USGS Volcano Notice - DOI-USGS-AVO-2023-04-27T10:46:15-08:00

Lava continues to erupt at the summit of Great Sitkin Volcano, producing a thick lava flow within the summit crater. Nothing signifiant was seen in cloudy satellite images over the past day. Webcam views were also obscured by clouds. Seismic activity was low.

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

Seismicity at Semisopochnoi volcano was at low levels over the past 24 hours. No evidence for explosive activity detected in infrasound data. Nothing significant observed in mostly cloudy satellite views of the volcano. A few partly clear web camera views of the north cone on Mount Young showed minor steaming.

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, webcams, and regional infrasound and lightning networks.

Earthquake activity beneath Aniakchak volcano continued over the past 24 hours. No eruptive activity was observed in cloudy satellite and web camera views of the volcano.

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 three functional seismometers, as well as satellite remote sensing data and regional infrasound and lightning networks.

Elevated earthquake activity beneath Takawangha volcano and nearby Tanaga Volcano continued over the past 24 hours. No eruptive activity was observed in mostly cloudy satellite images.

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

Takawangha volcano and Tanaga Volcano are monitored with a local seismic and infrasound network, regional infrasound and lightning detection networks, and satellite data. Tanaga Volcano is about 5 miles (8 km) west of Takawangha volcano on Tanaga Island.

Earthquake activity continued in the vicinity of Trident Volcano over the last 24 hours at a rate above background levels. No volcanic activity was observed in cloudy satellite and web camera data.

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.

Elevated earthquake activity beneath Tanaga Volcano and nearby Takawangha volcano continued over the past 24 hours. No eruptive activity was observed in mostly cloudy satellite images.

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

Tanaga Volcano and Takawangha volcano are monitored with a local seismic and infrasound network, regional infrasound and lightning detection networks, and satellite data. Takawangha volcano is about 5 miles (8 km) east of Tanaga Volcano on Tanaga Island.