Great Sitkin

Country: United States
Volcanic Region Group: North America Volcanic Regions
Volcanic Region: Aleutian Ridge Volcanic Arc
Volcano Landform: Composite
Primary Volcano Type: Stratovolcano
Activity Evidence: Eruption Observed
Last Known Eruption: 2025 CE
Latitude: 52.076
Longitude: -176.13
Elevation (meters): 1740
Tectonic Setting: Subduction zone / Intermediate crust (15-25 km)
Dominant Rock Type: Andesite / Basaltic Andesite
Last Updated: 2026-06-08 20:08:46

Current Ash Alerts

Title: No Ash Alerts
Description: No Ash Alerts
Link: #
Guid: #

General News

Title: Great Sitkin (United States) - Report for 5 March-11 March 2025
Description:

The Alaska Volcano Observatory (AVO) reported that slow lava effusion continued to feed a thick flow in Great Sitkin?s summit crater during 20-27 May. Small earthquakes associated with lava dome growth and rockfalls were detected in seismic data on most days. Weather clouds often prevented webcam and satellite observations, though slightly elevated surface temperatures were visible in satellite images during 22-23 May. The Volcano Alert Level remained at Watch (the third level on a four-level scale) and the Aviation Color Code remained at Orange (the third color on a four-color scale).

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Link: https://volcano.si.edu/reports_weekly.cfm
Guid: https://volcano.si.edu/reports_weekly.cfm#vn_311120

Current Alert Status

Alert Level: WATCH
Color Code: ORANGE
Cap Certainty: Likely
Cap Severity: Minor
Cap Urgency: Expected
Is Elevated Cap: 1
Prev Elevated Cap:
Notice Identifier: DOI-USGS-AVO-2026-06-08T18:40:45+00:00
Pub Date: 2026-06-08 20:08:46
Sent Date Cap: 2026-06-08 20:08:46
Cap Expires: 2026-06-09 20:08:46
Mail Subject: AVO Daily Update 20260608_1208
Author: [email protected]
Synopsis: Slow eruption of lava within the summit crater continues.
Guid: DOI-USGS-AVO-2026-06-08T18:41:04+00:00
Prev Guid: DOI-USGS-AVO-2021-05-27T12:44:01-08:00
Msg Type: Alert
Notice Type Cd: DU
Notice URL: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-AVO-2026-06-08T18:40:45+00:00
Prev Notice URL: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-AVO-2021-05-27T12:44:01-08:00
Notice Data: https://volcanoes.usgs.gov/hans-public/api/notice/getNotice/DOI-USGS-AVO-2026-06-08T18:40:45+00:00
Highest Alert Level: WATCH
Highest Color Code: ORANGE
Volcano Cds CSV: ak111,ak252,ak175

Notice Sections:

lat: 52.0765
lng: -176.1109
vnum: 311120
vName: Great Sitkin
region: Aleutians
vImage:
summary:

Slow eruption of lava continues. Minor seismicity detected over the past day.  Continued advance of the eastern lava flow and continued growth of the lava dome was observed high spatial resolution satellite from June 6.  No other activity was observed in clear to partly cloudy satellite data.

The current eruption began in July 2021 and, since then, lava flows have 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.

synopsis: AVO Great Sitkin ORANGE/WATCH - Slow eruption of lava within the summit crater continues.
colorCode: ORANGE
sectionId: DOI-USGS-AVO-2026-06-08T18:41:04+00:00
alertLevel: WATCH
sectionHtml:

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Monday, June 8, 2026, 12:08 PM AKDT (Monday, June 8, 2026, 20:08 UTC)


GREAT SITKIN (VNUM #311120)
52°4'35" N 176°6'39" W, Summit Elevation 5709 ft (1740 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Summary: Slow eruption of lava within the summit crater continues.

Slow eruption of lava continues. Minor seismicity detected over the past day.  Continued advance of the eastern lava flow and continued growth of the lava dome was observed high spatial resolution satellite from June 6.  No other activity was observed in clear to partly cloudy satellite data.

The current eruption began in July 2021 and, since then, lava flows have 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.



To view monitoring data and other information about Great Sitkin Volcano: https://avo.alaska.edu/volcano/great-sitkin




This notice contains volcanoes not displayed here: Shishaldin (ADVISORY/YELLOW), Kupreanof (ADVISORY/YELLOW).



CONTACT INFORMATION:

Matt Haney, Scientist-in-Charge, USGS, [email protected] (907) 786-7497

David Fee, Coordinating Scientist, UAFGI, [email protected] (907) 378-5460



Contact AVO: https://avo.alaska.edu/contact

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

lat: 56.0126
lng: -159.7912
vnum: 312060
vName: Kupreanof
region: Alaska Peninsula
vImage:
summary:

Occasional earthquakes continued over the past day. Steaming from the fumarole field field located to the west of the summit of Mount Kupreanof was observed in high spatial resolution satellite images. No other activity was observed in satellite data. 

There is no real-time geophysical monitoring network at Mount Kupreanof. The closest functioning seismometers are approximately 17 miles (27 km) to the east of the volcano as part of the Mount Veniaminof network. Mount Kupreanof is also monitored by satellite data, remote infrasound and lightning networks, and visual observations from pilots and mariners passing by the volcano. 

synopsis: AVO Kupreanof YELLOW/ADVISORY - Occasional earthquake activity continues.
colorCode: YELLOW
sectionId: DOI-USGS-AVO-2026-06-08T18:41:44+00:00
alertLevel: ADVISORY
sectionHtml:

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Monday, June 8, 2026, 12:08 PM AKDT (Monday, June 8, 2026, 20:08 UTC)


KUPREANOF (VNUM #312060)
56°45" N 159°47'28" W, Summit Elevation 6217 ft (1895 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Summary: Occasional earthquake activity continues.

Occasional earthquakes continued over the past day. Steaming from the fumarole field field located to the west of the summit of Mount Kupreanof was observed in high spatial resolution satellite images. No other activity was observed in satellite data. 

There is no real-time geophysical monitoring network at Mount Kupreanof. The closest functioning seismometers are approximately 17 miles (27 km) to the east of the volcano as part of the Mount Veniaminof network. Mount Kupreanof is also monitored by satellite data, remote infrasound and lightning networks, and visual observations from pilots and mariners passing by the volcano. 



To view monitoring data and other information about Mount Kupreanof: https://avo.alaska.edu/volcano/kupreanof 




This notice contains volcanoes not displayed here: Great Sitkin (WATCH/ORANGE), Shishaldin (ADVISORY/YELLOW).



CONTACT INFORMATION:

Matt Haney, Scientist-in-Charge, USGS, [email protected] (907) 786-7497

David Fee, Coordinating Scientist, UAFGI, [email protected] (907) 378-5460



Contact AVO: https://avo.alaska.edu/contact

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

lat: 54.7554
lng: -163.9711
vnum: 311360
vName: Shishaldin
region: Aleutians
vImage:
summary:

Unrest continues. Minor seismic activity and infrasound were detected at the volcano. A robust degassing plume from the summit crater was observed in clear web cam images and satellite data from yesterday afternoon showed typical sulfur dioxide emissions. No other activity was observed in satellite data.

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. 

synopsis: AVO Shishaldin YELLOW/ADVISORY - Ongoing volcanic unrest is indicated by seismic activity and infrasound events. Sulfur dioxide gas emissions were observed in satellite data and a steam plume was observed in web cam.
colorCode: YELLOW
sectionId: DOI-USGS-AVO-2026-06-08T18:41:26+00:00
alertLevel: ADVISORY
sectionHtml:

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Monday, June 8, 2026, 12:08 PM AKDT (Monday, June 8, 2026, 20:08 UTC)


SHISHALDIN (VNUM #311360)
54°45'19" N 163°58'16" W, Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Summary: Ongoing volcanic unrest is indicated by seismic activity and infrasound events. Sulfur dioxide gas emissions were observed in satellite data and a steam plume was observed in web cam.

Unrest continues. Minor seismic activity and infrasound were detected at the volcano. A robust degassing plume from the summit crater was observed in clear web cam images and satellite data from yesterday afternoon showed typical sulfur dioxide emissions. No other activity was observed in satellite data.

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. 



To view monitoring data and other information about Shishaldin Volcano: https://avo.alaska.edu/volcano/shishaldin




This notice contains volcanoes not displayed here: Great Sitkin (WATCH/ORANGE), Kupreanof (ADVISORY/YELLOW).



CONTACT INFORMATION:

Matt Haney, Scientist-in-Charge, USGS, [email protected] (907) 786-7497

David Fee, Coordinating Scientist, UAFGI, [email protected] (907) 378-5460



Contact AVO: https://avo.alaska.edu/contact

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

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