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ALASKA VOLCANO OBSERVATORY STATUS REPORT
U.S. Geological Survey
Friday, June 23, 2017, 10:13 PM AKDT (Saturday, June 24, 2017, 06:13 UTC)


BOGOSLOF VOLCANO (VNUM #311300)
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

OTHER ALASKA VOLCANOES

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

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

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CONTACT INFORMATION:

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.
VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.
AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].
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Page modified: February 17, 2017 10:11
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