USGS Volcano Notice - DOI-USGS-AVO-2025-06-11T17:33:09+00:00

Unrest continues at Mount Spurr volcano, with small volcanic earthquakes continuing to occur beneath the volcano. A small steam plume was observed in clear webcam views over the last 24 hours. No noteworthy activity was observed in satellite views.

Although low-level unrest continues, no changes have been observed in the monitoring data to 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 conditions, and fumarolic activity would be expected if magma began to move closer to the surface. Therefore, if an eruption occurred, it would be preceded by additional signals allowing warning.

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

Lava continues to erupt slowly in the summit crater of Great Sitkin Volcano. Seismicity remains at low levels with occasional small earthquakes detected, including signals possibly caused by small rockfalls from the growing summit lava dome. Satellite and webcam views were mostly cloudy over the last 24 hours.

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.