USGS Volcano Notice - DOI-USGS-AVO-2023-03-07T12:02:22-08:00

No significant seismicity was observed over the past day. Satellite images and web camera views were cloudy during the last 24 hours.

Great Sitkin Volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and regional infrasound and lightning networks.

Small earthquakes occured in the vicinity of Takawangha over the past day. Satellite views of the volcano were cloudy over the last 24 hours.

Takawangha volcano is monitored by local seismic and infrasound sensors, satellite data, and regional infrasound and lightning networks.

Small, shallow earthquakes continued to occur over the past day at Aniakchak volcano. No eruptive activity was observed in cloudy satellite images.

The current period of seismic unrest began in October 2022. Increases in seismic activity have been detected previously at other similar volcanoes, with no subsequent eruptions. We expect additional shallow seismicity and other signs of unrest, such as gas emissions, elevated surface temperatures, and surface deformation to precede any future eruption, if one were to occur. 

AVO monitors Aniakchak with a local network, which currently consists of two functional seismometers, as well as satellite remote sensing data and regional infrasound and lightning networks.

Small earthquakes in the vicinity of Trident Volcano continued to occur during the past 24 hours. No significant activity was seen in mostly clear web camera views and satellite imagery.

The current period of seismic unrest began on August 24, 2022. Increases in seismic activity have been detected previously at Trident Volcano and other similar volcanoes, with no subsequent eruptions. We expect additional shallow seismicity and other signs of unrest, such as gas emissions, elevated surface temperatures, and surface deformation to precede any future eruption, if one were to occur. 

AVO monitors Trident Volcano with a local network of seismometers, a webcam, remote sensing data, and regional infrasound and lightning networks.

No significant seismic activity was observed at Semiospochnoi volcano over the past day. Nothing significant was seen in cloudy satellite images views during the last 24 hours. A weak steam plume was seen in webcam views.

Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Young and ash clouds usually under 10,000 ft (3 km) above sea level have characterized the recent periods of activity. Additional ash-producing events could occur again with little warning. 

Semisopochnoi volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and regional infrasound and lightning networks.