USGS Volcano Notice - DOI-USGS-AVO-2024-06-23T18:32:56+00:00

The slow eruption of lava in the summit crater of Great Sitkin Volcano continues. A few small earthquakes were detected beneath the volcano over the past day. Barely elevated surface temperatures were observed in satellite data. These observations are typical for this current eruptive period.  

The current lava flow eruption began in July 2021. No explosive events have occurred since a single event in May 2021.

Local seismic and infrasound sensors and web cameras are used to monitor Great Sitkin along with regional infrasound and lightning networks and satellite data.

Minor unrest at Shishaldin Volcano continues, with small, low-frequency earthquakes and seismic tremor occurring over the past day. Sulfur dioxide gas emissions were detected in satellite data yesterday afternoon. These observations are typical for this post-eruption period. 

Minor rock falls associated with collapse events from the unstable ground in and near the summit crater may occur. The collapse events can generate small clouds of dust likely composed of fine-grained ash. The diffuse dust clouds dissipate quickly and can produce irregular-shaped deposits near the summit. The last significant ash-producing eruption occurred in November 2023. 

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.