{"@attributes":{"version":"2.0"},"channel":{"title":"Recent Volcano Observatory Activity Reports","description":"Recent Volcano Updates from the U.S. Geological Survey Volcano Hazards Program","link":"https:\/\/volcanoes.usgs.gov","pubDate":"Mon, 20 Apr 2026 19:59:33 +0000","item":[{"title":"AVO Great Sitkin ORANGE\/WATCH - Slow eruption of lava within the summit crater continues.","description":"Apr 20, 2026 19:59 - Slow lava effusion continues within the Great Sitkin summit crater. Over the past day, seismic data recorded rockfalls from the growing lava dome. Web camera and satellite views were cloudy.  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, and regional infrasound and lightning networks.","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#avo","guid":"DOI-USGS-AVO-2026-04-20T19:42:29+00:00"},{"title":"AVO Shishaldin YELLOW\/ADVISORY - Low-level unrest continues with seismic tremor and sulphur dioxide emissions.","description":"Apr 20, 2026 19:59 - Unrest persists at Shishaldin Volcano, with seismic activity remaining elevated over the past day. Satellite and web camera views were mostly cloudy, though sulphur dioxide emissions were detected in one satellite image.  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. ","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#avo","guid":"DOI-USGS-AVO-2026-04-20T19:42:30+00:00"},{"title":"HVO Kilauea YELLOW\/ADVISORY - K\u012blauea summit eruption in Halema\u02bbuma\u02bbu is paused. Forecasting suggests lava fountaining episode 45 will occur between Tuesday 4\/21 and Sunday 4\/26.","description":"Apr 20, 2026 17:53 - Overview:The summit eruption of K\u012blauea in Halema\u02bbuma\u02bbu is paused. Overall summit region inflation has continued since the end of episode 44 on April 9, with continued inflation over the past 24 hours. Strong and continuous glow, with frequent flames, have continued to be visible at the south vent overnight, as well as intermittent glow at the north vent. Forecast models currently suggest that lava fountaining episode 45 will occur sometime between Tuesday, April 21, and Sunday, April 26. No significant activity has been noted along K\u012blauea\u2019s East Rift Zone or  ...","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#hvo","guid":"DOI-USGS-HVO-2026-04-20T17:47:03+00:00"},{"title":"CVO Cascade Range GREEN\/NORMAL - All volcanoes are at normal levels.","description":"Apr 17, 2026 21:34 - 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: A few small earthquakes were detected during the past week at Mount St. Helens and Mount Rainier. All monitoring data are consistent with background activity levels in the Cascade Range.","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#cvo","guid":"DOI-USGS-CVO-2026-04-17T21:15:19+00:00"},{"title":"NMI Ahyi Seamount UNASSIGNED\/UNASSIGNED - Plume of discolored water observed in satellite image this week.","description":"Apr 16, 2026 22:02 - 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  ...","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#nmi","guid":"DOI-USGS-NMI-2026-04-16T21:46:23+00:00"},{"title":"CALVO GREEN\/NORMAL - CA volcanoes were at normal background levels of seismicity and deformation during the past week.","description":"Apr 14, 2026 17:39 - 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 April 06 (0000h PDT) to April 12 (2359h PDT):Typical seismicity was recorded at The Geysers geothermal field south of the Clear Lake  ...","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#calvo","guid":"DOI-USGS-CALVO-2026-04-14T15:09:22+00:00"},{"title":"AVO Atka volcanic complex GREEN\/NORMAL - Decreased seismicity and gas detections.","description":"Apr 13, 2026 23:47 - 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.   ","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#avo","guid":"DOI-USGS-AVO-2026-04-13T20:27:02+00:00"},{"title":"HVO Ofu-Olosega GREEN\/NORMAL - No activity of concern for Ofu-Olosega.","description":"Apr 2, 2026 18:49 - 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. ","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#hvo","guid":"DOI-USGS-HVO-2026-04-02T18:43:11+00:00"},{"title":"HVO Ta'u Island GREEN\/NORMAL - No activity of concern for Ta\u02bb\u016b Island","description":"Apr 2, 2026 18:49 - No significant activity was detected at Ta\u02bb\u016b 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\u2018\u016b and Fiti\u2018uta, but the event is not readily visible on the local monitoring station data. A Global Positioning System (GPS) instrument on Ta\u02bb\u016b Island recorded no significant deformation.The FAGA broadband seismometer located on eastern Ta\u02bb\u016b Island is currently out of service.  ...","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#hvo","guid":"DOI-USGS-HVO-2026-04-02T18:43:12+00:00"},{"title":"HVO Tutuila Island GREEN\/NORMAL - No activity of concern for Tutuila Island","description":"Apr 2, 2026 18:49 - 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.","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#hvo","guid":"DOI-USGS-HVO-2026-04-02T18:43:13+00:00"},{"title":"HVO Mauna Loa GREEN\/NORMAL - Mauna Loa earthquake counts slightly decreased in March, and inflationary ground deformation continued.","description":"Apr 2, 2026 18:36 - Mauna Loa had decrease in seismic activity compared to the previous month, with clustering of events under Moku\u02bb\u0101weoweo 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  ...","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#hvo","guid":"DOI-USGS-HVO-2026-04-02T18:22:21+00:00"},{"title":"HVO Kama'ehuakanaloa UNASSIGNED\/UNASSIGNED - No activity of concern for Kama\u02bbehuakanaloa.","description":"Apr 2, 2026 18:36 - No significant activity was detected at Kama\u02bbehuakanaloa (formerly L\u014d\u02bbihi 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.","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#hvo","guid":"DOI-USGS-HVO-2026-04-02T18:22:25+00:00"},{"title":"HVO Hualalai GREEN\/NORMAL - No activity of concern for Hual\u0101lai.","description":"Apr 2, 2026 18:36 - No significant activity was detected at Hual\u0101lai 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 Hual\u0101lai 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.","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#hvo","guid":"DOI-USGS-HVO-2026-04-02T18:22:22+00:00"},{"title":"HVO Haleakala GREEN\/NORMAL - No activity of concern for Haleakal\u0101.","description":"Apr 2, 2026 18:36 - No significant activity was detected at Haleakal\u0101 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 Haleakal\u0101 recorded no significant deformation in the past month.","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#hvo","guid":"DOI-USGS-HVO-2026-04-02T18:22:23+00:00"},{"title":"HVO Mauna Kea GREEN\/NORMAL - No activity of concern for Mauna Kea.","description":"Apr 2, 2026 18:36 - 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\u2014although 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. ","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#hvo","guid":"DOI-USGS-HVO-2026-04-02T18:22:24+00:00"},{"title":"YVO Yellowstone GREEN\/NORMAL - YVO Monthly Update: background seismicity and deformation","description":"Apr 1, 2026 16:30 - SummaryYellowstone Caldera activity remains at background levels, with 61 located earthquakes in March (largest = M1.9). Deformation measurements indicate a pause in the uplift that had been occurring along the north caldera rim since July 2025. 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 one eruption in March.  An eruption was detected by acoustic, seismic, and temperature measurements at Black Diamond Pool in Biscuit Basin (site of a  ...","link":"https:\/\/www.usgs.gov\/programs\/VHP\/volcano-updates#yvo","guid":"DOI-USGS-YVO-2026-04-01T16:26:51+00:00"}]}}