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Updated:  03/04/2025 06:15 
 


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Volcano Alerts and Activity Reports

Provided by usgs.gov Recent Volcano Observatory Activity Reports
Recent Volcano Observatory Activity Reports

Recent Volcano Updates from the U.S. Geological Survey Volcano Hazards Program

April 3rd, 2025 01:30:59 EDT -0400 HVO Kilauea ORANGE/WATCH - Episode 16 of the ongoing Halemaʻumaʻu eruption ended at 12:03 p.m. HST on April 2 when fountaining at the south vent stopped.
Apr 2, 2025 22:23 - Activity Summary: Episode 16 of the ongoing Halemaʻumaʻu eruption ended at 12:03 p.m. HST on April 2 when high fountaining at the south vent stopped. Fountains from the south vent sustained heights of 600-700 feet (180-210 meters) for over 23 hours, then dropped to less than 300 feet (90 meters) at 9:50 a.m. HST this morning, April 2. Overall, episode 16 lasted just over 37 hours with the last 25 hours and 39 minutes consisting of fountains from the south vent. During episode 16, lava flows covered over 50% of the floor of Halemaʻumaʻu within the southern part of ...
April 3rd, 2025 01:30:59 EDT -0400 AVO Great Sitkin ORANGE/WATCH - Slow eruption of lava within the summit crater continues, accompanied by occasional small earthquakes.
Apr 2, 2025 18:25 - Lava continues to erupt slowly in the summit crater of Great Sitkin Volcano, and small earthquakes continue at a low rate. No unusual activity was observed in satellite data over the past day, although cloudy conditions obscured most satellite and web camera imagery of the summit region.The current eruption of Great Sitkin Volcano began with a single explosive event in May 2021. The ongoing eruption of lava at the summit began shortly afterward, in July 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data and web cameras, and regional ...
April 3rd, 2025 01:30:59 EDT -0400 AVO Spurr YELLOW/ADVISORY - Unrest persists at Mount Spurr. Seismicity remains elevated.
Apr 2, 2025 18:25 - Unrest continues at Mount Spurr volcano. Seismicity remains elevated with numerous small, shallow volcanic earthquakes detected beneath the volcano over the past day. No activity detected in satellite data or web-camera data.AVO continues monitoring activity at Mount Spurr for signals indicating that the volcano is moving closer to an eruption. Based on previous eruptions, changes from current activity in the earthquakes, ground deformation, summit lake conditions, and fumarolic activity would be expected if magma began to move closer to the surface. Therefore, if an ...
April 3rd, 2025 01:30:59 EDT -0400 YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation
Apr 1, 2025 18:46 - SummaryYellowstone Caldera activity remains at background levels, with 70 located earthquakes in March (largest = M2.2). Deformation measurements indicate a small amount of caldera subsidence since early October. Recent Work and NewsAlthough a major eruption of Steamboat Geyser did not occur in March, frequent minor activity started in early March and lasted throughout the month. This pattern of activity suggests that a major eruption will occur in the coming weeks. SeismicityDuring March 2025, the University of Utah Seismograph Stations, responsible for the operation and ...
April 3rd, 2025 01:30:59 EDT -0400 CALVO GREEN/NORMAL - CA volcanoes were at normal background levels of seismicity and deformation during the past week.
Apr 1, 2025 17:18 - 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 March 24 (0000h PDT) to March 30 (2359h PDT):Typical seismicity was recorded at The Geysers geothermal field south of the Clear Lake ...
April 3rd, 2025 01:30:59 EDT -0400 AVO Katmai GREEN/NORMAL - Resuspended ash detected from Katmai region.
Mar 31, 2025 20:25 - 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 carried 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 4,000 ft 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 ...
April 3rd, 2025 01:30:59 EDT -0400 CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
Mar 28, 2025 20:33 - 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.
April 3rd, 2025 01:30:59 EDT -0400 NMI Ahyi Seamount YELLOW/ADVISORY - Unrest likely continues.
Mar 27, 2025 19:27 - Unrest at Ahyi Seamount likely continues. The last observations of discolored water over the vent area were on March 15, 2025. Similar plumes on the ocean's surface above Ahyi Seamount have been observed in satellite imagery sporadically since August 5, 2024. No regional geophysical signals were detected.There are no local monitoring stations near Ahyi seamount, which limits our ability to detect and characterize volcanic unrest there. We will continue to monitor satellite and distant hydroacoustic data closely for additional evidence for, or escalation of, volcanic ...
April 3rd, 2025 01:30:59 EDT -0400 HVO Ofu-Olosega GREEN/NORMAL - No activity of concern for Ofu-Olosega.
Mar 6, 2025 20:15 - 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.
April 3rd, 2025 01:30:59 EDT -0400 HVO Ta'u Island GREEN/NORMAL - No activity of concern for Taʻū Island
Mar 6, 2025 20:15 - 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. Global Positioning System (GPS) instrument on Taʻū Island recorded no significant vertical deformation.
April 3rd, 2025 01:30:59 EDT -0400 HVO Tutuila Island GREEN/NORMAL - No activity of concern for Tutuila Island
Mar 6, 2025 20:15 - 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.
April 3rd, 2025 01:30:59 EDT -0400 HVO Mauna Loa GREEN/NORMAL - No significant changes at Mauna Loa in the past month; slow inflation of the summit continues.
Mar 6, 2025 20:10 - Seismicity beneath Mauna Loa's summit and upper-elevation flanks has been low over the past month; approximately 66 small-magnitude earthquakes (most below M1.5) were detected, which is expected for the post-eruption phase of this volcano and similar to the previous month.Data from Global Positioning System (GPS) instruments on Mauna Loa continued to show only minor inflation near the summit as the volcano recovers from the 2022 eruption and magma replenishes the reservoir system. Gas and temperature data from a station on Mauna Loa's Southwest Rift Zone show that average ...
April 3rd, 2025 01:30:59 EDT -0400 HVO Kama'ehuakanaloa UNASSIGNED/UNASSIGNED - No activity of concern for Kamaʻehuakanaloa.
Mar 6, 2025 20:10 - Seismicity has been low at Kamaʻehuakanaloa volcano (formerly Lōʻihi Seamount) over the past several months. There have been about 9 earthquakes in the past month, which is representative of background activity at the volcano; all earthquakes were of small magnitudes (below M3.0).
April 3rd, 2025 01:30:59 EDT -0400 HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
Mar 6, 2025 20:10 - 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; earthquakes were all below magnitude-3. The continuously recording Global Positioning System (GPS) instrument on Hualālai recorded no significant deformation in the past month.
April 3rd, 2025 01:30:59 EDT -0400 HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā.
Mar 6, 2025 20:10 - No significant activity was detected at Haleakalā 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 Haleakalā shows no significant changes.

 

Volcano Alert Levels
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.
UNASSIGNED

 

Aviation Alert Color Codes ICAO
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].