USGS Volcano Notice - DOI-USGS-AVO-2026-02-15T19:15:23+00:00

Lava continues to erupt slowly within the summit crater of Great Sitkin Volcano. A deposit from a small rockfall on the south flank of the lava dome was observed in a satellite image and in a web camera image from yesterday afternoon.  The deposit was about 1000 ft (300 m) long and confined to the summit crater. Moderately elevated surface temperatures were observed at the source of the rockfall, near the vent region on the south side of the lava dome. Rockfalls such as these are typical for growing lava domes, and unless they become significantly larger, do not pose a hazard outside the immediate vicinity of the dome in summit crater. Seismic signals generated by the rockfall(s) were observed in data over the past day, but overall seismic activity continues at a very low level. 

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 periods of volcanic tremor being observed. Minor steaming from the summit crater was observed in web camera images over the past day. 

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.