Alaska Volcano Observatory

Satellite radar imagery through October 23 confirms that the slow eruption of lava in the summit crater continues at Great Sitkin Volcano. Small earthquakes associated with the ongoing lava eruption continue. Nothing unusual was observed in cloudy satellite and web camera imagery.  

A single explosive event occurred in May 2021 and was followed by the ongoing eruption of lava that began in July 2021. No explosive events have occurred since May 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.

No major changes were detected in the past day at Mount Spurr. Seismicity remains elevated with several small earthquakes detected. No unusual activity was observed in cloudy satellite or web camera data 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 proceeded 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.