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Updated:  17/11/2025 09:45 
 


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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

November 17th, 2025 04:47:15 EST -0500 AVO Great Sitkin ORANGE/WATCH - Slow eruption of lava within the summit crater continues.
Nov 16, 2025 20:46 - Lava continues to erupt in the summit crater of Great Sitkin Volcano. Seismicity at the volcano is at a low level, with occasional small earthquakes occurring over the past day. No significant activity was observed in partly cloudy satellite and webcam views. 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 and web cameras, and ...
November 17th, 2025 04:47:15 EST -0500 AVO Shishaldin YELLOW/ADVISORY - Small earthquakes continue.
Nov 16, 2025 20:46 - Unrest continues at Shishaldin with frequent small earthquakes detected over the past day. No significant activity was observed in partly cloudy satellite and web camera views.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 lighting data, and satellite images to detect eruptions.
November 17th, 2025 04:47:15 EST -0500 HVO Kilauea ORANGE/WATCH - The Kīlauea summit eruption is paused. Glow continued from the south and north vents overnight. The current forecast window for episode 37 is November 21–25.
Nov 16, 2025 19:17 - Activity Summary:The Kīlauea summit eruption is paused. Overnight, the south vent showed persistent glow, while rare glow was visible from the north vent. Inflationary tilt is being recorded by summit tiltmeters. Models suggests that episode 37 could occur between November 21 to November 25. Summit Observations:Glow was observed from both vents overnight. The glow varied from weak to strong, mainly visible from the south vent. Tremor spikes continue every 5–10 minutes and appear to be related to gas pistoning deeper in the vents.UWD recorded just under 1 microradian of ...
November 17th, 2025 04:47:15 EST -0500 CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
Nov 14, 2025 19:01 - Activity Update: All volcanoes in the Cascade Range of Washington and Oregon 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. Yesterday, a field crew performed maintenance ...
November 17th, 2025 04:47:15 EST -0500 NMI Ahyi Seamount YELLOW/ADVISORY - No unusual activity observed in satellite or seismic data.
Nov 14, 2025 00:05 - Signs of unrest at Ahyi Seamount have been observed routinely in satellite data over the past few weeks with plumes of discolored water observed drifting up to 1 mile (1.6 km) away from the volcano in satellite images on October 20, 21, 26, 28 and November 5. No high resolution satellite data were available over the past week. There was one signal observed on underwater pressure sensors near Wake Island (1,410 miles east of Ahyi) that may be related to activity at Ahyi. No other signals were detected from the direction of Ahyi Seamount from these hydroacoustic array data, ...
November 17th, 2025 04:47:15 EST -0500 CALVO GREEN/NORMAL - CA volcanoes were at normal background levels of seismicity and deformation during the past week.
Nov 11, 2025 21:34 - 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 November 03 (0000h PST) to November 09 (2359h PST):Typical seismicity was recorded at The Geysers geothermal field south of the ...
November 17th, 2025 04:47:15 EST -0500 HVO Ofu-Olosega GREEN/NORMAL - No activity of concern for Ofu-Olosega.
Nov 6, 2025 19:29 - 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.
November 17th, 2025 04:47:15 EST -0500 HVO Ta'u Island GREEN/NORMAL - No activity of concern for Taʻū Island
Nov 6, 2025 19:29 - 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.
November 17th, 2025 04:47:15 EST -0500 HVO Tutuila Island GREEN/NORMAL - No activity of concern for Tutuila Island
Nov 6, 2025 19:29 - 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.
November 17th, 2025 04:47:15 EST -0500 HVO Mauna Loa GREEN/NORMAL - No significant changes at Mauna Loa in the past month; slow inflation of the summit continues.
Nov 6, 2025 19:21 - Mauna Loa seismicity rates increased by approximately 75% relative to last month; however, this rate is still within background levels for this volcano. A total of 151 M1+ and smaller earthquakes were detected beneath Mauna Loa's summit region, as well as 3 M2+ and 1 M3+ earthquake. Data from Global Positioning System (GPS) instruments on Mauna Loa have continued to show only minor inflation beneath 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 ...
November 17th, 2025 04:47:15 EST -0500 HVO Kama'ehuakanaloa UNASSIGNED/UNASSIGNED - No activity of concern for Kamaʻehuakanaloa.
Nov 6, 2025 19:21 - No significant activity was detected at Kamaʻehuakanaloa (formerly Lōʻihi 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 (below M2+).
November 17th, 2025 04:47:15 EST -0500 HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
Nov 6, 2025 19:21 - 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; all earthquakes were of small magnitudes (
November 17th, 2025 04:47:15 EST -0500 HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā.
Nov 6, 2025 19:21 - 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.
November 17th, 2025 04:47:15 EST -0500 HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea.
Nov 6, 2025 19:21 - 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; all earthquakes were of small magnitudes (majority of events M1+ and smaller).
November 17th, 2025 04:47:15 EST -0500 AVO Katmai GREEN/NORMAL - Resuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN/NORMAL.
Nov 5, 2025 22:43 - 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 ...

 

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].