USGS Volcano Notice - DOI-USGS-AVO-2025-12-09T20:42:21+00:00

Lava continues to erupt in the summit crater of Great Sitkin Volcano at a low rate with minor seismic activity. Slightly elevated surface temperatures were evident in a few satellite views over the past day. Clouds obscured web camera views. 

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.

Shishaldin Volcano continues to experience unrest. Webcam images captured yesterday revealed a minor steam plume rising from the summit. Over the past 24 hours, occasional small earthquakes and infrasound signals have been detected. These signals could be caused by gas bubbles bursting deep within the crater. Satellite views, under clear conditions, showed possibly elevated surface temperatures at the summit crater. Hot gases are likely responsible for the thermal signals observed.

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.