Alaska Volcano Observatory

Satellite radar imagery over the past week showed that the south flank of the active lava dome within the summit crater of Great Sitkin Volcano continues to move very slowly southward. Although conditions were mostly cloudy, a few clear views of the volcano during the week showed the typical steam plume from the dome and slightly elevated surface temperatures. Seismic activity remains low with occasional small volcanic earthquakes and signals from minor rockfalls caused by lava flow growth.

Because the ongoing summit eruption at Great Sitkin Volcano has been stable and changing very slowly, AVO stopped issuing Daily Updates earlier this week. We will, however, continue to issue these Weekly Updates. If the character of the eruption changes, or if other volcanoes show signs of unrest, AVO will resume issuing Daily Updates.

The current lava eruption began in July 2021 and has filled most of the summit crater and advanced into the valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic, geodetic, and infrasound sensors, satellite data, and web cameras, and regional infrasound and lightning networks.