USGS Volcano Notice - DOI-USGS-AVO-2024-03-28T20:58:52+00:00

Slow eruption of lava in the summit crater of Great Sitkin Volcano continues. Seismicity was low over the past day. Webcam images yesterday showed a white steam plume above the active lava dome at the summit. 

The current lava flow began erupting 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.

Low-level unrest continues at Shishaldin Volcano. A few small earthquakes were detected over the past day.  Clouds obscured satellite and webcam views. 

No significant eruptive activity has been observed since 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. 

A small explosion occurred at the summit of Korovin volcano, one of the volcanoes in the Atka volcanic complex, yesterday at 19:36 AKDT (03:36 UTC March 28). It was detected in local infrasound and seismic data and was followed by a few minutes of elevated seismic tremor. Since then, seismic activity has continued to be above background. Satellite and web-camera views have been mostly obscured by clouds since the explosion, but a few clearer looks suggest that it did not produce any ash. 

The explosion and seismic activity has caused AVO to increase the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. AVO continues to carefully monitor for signs of additional unrest that could lead to an eruption. The Atka volcanic complex is monitored by local seismic and infrasound sensors and webcam, satellite data, and regional lightning detection instruments.