USGS Volcano Notice - DOI-USGS-AVO-2025-06-17T19:39:04+00:00

Unrest continues at Mount Spurr volcano, with occasional, small volcanic earthquakes continuing to occur beneath the volcano. No noteworthy activity was seen in mostly clear satellite or webcam images over the last 24 hours. An AVO field crew is at the volcano today performing maintenance and upgrades to the monitoring network. 

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. Webcam and satellite views over the past 24 hours were obscured by clouds.

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.