USGS Volcano Notice - DOI-USGS-AVO-2025-08-20T20:00:16+00:00

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Wednesday, August 20, 2025, 12:09 PM AKDT (Wednesday, August 20, 2025, 20:09 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. No significant changes were observed in satellite images over the past day. Web camera view 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

SPURR (VNUM #313040)
61°17'56" N 152°15'14" W, Summit Elevation 11070 ft (3374 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Following months of decreased signs of volcanic unrest, the Aviation Color Code and Volcano Alert Level were decreased to GREEN/NORMAL earlier today. More details at this link: Spurr VAN/VONA

The volcano is monitored using local seismic, infrasound, web camera, and GNSS (GPS) stations along with regional infrasound, lightning networks, and satellite data.

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

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.