Alaska Volcano Observatory

Lava continues to erupt slowly within the summit crater. Satellite data indicate gradual eastward expansion of the lava dome. Although clouds limited most satellite and web camera views last week, field teams observed steam emissions from the summit (https://avo.alaska.edu/image/view/197476).  Seismic activity remains low, with only occasional minor volcanic earthquakes and signals from small rockfalls.

The current lava eruption began in July 2021 and has filled most of the summit crater and advanced into the valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic, geodetic, and infrasound sensors, satellite data, and web cameras, and regional infrasound and lightning networks.

Volcanic activity remains elevated, with frequent small earthquakes, ongoing tremor, and occasional infrasound signals from minor explosions in the conduit. Steam plumes are visible in web camera images during clear weather.  Satellite data detected sulfur dioxide gas emissions on 4 days this past week.

Shishaldin Volcano is monitored by local seismic and infrasound sensors, web cameras, and a telemetered geodetic network. In addition to the local monitoring network, the Alaska Volcano Observatory uses nearby geophysical networks, regional infrasound and lightning data, and satellite data to monitor the volcano. 

Mount Kupreanof continues to exhibit low-level unrest, with occasional local earthquakes and steam emissions observed in web camera images. Seismic activity remained low throughout the week, and no sulfur dioxide emissions have been detected since August 21.

A new temporary monitoring station was installed near Mount Kupreanof in July 2026 and is intermittently providing seismic data, infrasound data, gas measurements, and web camera images. Intermittent data transmission 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.