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U.S. Geological Survey
Saturday, January 21, 2017, 12:57 PM AKST (Saturday, January 21, 2017, 21:57 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

Volcanic unrest continues at Bogoslof volcano. No new ash emissions have been observed since the 13:17 AKST 20 January (22:17 UTC) eruption and seismicity remains low, so the color code was lowered to ORANGE.

Following a 30-minute long increase in seismicity, Bogoslof erupted yesterday afternoon producing a volcanic cloud that reached a pilot-reported height of 36,000 ft asl. Prevailing winds carried it to the southeast over the southwest end of Unalaska Island, but no ash fall was reported. A satellite image of the cloud indicates that it was ice-rich, and also suggests that hot material (possibly lava) was present at the surface near the vent minutes after the eruption was detected in seismic data. This eruption also produced a single lightning strike, and infrasound signals detected by sensors in Dillingham.

Bogoslof volcano is currently quiet, but given the pattern of eruptive activity over the past month the volcano likely remains in a restless and unpredictable condition and additional eruptive bursts accompanied by volcanic clouds could occur at any time.

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

55°25'2" N 161°53'37" W, Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Nothing significant was detected in seismic or pressure sensor data during the past 24 hours. Cloudy to partly cloudy satellite images of the volcano over the past day showed nothing noteworthy, and clouds obscured clear web camera views of the volcano.

The degree of unrest at Pavlof can change quickly. A return to eruptive activity can occur with with little or no warning.

52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Nothing of note has been observed in satellite views of Cleveland volcano over the past day. Clear views of the summit in local web camera images showed a low-level steam plume emanating from the summit crater. No significant activity was observed in seismic or pressure sensor data during the past 24 hours.


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

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.
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URL: avo.alaska.edu/activity/report.php
Page modified: December 2, 2016 10:12
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