USGS Volcano Notice - DOI-USGS-AVO-2024-07-21T19:39:58+00:00

No significant changes were seen at Great Sitkin Volcano, where lava continues to slowly erupt within the summit crater. Over the past day, small earthquakes continued to be detected beneath the volcano. Satellite and web camera views were obscured by clouds.  

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.

No major changes were detected in the past day at Shishaldin Volcano, where minor volcanic unrest continues. Small, low-frequency earthquakes were detected. Satellite and web camera views were mostly obscured by clouds but minor sulfur dioxide gas emissions were detected.

Minor rock falls associated with collapse of the unstable summit crater area may occur without warning. This can lead to small clouds of dust (volcanic ash), which dissipate quickly and create dark-colored deposits near the summit. There have been no significant ash-producing explosive eruptions 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.