Alaska Volcano Observatory

Lava continues to slowly erupt within the summit crater at Great Sitkin Volcano. Cloudy conditions obscured satellite and webcam 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 remains elevated, with numerous small earthquakes, frequent infrasound detections, and periods of volcanic tremor being observed throughout the week. Minor steaming was also consistently observed in daytime webcam views, and sulfur dioxide emissions were seen in satellite data most days. Barely elevated surface temperatures, probably related to the gas plume, were also seen occasionally at the volcano's summit in satellite views.

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.