ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Thursday, December 8, 2022, 12:19 PM AKST (Thursday, December 8, 2022, 21:19 UTC)
No eruptive explosions or lava flow activity was detected in seismic, infrasound, satellite, or webcam data over the last day, however, cloudy conditions could have obscured observation of some low-level eruptive events. Seismic tremor and a few low frequency earthquakes were recorded throughout the past 24 hours.
Small explosions associated with the current eruption could happen at any time and may be accompanied by small ash plumes within the immediate vicinity of the volcano. The level of unrest at Pavlof Volcano can change quickly and the progression to more significant eruptive activity can occur with little or no warning.
Pavlof Volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and regional infrasound and lightning networks.
Lava most likely continued to erupt in the summit crater of Great Sitkin Volcano over the last day, however, satellite and webcam observations were obscured by clouds. Seismicity remains low with only one local earthquake recorded in the last day.
Great Sitkin Volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and regional infrasound and lightning networks.
Unrest probably continues at the north crater of Mount Cerberus, but clouds obscured satellite and webcam images over the last day. No significant seismic activity was detected.
Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Cerberus and ash clouds usually under 10,000 ft (3 km) above sea level have characterized the recent activity. Small explosions and associated ash emissions could resume and may be difficult to detect during periods of high winds and/or when thick cloud cover obscures the volcano. Ash emissions over the past several years of activity have typically reached altitudes of less than 10,000 ft (3 km) above mean sea level.
Semisopochnoi volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and regional infrasound and lightning networks.
Clear webcam images showed a robust steam and gas plume from the Cleveland summit this morning and a single local earthquake was detetected from seismic stations installed on Mount Cleveland.
Episodes of lava effusion and explosions can occur without advance warning. Explosions from Mount Cleveland are normally short-duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible but are less likely and occur less frequently.
When the seismic network is operational, Mount Cleveland is monitored by only three local seismic stations, which restricts AVO's ability to precisely locate earthquakes and detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning, and satellite data.
The ongoing earthquake swarm near Takawangha volcano is continuing with several earthquakes observed during the past 24 hours. The earthquakes are generally shallow, having preliminary depths of about 2 to 7 miles (3 to 11 km) below sea level. This activity may be due to the movement of magma beneath the volcano. Clouds obscured satellite images over the last day.
OTHER ALASKA VOLCANOES
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Michelle Coombs, Scientist-in-Charge, USGS, email@example.com, (907) 786-7497
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