ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Thursday, July 7, 2022, 12:12 PM AKDT (Thursday, July 7, 2022, 20:12 UTC)
Low-level eruption of lava continues at Great Sitkin. Cloudy conditions obscured satellite views over the past day. Seisimicity remains low with a slight uptick compared to previous days. 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.
Pavlof Volcano continues to erupt from the vent on the east flank just below the volcano’s summit. Seismic tremor and elevated surface temperatures were observed over the last day and reflect the continued eruption of a small lava flow on the upper part of the volcano. Three small explosions were detected in seismic and infrasound data early this morning between 03:15 and 03:17 local (11:15 and 11:17 UTC).
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 was quiet over the past 24 hours with no explosions detected. Sulfur dioxide emissions were detected in satellite data. Steam emsssions from the active north crater of Mount Cerberus were observed in 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 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.
Unrest continues at Cleveland. Weakly elevated surface temperatures observed in otherwise cloudy satellite views over the past day. No significant infrasound activity was detected on local or regional networks.
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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Michelle Coombs, Scientist-in-Charge, USGS firstname.lastname@example.org (907) 786-7497
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