USGS Volcano Notice - DOI-USGS-AVO-2026-08-01T19:08:13+00:00

Slow eruption of lava within the summit crater continues. Minor earthquakes were detected over the past day and typical steaming was observed in a high resolution satellite image. Web camera observations were obscured by clouds.

The current eruption began in July 2021 and, since then, lava flows have 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.

Earthquake activity was very low over the past day. Satellite and web camera observations were obscured by clouds.  

A new temporary monitoring station was installed recently near Mount Kupreanof and is providing seismic data, infrasound data, gas measurements, and web camera images on an intermittent basis. This is by design to conserve battery power, but the frequency of data acquisition can be increased if activity warrants. The closest functioning seismometers that provide continuous data are approximately 10 miles (16 km) to the northeast of the volcano as part of the Mount Veniaminof network. Mount Kupreanof is also monitored by satellite data, remote infrasound and lightning networks, and visual observations from pilots and mariners passing by the volcano.

Minor seismic activity and infrasound were detected at the volcano during the past day. Sulfur dioxide emissions were observed in satellite data from yesterday afternoon. Satellite and web camera observations of the volcano 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 lightning data, and satellite images to detect eruptions.