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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Monday, March 8, 2021, 12:37 PM AKST (Monday, March 8, 2021, 21:37 UTC)
56°11'52" N 159°23'35" W,
Summit Elevation 8225 ft (2507 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Low-level eruptive activity likely continues at Veniaminof. Clear satellite imagery of the eruption yesterday showed ash emissions from the small cone in the summit caldera, in addition to the probable eruption of lava from a vent ~1 km (0.6 miles) east of the cone summit on the cone flank under the intracaldera glacier. This activity is producing incandescence and strongly elevated surface temperatures, as well as a small steam plume and meltwater. A low-level plume of volcanic ash and gas likely continues and was observed by pilots, and in web camera and satellite images during periods of clear weather over the past day. The ash and gas plume was below 10,000 ft asl yesterday and has not been observed in cloudy conditions overnight or this morning. The plume extended up to 150 km (93 miles) to the northeast yesterday afternoon, but ashfall is mostly confined to the summit caldera near the vent. No ashfall has been reported in nearby communities and updated guidance on modeled ash fall can be found at: https://www.avo.alaska.edu/activity/ash3d/ashfall.php?vid=ak301
Eruptive activity at Veniaminof usually consists of minor ash emissions, lava fountaining and lava flows from the small cone in the summit caldera. Ash emissions are typically confined to the summit crater, but larger events can result in ash fall in nearby communities and drifting airborne ash.
The local seismic data remains offline due to an outage of a satellite link at Port Heiden. However, the Alaska Volcano Observatory continues to monitor Veniaminof with satellite data and remote infrasound, seismic and lightning networks.
51°55'44" N 179°35'52" E,
Summit Elevation 2625 ft (800 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
No volcanic activity was observed at Semisopochnoi over the past day in mostly cloudy satellite views. No activity was detected in regional infrasound data.
Semisopochnoi is monitored by satellite data, regional infrasound, and lightning detection instruments. An infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a slight delay (approximately 13 minutes) if atmospheric conditions permit.
OTHER ALASKA VOLCANOES
Information on all Alaska volcanoes is available at : http://www.avo.alaska.edu.
For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php
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Dave Schneider, Acting Scientist-in-Charge, USGS
email@example.com (907) 786-7497
David Fee, Coordinating Scientist, UAFGI
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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.