Alaska Volcano Observatory

Lava continues to erupt slowly within the summit crater of Great Sitkin Volcano. Seismic activity continues at a very low level. Satellite and webcam images were cloudy over the past day. 

The current lava eruption began in July 2021 and, since then, has filled most of the summit crater and advanced into 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, webcams, and regional infrasound and lightning networks.

Unrest continues at Shishaldin Volcano. Seismic activity remains elevated, with numerous small earthquakes and intermittent episodes of volcanic tremor detected. Satellite and web camera images show a strong steam and gas plume, which was also reported by passing pilots. Satellite data further indicate ongoing sulfur dioxide emissions from the volcano.

Local seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions.