Alaska Volcano Observatory

Lava continues to erupt slowly at Great Sitkin Volcano, adding to a thick lava flow that fills most of the summit crater.  Small earthquakes associated with the ongoing lava eruption continue at a low rate. Clouds obscured the volcano in satellite and web camera views over the past day. A single explosive event occurred in May 2021 and was followed by the ongoing eruption of lava that began in July 2021. Local seismic and infrasound sensors and web cameras are used to monitor Great Sitkin along with regional infrasound and lightning networks and satellite data.

Unrest continues at Mount Spurr. The number of shallow earthquakes underneath the summit region remains above background. Clouds have obscured the volcano in satellite and web camera views over the past day. AVO continues to closely 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.

Local seismic, infrasound, web cameras, and GNSS stations are used to monitor Mount Spurr along with regional infrasound, lightning networks and satellite data.