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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Tuesday, March 9, 2021, 11:37 AM AKST (Tuesday, March 9, 2021, 20:37 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. Satellite and web camera views of the volcano were obscured by clouds over the past 24 hours. Moderately elevated surface temperatures observed in some cloudy satellite views suggest that low-level eruptive activity is continuing and a small steam-rich plume extending ~10 km (~6.2 miles) to the northeast at ~15,000 ft asl was observed overnight. The meteorological cloud layer is mostly between 10,000 and 20,000 ft. No explosions were detected in regional geophysical data. No new ash deposits have been observed over the past 24 hours. 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
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.