Alaska Volcano Observatory

Lava continues to slowly erupt within the summit crater at Great Sitkin Volcano. Cloudy conditions obscured satellite and web camera views of the volcano throughout the week. Seismic activity remains low, with the detection of 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. 

Signs of volcanic unrest at Shishaldin Volcano continue. Seismic and infrasound activity remain elevated, with numerous small earthquakes, frequent infrasound signals, and intermittent volcanic tremor recorded throughout the week. Daytime web camera views consistently showed minor to vigorous steaming, and sulfur dioxide emissions were detected in satellite data from February 28 through March 3 and again today. Satellite observations on February 28 also showed slightly elevated surface temperatures near the summit, likely associated with hot gas emissions.

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.