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U.S. Geological Survey
Tuesday, June 27, 2017, 6:53 AM AKDT (Tuesday, June 27, 2017, 14:53 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

Explosive eruptive activity resumed at Bogoslof volcano early this morning with a roughly 14 minute long episode beginning at 11:17 UTC, June 27 (03:17 AKDT). The eruption produced a volcanic cloud that reached an altitude of 30,000 ft asl based on satellite data, prompting AVO to raise the Aviation Color Code to RED and Volcano Alert Level to WARNING. No infrasound was detected at networks from nearby islands, but the World Wide Lightning Location Network (WWLLN) detected lightning strokes associated with the resulting volcanic cloud. The volcanic cloud remains visible in satellite data moving northeast and is not expected to impact local communities or mainland Alaska.

Seismicity has since declined to background levels, but Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. This morning’s explosion occurred less than 12 hours after a similar explosion yesterday afternoon, and recent eruptive episodes have produced multiple short-duration explosions with pauses of minutes to hours. Additional explosions producing high-altitude volcanic clouds could occur at any time. The Aviation Color Code remains RED and Volcano Alert Level WARNING. AVO will continue to monitor seismic and infrasound data from nearby islands, as well as lightning data from the World Wide Lightning Location Network for signs of renewed activity.

The SIGMET warning message for aviation, issued by the National Weather Service Alaska Aviation Weather Unit currently is in effect up to 30,000 ft above sea level. Status of the ash cloud forecast can be found at their website at http://aawu.arh.noaa.gov/


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

Jeff Freymueller, Coordinating Scientist, UAF
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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