USGS Volcano Notice - DOI-USGS-AVO-2025-08-21T19:44:32+00:00

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Thursday, August 21, 2025, 11:45 AM AKDT (Thursday, August 21, 2025, 19:45 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

Lava continues to erupt in the summit crater of Great Sitkin Volcano. Small earthquakes and rockfall signals were detected over the past day. Satellite and web camera observations were obscured by clouds.

The current lava eruption began in July 2021 and 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 regional infrasound and lightning networks.

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

CONTACT INFORMATION:

Michelle Coombs, Acting Scientist-in-Charge, USGS mcoombs@usgs.gov (907) 786-7497

David Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (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.