ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Sunday, May 29, 2022, 11:48 AM AKDT (Sunday, May 29, 2022, 19:48 UTC)
Eruption of lava continues with elevated surface temperatures and expansion of the lava flow field observed in partly cloudy satellite data. No significant seismic activity was detected over the past day. It is possible that new explosive activity could occur with little or no warning.
Great Sitkin is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.
Low-level eruption continues from the active vent on the upper eastern flank. Active lava flows extending up to 650 meters (~2100 ft) from the vent were observed in satellite images. Seismic tremor continues but no explosions or ash emissions were detected.
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 can change quickly and the progression to more significant eruptive activity can occur with little or no warning.
Pavlof is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.
Low-level eruptive activity continues. Seismicity remains elevated with intermittent tremor and several explosions were detected in seismic data over the past day. Satellite and web camera views were mostly obscured by clouds, but low-level ash emissions associated with these explosions likely continue. Elevated surface temperatures were observed in the active north crater of Mount Cerberus overnight and sulfur dioxide emissions were detected in satellite imagery.
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 may continue and could be difficult to detect, especially when thick cloud cover obscures the volcano.
Semisopochnoi is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.
Elevated surface temperatures and a steam and sulfur dioxide gas plume were observed in satellite data over the past day. No significant seismic or infrasound activity was detected.
Episodes of lava effusion and explosions can occur without advance warning. Explosions from 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 operational, Cleveland volcano 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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Kristi Wallace, Acting Scientist-in-Charge, USGS firstname.lastname@example.org (907) 786-7497
David Fee, Coordinating Scientist, UAFGI email@example.com (907) 322-4085
The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.
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