ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Wednesday, March 8, 2023, 11:29 AM AKST (Wednesday, March 8, 2023, 20:29 UTC)
Weak seismicity was observed over the past day at Great Sitkin Volcano. 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.
Earthquake activity beneath Tanaga Volcano began to increase starting at about 1:30 PM AKST yesterday (March 7). At roughly 8:45 PM AKST last night, the activity escalated with earthquakes occurring as often as 2 or 3 each minute. Initial locations of these earthquakes place them beneath the summit of Tanaga Volcano and to the west, beneath Sajaka volcano. The largest of these earthquakes have magnitudes between 2 and 3. Seismic activity slowed overnight before picking up again this morning, with several dozen events occurring per hour. In response to this seismicity, the Alaska Volcano Observatory raised the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY.
Tanaga Volcano is monitored with a local seismic and infrasound network, regional infrasound and lightning detection networks, and satellite data.
Small earthquakes continued to occur in the vicinity of Takawangha volcano over the past day. Satellite views of the volcano were partly 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 at a rate of several 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.
Small earthquakes in the vicinity of Trident Volcano continued to occur during the past 24 hours. No activity was seen in mostly clear webcam 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.
Weak seismic activity was observed at Semiospochnoi volcano over the past day. A steam plume from the north cone of Mount Young was seen in relatively clear webcam and satellite 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.
OTHER ALASKA VOLCANOES
Information on all Alaska volcanoes is available at: http://www.avo.alaska.edu.
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Michelle Coombs, Scientist-in-Charge, USGS firstname.lastname@example.org (907) 786-7497
David Fee, Coordinating Scientist, UAFGI email@example.com (907) 378-5460
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