USGS Volcano Notice - DOI-USGS-AVO-2025-01-16T20:38:19+00:00

Lava continued to erupt slowly in the summit crater of Great Sitkin Volcano over the past day. This activity was accompanied by weak seismicity, with occasional small earthquakes being detected. Webcam and satellite views of the volcano were cloudy.

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 shallow volcanic earthquakes detected beneath the volcano over the past day. No activity was observed in satellite and webcam views. 

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.