Alaska Volcano Observatory |
Alaska Volcano Observatory
Volcanoes
Webcams
Webcams
Ashcam GUI
News
Explore Data
Explore Data
References
Webicorder
Hazard Alert System
Eruptions
Geochem
Locations
Glossary
Images
Get Involved
About AVO
About AVO
Staff
Study Areas
Alert Levels
FAQ
Great Sitkin
Alert Level: WATCH
Color Code: ORANGE
Details
Aleutians
(52.0765, -176.1109)
Great Sitkin
ORANGE
WATCH
2026-04-23 20:36:10 UTC
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.
5709 ft (1740m)
elevation
Instrumented
Shishaldin
Alert Level: ADVISORY
Color Code: YELLOW
Details
Aleutians
(54.7554, -163.9711)
Shishaldin
YELLOW
ADVISORY
2026-04-23 20:36:10 UTC
Unrest persists at Shishaldin Volcano, with seismic and infrasound activity remaining elevated over the past day. Satellite and web camera views of the volcano were obscured by clouds.
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.
9373 ft (2857m)
elevation
Instrumented
The Alaska Volcano Observatory (AVO) is a consortium of the
U.S. Geological Survey
, the
University of Alaska Fairbanks Geophysical Institute
, and the
State of Alaska Division of Geological & Geophysical Surveys
USGS Volcano Notification Service
Contact AVO
Information Quality
FOIA
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137 and G23AC00070.
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.