USGS Volcano Notice - DOI-USGS-AVO-2025-02-22T19:51:19+00:00

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Saturday, February 22, 2025, 11:04 AM AKST (Saturday, February 22, 2025, 20:04 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 slowly in the summit crater of Great Sitkin Volcano. Small earthquakes continue. Typical minor steaming from the vent region was observed in a high-resolution satellite image from yesterday afternoon.

The current eruption of Great Sitkin Volcano began with a single explosive event in May 2021. The ongoing eruption of lava at the summit began shortly afterward, in July 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: ADVISORY
Current Aviation Color Code: YELLOW

Unrest continues at Mount Spurr, with numerous small, shallow volcanic earthquakes detected beneath the volcano. Earthquakes are primarily being located under the Spurr summit vent. Views from the CTK camera continued to be by snow cover and satellite observations were obscured by clouds over the past day.

AVO continues to monitor activity at Mount Spurr for signals that would indicate that the volcano is moving closer to an eruption. Based on previous eruptions, changes from current activity in the earthquakes, ground deformation, summit lake, and fumaroles would be expected if magma began to move closer to the surface. Therefore, it is very likely that if an eruption were to occur it would be preceded by additional signals that would allow advance warning.

The volcano is monitored using local seismic, infrasound, web camera, and GNSS 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

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

Activity remains low at the Atka volcanic complex. Several small local seismic events were observed over the past day, but the overall level of seismicity is very low. Satellite and web camera observations were obscured by clouds over the past day.

AVO has detected no activity since a small explosion at the summit of Korovin Volcano on the evening of February 20. Korovin is one of the volcanoes that makes up the Atka volcanic complex.

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

CONTACT INFORMATION:

Matt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497

Ronni Grapenthin, Acting Coordinating Scientist, UAFGI, rgrapenthin@alaska.edu (907) 378-5460

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.