ALASKA VOLCANO OBSERVATORY STATUS REPORT
U.S. Geological Survey
Saturday, January 14, 2017, 11:56 PM AKST (Sunday, January 15, 2017, 08:56 UTC)

BOGOSLOF VOLCANO (VNUM #311300)
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 detected an explosive eruption from Bogoslof volcano tonight at about 22:16 AKST (07:16 15 January UTC). The eruption was preceded by about 50 minutes of seismic activity, and was recorded by several strong pulses of seismicity from 22:16 to 22:40 AKST (07:16 to 07:40 15 January UTC), a single lightning stroke at 22:32 AKST (07:32 15 January UTC), and by the infrasound arrays at Okmok volcano (Umnak Island) and in Dillingham.

After about 20 minutes of quiet, two more seismic bursts started at 23:02 AKST (08:02 15 January UTC) and 23:18 AKST (08:18 15 January UTC), and lasted about nine and two minutes, respectively. These signals were not accompanied by infrasound or lightning. Since then, seismic levels have returned to lower levels.

Satellite images show no obvious volcanic cloud from tonight's activity, though low-level meteorological clouds (about 10,000 ft asl) may be obscuring a very low volcanic cloud.

The Aviation Color Code remains at ORANGE and the Alert Level remains at WATCH.

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.

OTHER ALASKA VOLCANOES

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

FOR MORE INFORMATION ON ALASKA VOLCANOES: http://www.avo.alaska.edu

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

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CONTACT INFORMATION:

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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