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U.S. Geological Survey
Tuesday, January 31, 2017, 12:58 AM AKST (Tuesday, January 31, 2017, 09:58 UTC)

53°55'38" N 168°2'4" W, Summit Elevation 492 ft (150 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: RED

The eruption of Bogoslof volcano that began at 5:20 UTC on 31 January (20:20 AKST on 30 January) continues. Activity escalated between 8:40 to 9:30 UTC, as indicated by increased seismic tremor and high amplitude infrasound waves indicative of explosive activity. Numerous lightning strokes have been detected in the vicinity of Bogoslof from the resulting volcanic cloud. At 0900 UTC, a continuous volcanic plume extends for a distance of 125 miles towards the southeast over Unalaska Island at an altitude of about 20,000 to 25,000 ft. Activity continues to fluctuate and additional explosive events are likely.

The SIGMET warning message for aviation, issued by the National Weather Service Alaska Aviation Weather Unit currently is in effect up to 25,000 ft above sea level. Status of the ash cloud forecast can be found at their website at http://aawu.arh.noaa.gov/

The National Weather Service in has issued a Special Weather Statement for the possibility of a trace amount of ash fallout in Unalaska/Dutch Harbor tonight. See http://www.weather.gov/afc/ for details.

Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. Additional explosions producing high-altitude volcanic clouds could occur at any time. The Aviation Color Code remains at RED and the Alert Level remains at WARNING.


Information on all Alaska volcanoes is available at : http://www.avo.alaska.edu.

AVO scientists conduct daily checks of earthquake activity at all seismically-monitored volcanoes, examine web camera and satellite images for evidence of airborne ash and elevated surface temperatures, and consult other monitoring data as needed.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

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Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jfreymueller@alaska.edu (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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Page modified: December 2, 2016 10:12
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