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U.S. Geological Survey
Friday, June 23, 2017, 10:13 PM AKDT (Saturday, June 24, 2017, 06:13 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 late this afternoon with a roughly 10 minute long episode beginning at 00:49 UTC, June 24 (16:49 AKDT, June 23). This event produced a volcanic cloud that reached 36,000 ft asl and moved east, passing over Akutan and the North Pacific Ocean before it was no longer apparent in satellite data. AVO has received no reports of ash fall. This initial event also generated infrasound that was detected by networks on Umnak and Adak Islands. The volcanic cloud also generated several lightning strokes.

The event at 00:49 UTC was followed by four additional eruptive bursts at 3:18-3:24 UTC, 4:13-4:21 UTC, 5:04-5:12 and 5:52-5:55 UTC. High clouds have moved into the region since the initial explosion and has obscured observations of ash clouds from these later events. The meteorological cloud deck top is at about 28,000 to 30,000 ft asl, and none of the explosive events has produced a cloud that have risen above it. These explosions were also detected in infrasound data, but no lightning strokes were detected by the World Wide Lightning Location Network (WWLLN).

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.

Status of the ash cloud forecast can be found at the National Weather Service Alaska Aviation Weather Unit website at http://www.weather.gov/aawu/sigmets


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Dave Schneider, Acting Scientist-in-Charge, USGS
djschneider@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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Page modified: December 2, 2016 10:12
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