18.92 -155.27 UNASSIGNED UNASSIGNED Mauna Kea seismic activity was elevated compared to the previous month with a swarm of earthquakes clustered about 12 miles (20 km) north-northeast of Mauna Kea summit—although the earthquakes are attributed to the underlying and inactive Kohala volcano. More details are available in the Information Statement issued on this swarm, available here: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-HVO-2026-03-27T20:03:46+00:00. Continuous GPS instruments on Mauna Kea volcano did not record significant changes in ground deformation trends through March 2026. https://www.usgs.gov/volcanoes/mauna-kea https://www.usgs.gov/volcanoes/mauna-kea hvo 19.82 -155.47 NORMAL GREEN Mauna Loa had decrease in seismic activity compared to the previous month, with clustering of events under Mokuʻāweoweo and the upper Southwest Rift Zone still present. A total of 86 earthquakes were detected beneath Mauna Loa's summit region in the February reporting period, while the prior month had 116 earthquakes. Data from Global Positioning System (GPS) instruments on Mauna Loa show variable rates of inflation at the summit over the past six months. This is associated with refilling of the summit reservoir system following the 2022 eruption.Gas and temperature data from a station on ... https://www.usgs.gov/volcanoes/mauna-loa https://www.usgs.gov/volcanoes/mauna-loa hvo 19.475 -155.608 NORMAL GREEN Strong 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.This 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 ... https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Katmai https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Katmai avo 58.279 -154.9533 NORMAL GREEN Restoration of power in the City of Cold Bay has enabled the Alaska Volcano Observatory (AVO) to reestablish real-time data from seismic monitoring instruments near Fisher volcano. With renewed seismic monitoring, the volcano moves from UNASSIGNED to Volcano Alert Level NORMAL and Aviation Color Code GREEN. As at other Alaska volcanoes, AVO will continue to monitor seismic, satellite, infrasound, and lightning data, and reports from pilots and ground observers to detect signs of eruptive activity. https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Fisher https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Fisher avo 54.6692 -164.3524 NORMAL GREEN Restoration of power in the City of Cold Bay has enabled the Alaska Volcano Observatory (AVO) to reestablish real-time data from seismic monitoring instruments at Westdahl volcano. With renewed seismic monitoring, the volcano moves from UNASSIGNED to Volcano Alert Level NORMAL and Aviation Color Code GREEN. As at other Alaska volcanoes, AVO will continue to monitor seismic, satellite, infrasound, and lightning data, and reports from pilots and ground observers to detect signs of eruptive activity. https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Westdahl https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Westdahl avo 54.5171 -164.6476 NORMAL GREEN