Recent Volcano Updates from the U.S. Geological Survey Volcano Hazards Program https://volcanoes.usgs.gov U.S. Geological Survey Volcano Hazards Program Mon, 03 Aug 2026 20:05:12 +0000 Slow eruption of lava within the summit crater continues with associated low level seismicity. Satellite and web camera observations were obscured by clouds.The current eruption began in July 2021 and, since then, lava flows have filled most of the summit crater and advanced into valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data, webcams, and regional infrasound and lightning networks. https://www.avo.alaska.edu/activity/GreatSitkin.php https://www.avo.alaska.edu/activity/GreatSitkin.php avo 52.0765 -176.1109 WATCH ORANGE Earthquake activity was low over the past day. Satellite and web camera observations of the volcano were obscured by clouds. A new temporary monitoring station was installed recently near Mount Kupreanof and is providing seismic data, infrasound data, gas measurements, and web camera images on an intermittent basis. This is by design to conserve battery power, but the frequency of data acquisition can be increased if activity warrants. The closest functioning seismometers that provide continuous data are approximately 10 miles (16 km) to the northeast of the volcano as part of the Mount ... https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Kupreanof https://avo.alaska.edu/volcanoes/volcinfo.php?volcname=Kupreanof avo 56.0126 -159.7912 ADVISORY YELLOW Minor seismic activity and infrasound were detected at the volcano during the past day. Sulfur dioxide emissions were observed in satellite data from yesterday afternoon. Satellite and web camera observations of the volcano were obscured by clouds.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 Overview:The summit eruption of Kīlauea in Halemaʻumaʻu is paused. Glow from the north vent continues. Summit tilt continues on a weak deflationary trend from yesterday to this morning. Models indicate that the forecast window for episode 53 is between August 7 and August 14.No significant activity has been noted along Kīlauea’s East Rift Zone or Southwest Rift Zone.A summary of episode 52 is posted below.NOTE: Significant changes in activity between Daily Updates are posted here: https://www.usgs.gov/observatories/hvo/observatory-messages Summit Observations:Intermittent, moderate glow ... https://www.usgs.gov/volcanoes/kilauea https://www.usgs.gov/volcanoes/kilauea hvo 19.421 -155.287 ADVISORY YELLOW Yellowstone Caldera activity remains at background levels, with 68 located earthquakes in July (largest = M3.3). Deformation measurements indicate no significant uplift of the north caldera rim since January 2026 and only minor uplift of the caldera since the beginning of the year. Recent Work and NewsIn response to the small hydrothermal explosion at Biscuit Basin on June 13, a new camera was installed in the area on July 22 with a view of both Black Diamond Pool (site of a hydrothermal explosion in 2024) and the June 13 explosion area. Camera images are updated every 15 minutes at ... 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: During the past week, small earthquakes were detected at Mount Rainier, Mount St. Helens, and Mount Hood. All monitoring data are consistent with background activity levels in the Cascade Range. Field crews conducted station maintenance at Crater Lake. https://volcanoes.usgs.gov/observatories/cvo https://volcanoes.usgs.gov/observatories/cvo cvo 45.61 -122.5 NORMAL GREEN There were several clear satellite images of the ocean over Ahyi Seamount this past week, but there were no observations of underwater plumes. Distal geophysical monitoring showed no evidence of activity. Eruptive activity at Ahyi Seamount may present a hazard to mariners in the water above and near the volcano. The 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 ... https://www.usgs.gov/volcanoes/ahyi-seamount https://www.usgs.gov/volcanoes/ahyi-seamount nmi 20.437 145.03 ADVISORY YELLOW 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 A small explosion from Korovin Volcano within the Atka Volcanic complex was detected in seismic and infrasound data on July 16, 2026. Since then, unrest has declined. As a result, the Aviation Color Code and Alert Level are being lowered to GREEN/NORMAL. 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. 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 seismometer on western Taʻū Island remains operational. 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 no earthquakes in the vicinity of the volcano. 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 has been offline since March 15, 2026; HVO field engineers will service the station within the next few months to bring 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 volcano (formerly Lōʻihi Seamount) during the past month. Seismic activity remained low and was representative of background activity levels at the volcano. 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 No significant activity was detected at Mauna Kea 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 Mauna Kea, operated by NASA's Jet Propulsion Laboratory, recorded no significant deformation in the past month. https://www.usgs.gov/volcanoes/mauna-kea https://www.usgs.gov/volcanoes/mauna-kea hvo 19.82 -155.47 NORMAL GREEN Mauna Loa had a decrease in seismic activity compared to the previous month; a total of 94 earthquakes were detected in Mauna Loa's summit region during the June reporting period, after 170 in May. Earthquakes were broadly scattered beneath Mokuʻāweoweo, the upper Southwest Rift Zone, and the upper northwest flank.Data from Global Positioning System (GPS) instruments on Mauna Loa showed slight contraction across the summit region in the past month. Similar pauses have been previously detected during the overall inflationary period that has persisted since the 2022 eruption, with magma ... https://www.usgs.gov/volcanoes/mauna-loa https://www.usgs.gov/volcanoes/mauna-loa hvo 19.475 -155.608 NORMAL GREEN