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Updated:  16/04/2025 07:45 
 


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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 16th, 2025 02:48:39 EDT -0400 HVO Kilauea ORANGE/WATCH - The ongoing Halemaʻumaʻu eruption remains paused. Episode 18 is likely to start today or tomorrow.
Apr 15, 2025 19:30 - Activity Summary:  The ongoing Halemaʻumaʻu eruption is paused; episode 17 ended at 9:45 a.m. HST on April 9 when low fountaining at the south vent stopped. Last night both the north and south vents were glowing strongly as seen in webcam images. Both vents continue to degas. If the eruptive activity reverts to pre-episode 17 behavior, data indicate that episode 18 is most likely to start today or tomorrow.Kīlauea's current eruption in Halemaʻumaʻu crater within Kaluapele (the summit caldera) began on December 23, 2024. There have now been 17 episodes of ...
April 16th, 2025 02:48:39 EDT -0400 AVO Great Sitkin ORANGE/WATCH - Slow eruption of lava within the summit crater continues, accompanied by occasional small earthquakes.
Apr 15, 2025 19:08 - Lava continues to erupt slowly in the summit crater of Great Sitkin Volcano, and small earthquakes continue at a low rate. No activity was observed in satellite and web camera images over the past day. 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 infrasound and lightning networks.
April 16th, 2025 02:48:39 EDT -0400 AVO Spurr YELLOW/ADVISORY - Unrest persists at Mount Spurr. Seismicity remains elevated.
Apr 15, 2025 19:08 - Unrest continues at Mount Spurr volcano. Seismicity remains elevated with occasional small, shallow volcanic earthquakes detected beneath the volcano over the past day. Minor and typical steaming from the summit was observed in web camera images during periods of clear viewing conditions. No evidence of activity observed in satellite imagesAVO 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 ...
April 16th, 2025 02:48:39 EDT -0400 CALVO GREEN/NORMAL - CA volcanoes were at normal background levels of seismicity and deformation during the past week.
Apr 15, 2025 16:55 - 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 07 (0000h PDT) to April 13 (2359h PDT):Typical seismicity was recorded at The Geysers geothermal field south of the Clear Lake ...
April 16th, 2025 02:48:39 EDT -0400 AVO Katmai GREEN/NORMAL - Resuspended ash was detected in the Katmai area on April 6-7 and 8-9. No eruption occurred.
Apr 11, 2025 20:23 - On two occasions this week, April 6-7 and 8-9, strong northwesterly winds near Katmai and the Valley of Ten Thousand Smokes picked up loose volcanic ash from the 1912 Novarupta-Katmai eruption and carried it southeast. The National Weather Service issued SIGMETs for these low-level events and suggested that the maximum cloud height was 6,000 ft (1.8 km) and 5,000 ft (1.5 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 ...
April 16th, 2025 02:48:39 EDT -0400 CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
Apr 11, 2025 17:22 - 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 performed maintenance on lahar ...
April 16th, 2025 02:48:39 EDT -0400 NMI Ahyi Seamount YELLOW/ADVISORY - Unrest likely continues.
Apr 10, 2025 23:58 - Unrest at Ahyi Seamount likely continues. No unusual activity was observed in satellite data this week. The last observations of discolored water over the vent area were on March 30, 2025. Similar plumes on the ocean's surface above Ahyi Seamount have been observed in satellite imagery sporadically since August 5, 2024. Seismicity was quiet although regional geophysical monitoring data outages occurred on several days over the past week. There are no local monitoring stations near Ahyi seamount, which limits our ability to detect and characterize volcanic unrest there. We ...
April 16th, 2025 02:48:39 EDT -0400 HVO Ofu-Olosega GREEN/NORMAL - No activity of concern for Ofu-Olosega.
Apr 3, 2025 21:02 - 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 16th, 2025 02:48:39 EDT -0400 HVO Ta'u Island GREEN/NORMAL - No activity of concern for Taʻū Island
Apr 3, 2025 21:02 - 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 16th, 2025 02:48:39 EDT -0400 HVO Tutuila Island GREEN/NORMAL - No activity of concern for Tutuila Island
Apr 3, 2025 21:02 - 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 16th, 2025 02:48:39 EDT -0400 HVO Mauna Loa GREEN/NORMAL - No significant changes at Mauna Loa in the past month; slow inflation of the summit continues.
Apr 3, 2025 20:59 - Seismicity beneath Mauna Loa's summit and upper-elevation flanks has been low over the past month; approximately 86 small-magnitude earthquakes (most below M1.5) were detected, which is expected for the post-eruption phase of this volcano and slightly higher than 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 ...
April 16th, 2025 02:48:39 EDT -0400 HVO Kama'ehuakanaloa UNASSIGNED/UNASSIGNED - No activity of concern for Kamaʻehuakanaloa.
Apr 3, 2025 20:59 - Seismicity has been low at Kamaʻehuakanaloa volcano (formerly Lōʻihi Seamount) over the past several months. There have been about 20 earthquakes in the past month, which is representative of background activity at the volcano; all earthquakes were of small magnitudes (below M3.0).
April 16th, 2025 02:48:39 EDT -0400 HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
Apr 3, 2025 20:59 - 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 16th, 2025 02:48:39 EDT -0400 HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā.
Apr 3, 2025 20:59 - 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.
April 16th, 2025 02:48:39 EDT -0400 HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea.
Apr 3, 2025 20:59 - No significant activity was detected at Mauna Kea volcano during the past month. Seismic activity was at background levels at the volcano. The continuously recording Global Positioning System (GPS) instrument on Mauna Kea (operated by NASA’s Jet Propulsion Laboratory) showed no change.

 

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].