ALASKA VOLCANO OBSERVATORY STATUS REPORT
U.S. Geological Survey
Friday, January 20, 2017, 3:39 PM AKST (Saturday, January 21, 2017, 00:39 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

Following an approximately 30-minute-long increase in seismic activity, Bogoslof erupted this afternoon starting at 13:17 AKST (22:17 UTC). Pilots reported the cloud reached a height of 36,000 ft asl., and prevailing winds carried it to the southeast over the southwest end of Unalaska Island. A satellite image from 13:25 (22:25 UTC) indicates an ice-rich cloud, and the presence of very hot material (possibly lava) at the surface near the vent. This eruption also produced a single lightning strike, and infrasound signals detected by sensors in Dillingham.

The Aviation Color Code remains at RED and the Alert Level remains at 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.

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/

FOLLOW AVO ON FACEBOOK: https://facebook.com/alaska.avo

FOLLOW AVO ON TWITTER: https://twitter.com/alaska.avo

CONTACT INFORMATION:

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

Jeff Freymueller, Coordinating Scientist, UAFGI
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.

---