ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Tuesday, June 7, 2022, 12:52 PM AKDT (Tuesday, June 7, 2022, 20:52 UTC)
Seismicity was low at Great Sitkin over the last day. Slightly elevated surface temperatures were observed in satellite images over the past day, which is consistent with continued low-level eruption of lava. 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 continued eruption of a small lava flow on the upper part of the volcano. No explosions or ash clouds 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 with minor ash emissions visible intermittently in web camera images over the past day during periods of clear weather. These small ash clouds rose hundreds of feet above the vent and quickly dispersed. Periods of seismic tremor continue to be observed.
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. Satellite images continue to show elevated surface temperatures in the summit crater. Recent subsidence in the summit crater was observed using a comparison of satellite radar images the were collected on 19 and 30 May (and only recently released). Subsidence in the summit crater is not unusual at this volcano. No significant seismic or infrasound activity was detected over the past day.
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
David Fee, Coordinating Scientist, UAFGI email@example.com (907) 322-4085
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