Earthquake activity beneath Takawangha volcano and nearby Tanaga Volcano, which is about 8 km (5 miles) west of Takawangha volcano on Tanaga Island, continued over the past 24 hours. No activity was observed in satellite data. AVO continues to closely monitor the ongoing seismicity.

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

Earthquake activity beneath Takawangha volcano and nearby Tanaga Volcano, which is about 8 km (5 miles) west of Takawangha volcano on Tanaga Island, continued over the past 24 hours. No activity was observed in satellite data. AVO continues to closely monitor the ongoing seismicity.

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 is monitored with a local seismic and infrasound network, regional infrasound and lightning detection networks, and satellite data.

Lava probably continues to erupt at the summit of Great Sitkin Volcano, producing a thick lava flow that is currently confined to the summit crater. No significant local seismicity was observed during the last 24 hours—events recorded on the seismic network there were principally from the earthquake swarm at Tanaga Island. No activity was detected in cloudy satellite and web camera imagery.

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

Shallow, mostly small magnitude earthquakes continued to occur at a rate of a few per hour 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.

Occasional small, shallow earthquakes continued to occur in the vicinity of Trident Volcano during the past 24 hours. No activity was seen in cloudy 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.

Low-level ash emissions from the north crater of Mount Young at Semisopochnoi were observed in several web camera images over the past day. In addition, small explosions and volcanic tremor have resumed during the same time period. Ash emissions have not been detected in satellite data, although a vapor plume extending 150 km (90 miles) from Mount Young was observed yesterday in satellite data. This activity is similar to eruptive activity observed intermittently over the last few years at Semisopochnoi. The Aviation Color Code and Volcano Alert Level are being raised to ORANGE/WATCH.

Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Young and ash clouds usually under 3 km (10,000 ft) 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.