USGS Volcano Notice - DOI-USGS-AVO-2024-03-04T21:50:07+00:00

Slow eruption of lava in the summit crater of Great Sitkin Volcano likely continues. Seismicity was low over the past day. Satellite and web camera observations were partly obscured by clouds over the past day. No activity was observed.

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.

Seismicity remains slightly elevated with small low frequency earthquakes observed. These earthquakes are not uncommon at Gareloi. Satellite and web camera observations were mostly obscured by clouds over the past day. No activity was observed.

Mount Gareloi persistently emits magmatic gases from a fumarole field on the south crater and commonly exhibits low-level seismic activity. The current increase in seismicity likely reflects a change to the magmatic-hydrothermal system, but it is not clear that the likelihood of a volcanic eruption has increased. AVO will continue to monitor activity to determine if the recent changes are related to influx of new magma or other changes to the magmatic system.

Mount Gareloi is monitored by a local seismic and infrasound network, satellite data, and regional infrasound and lightning-detection networks.

Low-level unrest continues at Shishaldin Volcano. Seismicity has been quiet in the past day. No unusual activity observed in satellite and web camera views over the past day.

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.