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U.S. Geological Survey
Tuesday, January 31, 2017, 7:25 AM AKST (Tuesday, January 31, 2017, 16:25 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 strong explosive activity of Bogoslof volcano that began at 5:20 UTC on 31 January (20:20 AKST on 30 January) has greatly subsided or ended. Seismic activity, infrasound signals, and lightning related to strong ash emissions are no longer being detected. No additional signs of ash emissions have been observed in satellite data although a drifting ash cloud is still observed SE of Unalaska/Dutch Harbor at an altitude of 25,000 feet above sea level. Trace amounts of ashfall and a sulfur smell have been reported in Unalaska/Dutch Harbor, 61 mi (98 km) from Bogoslof .

The SIGMET warning message for aviation, issued by the National Weather Service Alaska Aviation Weather Unit is currently 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/

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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