USGS Volcano Notice - DOI-USGS-AVO-2025-02-08T19:19:43+00:00

Lava continues to erupt slowly in the summit crater of Great Sitkin Volcano. Seismicity has been quiet over the past day.  Clouds blocked views of the volcano in web camera and satellite images.

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.

Unrest continues at Mount Spurr, with numerous small, shallow volcanic earthquakes detected beneath the volcano over the past day. Currently, most of the them are occurring under the Crater Peak vent, with some also located under the summit of Mount Spurr. 

A field team visited the volcano yesterday to dig out snow-covered stations and make repairs. They report no major changes to the Crater Peak vent, and continued degassing from the summit crater. They also took airborne gas measurements, from which the data are still being processed. The webcam at station CKT is now returning images again, which are available here. 

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.