USGS Volcano Notice - DOI-USGS-AVO-2024-08-14T19:02:30+00:00

Lava continues to slowly erupt at Great Sitkin Volcano, feeding a thick lava flow that is gradually filling the summit crater. The volcano was obscured by clouds in satellite and webcam views. Small earthquakes continued to be detected beneath the volcano.

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 earthquakes and weak seismic tremor were detected in local seismic data. The only other notable activity observed was a sulfur dioxide gas plume emanating from the volcano in satellite data. 

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.