ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Thursday, November 3, 2022, 12:20 PM AKDT (Thursday, November 3, 2022, 20:20 UTC)
Low-level eruptive activity continues from a vent on the east flank of Pavlof Volcano, just below the summit. Seismic tremor and small explosions were detected in geophysical data over the past day. Web camera and satellite views of the vent region were mostly obscured by clouds throughout the day, but a clear view this morning showed minor steaming from the active vent.
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 continues to erupt in the summit crater of Great Sitkin Volcano. Seismicity was low and advance of the active lava flow was observed in satellite imagery over the past day.
Great Sitkin Volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and regional infrasound and lightning networks.
Unrest at Semisopochnoi volcano continues. Small earthquakes and tremor were detected over the past day. No unusual activity was observed in cloudy satellite views and low-level steaming from the north crater of Mount Cerberus was observed in mostly clear web camera views.
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.
No significant seismic activity was detected over the past day. No activity was observed in cloudy satellite views.
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 two 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.
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, email@example.com, (907) 786-7497
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