USGS Volcano Notice - DOI-USGS-AVO-2024-05-20T20:27:31+00:00

The slow eruption of lava in the summit crater of Great Sitkin Volcano continues. Occasional small earthquakes occurred throughout the past day. Satellite views were obscured by clouds. Clear webcam views showed steaming from the active summit lava flow. 

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.

Unrest at Shishaldin Volcano continues. Elevated seismicity continues with low-level volcanic tremor and earthquake activity observed over the past day. Webcam and satellite views were cloudy over the past day.

Minor rock falls associated with collapse events from the unstable ground in and near the summit crater may generate very small clouds of fine-grained ash that dissipate quickly and leave behind local deposits in the immediate vicinity of the summit. The last significant ash-producing eruption occurred in 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.