Alaska Volcano Observatory

Lava continues to erupt slowly in the summit crater of Great Sitkin Volcano, and small earthquakes continue at a low rate. Satellite and webcam views of the volcano over the past day were obscured by clouds.

The current eruption of Great Sitkin Volcano began with a single explosive event in May 2021. The ongoing eruption of lava at the summit began shortly afterward, in July 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data and web cameras, and regional infrasound and lightning networks.

Unrest continues at Mount Spurr volcano. Frequent small volcanic earthquakes were detected beneath the volcano over the last day. Most of the earthquakes that are occurring under the volcano are too small to be located. Nothing unusual was observed in partly cloudy satellite views, but weak steaming at the summit of the volcano was seen in clear webcam images.

Results from the most recent overflight on April 24 show that gas emissions are broadly unchanged from March and remain elevated above background levels. 

Although unrest continues, there have been no changes observed in the monitoring data to indicate that the volcano is moving closer to an eruption. Based on previous eruptions, changes from current activity in the earthquakes, ground deformation, summit lake conditions, and fumarolic activity would be expected if magma began to move closer to the surface. Therefore, if an eruption occurred, it would be preceded by additional signals allowing warning.

The volcano is monitored using local seismic, infrasound, web camera, and GNSS (GPS) stations along with regional infrasound, lightning networks and satellite data.

AVO has detected no activity since a small explosion at the summit of Korovin Volcano on the morning of April 25. Korovin is one of the volcanoes that makes up the Atka volcanic complex. Satellite and webcam views were cloudy over the last day. Seismicity is currently low. 

The Atka volcanic complex is monitored by local seismic and infrasound sensors and webcam, satellite data, and regional lightning detection instruments.