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U.S. Geological Survey
Saturday, June 24, 2017, 9:23 AM AKDT (Saturday, June 24, 2017, 17:23 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

A series of as many as six explosive eruptive events occurred at Bogoslof between 16:49 AKDT, June 23 (00:49 UTC, June 24) and 00:44 AKDT, June 24 (8:44 UTC). Since 0:44 AKDT (8:44 UTC) today, seismicity, as detected by AVO networks on nearby Umnak and Makushin Islands, has been quiet. No infrasound signals have been detected since 00:44 AKDT (8:44 UTC) today, and satellite images after 00:44 AKDT show no evidence for additional volcanic emissions from the volcano. AVO has received no reports of ash fallout on local communities associated with this recent eruptive period.

The 00:49 UTC, June 24 (16:49 AKDT, June 23) event produced a volcanic cloud that reached 36,000 ft above sea level (asl) and moved east, passing over Akutan and the North Pacific Ocean before it was no longer apparent in satellite data. The volcanic cloud also generated several lightning strokes. The 00:49 UTC event produced infrasound that was detected by networks on Umnak and Adak Islands. The eruptive bursts at 3:18-3:24 UTC, 4:13-4:21 UTC, 5:04-5:12 UTC, 5:52-5:55 UTC, and 8:40-8:44 UTC also produced strong seismicity and infrasound. Volcanic clouds likely containing ash were generated by these events, but meteorological clouds as high as 28,000 to 30,000 ft asl in the region obscured observations of the associated ash clouds and the extent and content of these emissions could not be conclusively assessed. As of this morning, ash clouds can no longer be detected in satellite data.

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. Low-level explosive activity that is below our ability to detect in our data sources may be occurring. These low-level explosions could pose a hazard in the immediate vicinity of the volcano.

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://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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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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