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U.S. Geological Survey
Thursday, January 12, 2017, 3:08 PM AKST (Friday, January 13, 2017, 00:08 UTC)

53°55'38" N 168°2'4" W, Summit Elevation 492 ft (150 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

AVO has detected two short-lived, seismically energetic eruptions from Bogoslof volcano today at 11:23 AKST (20:23 UTC) and at 12:30 AKST (21:30 UTC). The estimated duration for each of the these events is 5 to 6 minutes based on seismicity. Both events were observed by pilots. The estimated height of the cloud from the first eruption was 18,000 feet asl. The estimated height of the cloud from the second eruption was 14,500 feet asl. The first event was not seen in satellite data but a small cloud was observed following the second event which confirmed an altitude of about 14,500 feet asl. Due to the short duration of these eruptions and the relatively low altitude of the resultant eruption clouds, the Aviation Color Code remains at ORANGE and the Alert Level remains at WATCH

Additional explosive events at Bogoslof may occur without warning. Due to the unpredictability of the situation, the Aviation Color Code remains RED and the Volcano Alert Level WARNING.

AVO has no ground-based volcano monitoring equipment on Bogoslof volcano. We continue to monitor satellite images, data from distant seismic and infrasound instruments, and information from the Worldwide Lightning Location Network for indications of significant activity.

Status of the ash cloud can be found at the Alaska Aviation Weather Unit website at http://aawu.arh.noaa.gov/


Other Alaska volcanoes show no signs of significant unrest: http://www.avo.alaska.edu/activity/

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


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

Janet Schaefer, Acting Coordinating Scientist, DGGS
janet.schaefer@alaska.gov (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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URL: avo.alaska.edu/activity/report.php
Page modified: December 2, 2016 10:12
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