Alaska Volcano Observatory

Lava continues to erupt in the summit crater of Great Sitkin Volcano at a low rate. A snow-free portion of the slowly growing lava dome was visible in clear webcam views yesterday. Elevated surface temperatures at the summit were observed in clear satellite views last night. A few small earthquakes were recorded 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 and web cameras, and regional infrasound and lightning networks.

Unrest continues at Shishaldin. A ground-hugging steam plume was visible in webcam images yesterday. Occasional small earthquakes and infrasound signals, possibly caused by gas bubbles bursting deep within the crater, occurred over the past day. Slightly elevated surface temperatures at the summit were observed in clear overnight satellite views. 

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 lighting data, and satellite images to detect eruptions.