ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Sunday, November 6, 2022, 1:21 PM AKST (Sunday, November 6, 2022, 22:21 UTC)
Low-level eruptive activity continues from a vent on the east flank of Pavlof Volcano, just below the summit. Volcanic tremor was observed in seismic data during the last 24 hours. Moderately elevated surface temperatures at the active vent were seen in several satellite images over the past day. Nothing of note observed in available web camera views.
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 weakly elevated surface temperatures were observed in satellite imagery over the past day, indicating the advance of the active lava flow.
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. Volcanic tremor was observed on the local seismic stations for several hours over the past day. Nothing significant was reported in cloudy satellite images or web camera views during the last 24 hours.
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 local seismic activity was detected over the past day. Nothing significant was observed during the last 24 hours in clear to cloudy satellite views of 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.
OTHER ALASKA VOLCANOES
Information on all Alaska volcanoes is available at: http://www.avo.alaska.edu.
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Kristi Wallace, Acting Scientist-in-Charge, USGS, email@example.com, (907) 786-7497
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