Recent Volcano Updates from the U.S. Geological Survey Volcano Hazards Program https://volcanoes.usgs.gov U.S. Geological Survey Volcano Hazards Program Fri, 14 Aug 2026 21:05:44 +0000 Aug 14, 2026 21:05 - Lava continues to erupt slowly within the summit crater. Satellite data show that the lava dome is gradually expanding toward the east and slightly elevated surface temperatures were observed when cloud cover did not obscure the volcano. Seismic activity remains low, with only occasional small volcanic earthquakes and seismic signals associated with minor rockfalls.The current lava eruption began in July 2021 and has filled most of the summit crater and advanced into the valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The ... https://www.usgs.gov/programs/VHP/volcano-updates#avo DOI-USGS-AVO-2026-08-14T18:40:26+00:00 52.0765 -176.1109 WATCH ORANGE Aug 14, 2026 21:05 - Low-level unrest continues at Mount Kupreanof. Local earthquakes have been occurring at a low rate. Robust steam emissions from the fumarole field on the southwest flank of Kupreanof were observed in web camera images, and emissions of sulfur dioxide gas were observed in satellite data this past week. 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 ... https://www.usgs.gov/programs/VHP/volcano-updates#avo DOI-USGS-AVO-2026-08-14T18:40:27+00:00 56.0126 -159.7912 ADVISORY YELLOW Aug 14, 2026 21:05 - Volcanic activity remains elevated with numerous small earthquakes, persistent tremor, and frequent infrasound signals generated by small explosions within the volcanic conduit. During periods of clear weather, a robust a steam plume was observed in web camera and satellite images and by numerous passing aircraft. Sulfur dioxide gas emissions continue to be observed in satellite data.Shishaldin Volcano is monitored by local seismic and infrasound sensors, web cameras, and a telemetered geodetic network. In addition to the local monitoring network, the Alaska Volcano ... https://www.usgs.gov/programs/VHP/volcano-updates#avo DOI-USGS-AVO-2026-08-14T18:40:28+00:00 54.7554 -163.9711 ADVISORY YELLOW Aug 14, 2026 21:05 - A large rock and ice avalanche on the eastern flank of Iliamna Volcano was detected by seismic and infrasound sensors at 07:57 AKDT (15:57 UTC) on Saturday, August 8. The source area of the avalanche was also visible in web camera data. Large avalanches are common at this volcano, and the event does not indicate volcanic unrest. Avalanches of similar size have been previously observed in 2016, 2019 and 2023. https://www.usgs.gov/programs/VHP/volcano-updates#avo DOI-USGS-AVO-2026-08-14T19:12:57+00:00 60.0319 -153.0918 NORMAL GREEN Aug 14, 2026 19:55 - Overview:The summit eruption of Kīlauea in Halemaʻumaʻu is paused following 9.6 hours of lava fountaining during episode 53 on August 12-13, 2026. Data from summit tiltmeters showed re-inflation began immediately following the end of episode 53, suggesting that another episode is likely; however, mild deflationary tilt has been recorded since just after midnight last night. More data are needed to determine the forecast. No significant activity has been noted along Kīlauea’s East Rift Zone or Southwest Rift Zone.A summary of episode 53 is posted below.NOTE: ... https://www.usgs.gov/programs/VHP/volcano-updates#hvo DOI-USGS-HVO-2026-08-14T18:55:24+00:00 19.421 -155.287 ADVISORY YELLOW Aug 14, 2026 18:06 - 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, Mount Hood, and Newberry. All monitoring data are consistent with background activity levels in the Cascade Range. Field crews conducted station ... https://www.usgs.gov/programs/VHP/volcano-updates#cvo DOI-USGS-CVO-2026-08-12T15:57:45+00:00 45.61 -122.5 NORMAL GREEN Aug 14, 2026 00:02 - No activity was observed in occasional clear satellite images or distal geophysical monitoring data over the past week.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 evidence for, or escalation of, volcanic activity. https://www.usgs.gov/programs/VHP/volcano-updates#nmi DOI-USGS-NMI-2026-08-13T23:51:15+00:00 20.437 145.03 ADVISORY YELLOW Aug 12, 2026 04:42 - HAWAIIAN VOLCANO OBSERVATORY INFORMATION STATEMENTOn Tuesday, August 11, 5:48 p.m. HST, a magnitude-5.2 earthquake occurred beneath Kamaʻehuakanaloa volcano 26 mi (42 km) east-southeast offshore of Nāʻālehu on the Island of Hawaiʻi at a depth of 7 mi (11 km) below sea level. The magnitude-5.2 earthquake is part of an ongoing sequence of earthquakes associated with unrest of Kamaʻehuakanaloa (formerly Lōʻihi) Seamount that started on Sunday, August 9. These earthquakes have no apparent impact on either Mauna Loa or Kīlauea volcanoes. The USGS Hawaiian Volcano ... https://www.usgs.gov/programs/VHP/volcano-updates#hvo DOI-USGS-HVO-2026-08-12T04:22:01+00:00 18.92 -155.27 UNASSIGNED UNASSIGNED Aug 11, 2026 16:39 - Monitored CALIFORNIA VOLCANOESCurrent Volcano Alert Level: all NORMALCurrent Aviation Color Code: all GREENActivity Update: All 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.Past Week Observations for August 03 (0000h PDT) to August 09 (2359h PDT):One earthquake greater than M1 was recorded within the Clear Lake Volcanic Field, with ... https://www.usgs.gov/programs/VHP/volcano-updates#calvo DOI-USGS-CALVO-2026-08-11T15:43:04+00:00 37.4553648752025 -122.17073209917 NORMAL GREEN Aug 7, 2026 01:12 - 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/programs/VHP/volcano-updates#hvo DOI-USGS-HVO-2026-08-07T00:21:40+00:00 -14.175 -169.618 NORMAL GREEN Aug 7, 2026 01:12 - 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/programs/VHP/volcano-updates#hvo DOI-USGS-HVO-2026-08-07T00:21:41+00:00 -14.23 -169.454 NORMAL GREEN Aug 7, 2026 01:12 - 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/programs/VHP/volcano-updates#hvo DOI-USGS-HVO-2026-08-07T00:21:42+00:00 -14.295 -170.7 NORMAL GREEN Aug 7, 2026 01:06 - Mauna Loa had a decrease in seismic activity compared to the previous month; a total of 57 earthquakes were detected in Mauna Loa's summit region during the July reporting period, after 94 in June. Most earthquakes occurred deep beneath the upper Southwest Rift Zone or broadly scattered around the upper flanks. Very few earthquakes occurred directly beneath Mokuʻāweoweo.Data from Global Positioning System (GPS) instruments on Mauna Loa showed slight inflation across the summit region in the past month. Most GPS stations at the summit recorded small upward vertical ... https://www.usgs.gov/programs/VHP/volcano-updates#hvo DOI-USGS-HVO-2026-08-06T23:05:29+00:00 19.475 -155.608 NORMAL GREEN Aug 7, 2026 01:06 - 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/programs/VHP/volcano-updates#hvo DOI-USGS-HVO-2026-08-06T23:05:30+00:00 19.692 -155.87 NORMAL GREEN Aug 7, 2026 01:06 - No significant activity was detected at Haleakalā volcano during the past month. HVO seismometers recorded one earthquake in the vicinity of the volcano. The continuously recording Global Positioning System (GPS) instrument on Haleakalā lost connection on July 13th. No significant deformation was recorded leading up to the outage. The station is owned and operated by researchers at the Pacific GPS Facility (PGF), as part of the Hawaii Institute of Geophysics and Planetology (HIGP), who will service the station within the next few months to bring it back online. https://www.usgs.gov/programs/VHP/volcano-updates#hvo DOI-USGS-HVO-2026-08-06T23:05:31+00:00 20.708 -156.25 NORMAL GREEN Aug 7, 2026 01:06 - 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/programs/VHP/volcano-updates#hvo DOI-USGS-HVO-2026-08-06T23:05:32+00:00 19.82 -155.47 NORMAL GREEN Aug 1, 2026 15:05 - 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 ... https://www.usgs.gov/programs/VHP/volcano-updates#yvo DOI-USGS-YVO-2026-08-01T14:58:28+00:00 44.43 -110.67 NORMAL GREEN Jul 25, 2026 00:19 - 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 ... https://www.usgs.gov/programs/VHP/volcano-updates#avo DOI-USGS-AVO-2026-03-06T00:26:58+00:00 58.279 -154.9533 NORMAL GREEN Jul 21, 2026 20:08 - 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://www.usgs.gov/programs/VHP/volcano-updates#avo DOI-USGS-AVO-2026-07-21T18:52:50+00:00 52.3309 -174.139 NORMAL GREEN