USGS Volcano Notice - DOI-USGS-AVO-2025-10-30T18:56:53+00:00

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Thursday, October 30, 2025, 11:03 AM AKDT (Thursday, October 30, 2025, 19:03 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. Seismicity at the volcano is at a low level, with occasional small earthquakes occurring over the past day. Nothing unusual was observed in mostly 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 regional infrasound and lightning networks.

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

ATKA VOLCANIC COMPLEX (VNUM #311160)
52°19'51" N 174°8'20" W, Summit Elevation 5030 ft (1533 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

AVO has detected no activity since a small explosion at the summit of Korovin Volcano on the evening of October 29. Korovin is one of the volcanoes that makes up the Atka volcanic complex. Satellite and webcam views were mostly cloudy over the last day. Seismicity is currently low.

The Atka volcanic complex is monitored by local seismic and infrasound sensors and webcam, satellite data, and regional lightning detection instruments.

To view monitoring data and other information about the Atka volcano complex: https://avo.alaska.edu/volcano/atka-volcanic-complex

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

Frequent small earthquakes were detected over the past day. No activity was observed in cloudy satellite and webcam 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.

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

CONTACT INFORMATION:

Matt Haney, Scientist-in-Charge, USGS mhaney@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.