Alaska Volcano Observatory

Lava continues to erupt in the summit crater of Great Sitkin Volcano. Occasional small earthquakes and seismic signals suggestive of rockfalls from the steep sides of the lava dome were detected over the past day. Satellite and webcam observations were obscured by clouds. 

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.

Frequent small earthquakes and weak infrasound signals were detected by the local monitoring network at Shishaldin Volcano over the past day but were mostly masked by strong wind noise. Satellite and webcam observations were obscured by clouds. 

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.