Alaska Volcano Observatory

Lava continues to slowly erupt within the summit crater at Great Sitkin Volcano. Minor lava dome growth to the southwest and rockfalls down the south side of the lava field continue. There was also visible advance of the small lava lobe to the southeast this week.  Satellite and web camera views were cloudy for most of the week but elevated surface temperatures from the warm, active lava dome were observed when viewing conditions allowed. Seismic activity remains low, with occasional small volcanic earthquakes and seismic signals from small rockfalls within the crater.  

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 and infrasound sensors, satellite data, and web cameras, and regional infrasound and lightning networks.

Volcanic unrest at Shishaldin Volcano continues. Seismic and infrasound activity remain elevated, with numerous small earthquakes, frequent infrasound signals, and volcanic tremor recorded throughout the week. Elevated sulfur dioxide gas emissions were detected in satellite data every day this week.

Shishaldin Volcano is monitored by local seismic and infrasound sensors, web cameras, and a telemetered geodetic network. In addition to the local monitoring network, the Alaska Volcano Observatory uses nearby geophysical networks, regional infrasound and lightning data, and satellite data to monitor the volcano.