USGS Volcano Notice - DOI-USGS-AVO-2024-05-23T19:20:51+00:00

The slow eruption of lava in the summit crater of Great Sitkin Volcano continues. A satellite radar image acquired yesterday shows continuing, slow advance of the northern flow lobe, and added lava filling in a crack just southwest of the vent. There were a few small earthquakes over the past day. Webcam and thermal and visual satellite images 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.

Unrest at Shishaldin Volcano continues. Storm-related noise is making seismic activity harder to detect currently, but small, low-frequency earthquakes were seen above the noise over the past day. Webcam views yesterday showed minor degassing at the volcano's summit. Nothing unusual was seen in satellite views.

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.