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The Alaska Volcano Observatory (AVO) is a joint program of the United States Geological Survey (USGS), the Geophysical Institute of the University of Alaska Fairbanks (UAFGI), and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS).
RESTLESS VOLCANOES
Cleveland
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Bogoslof
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Thank you Unalaska!
Posted: February 01, 2017

Ashfall on vehicle in Unalaska
The Alaska Volcano Observatory (AVO) would like to thank the community of Unalaska for their keen observations, photos, and samples of volcanic ash from the Bogoslof eruption. Your observations and collections are very important to us and we will use them to improve our understanding of Bogoslof volcano and this current eruption.

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Bogoslof Summary of Current Activity
Posted: January 31, 2017
Summary of current activity, as of January 31, 2017

Bogoslof shoreline change, 31 Jan 2017
Bogoslof volcano is in an active eruption sequence that began on December 12, 2016. Until recently, eruptive activity detected by remote monitoring instruments, in satellite data, and from pilot reports had been dominated by a series of short-duration (minutes to tens of minutes) explosive events. There were about 27 such events, occurring every 1 to 4 days. The resulting volcanic clouds rose to altitudes of 20,000 to 35,000 ft above sea level, and were typically discernible in satellite images for hours afterwards. Most of the clouds were ice-rich, due to the influx of seawater into the eruption column, but likely contained volcanic ash as well. Sulfur dioxide (SO2) gas clouds from some of these events were detected in satellite data, and the cloud from the December 21 event was tracked by satellite for five days to a location over the central United States (Nebraska).

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LAST ACTIVITY REPORT
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ALASKA VOLCANO OBSERVATORY STATUS REPORT
U.S. Geological Survey
Sunday, February 19, 2017, 8:48 PM AKST (Monday, February 20, 2017, 05:48 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 the series of short, explosive eruptions that started at 17:08 AKST this afternoon (02:08 February 20 UTC) and lasted until 17:45 AKST (02:45 February 20 UTC), seismicity and infrasound as detected on neighboring islands has been quiet.

Satellite images following the activity showed a volcanic plume extending about 100 miles (160 km) to the southeast over Unalaska Island and the Pacific Ocean. The plume was visible in images through 19:00 AKST (04:00 February 20 UTC). AVO geologists on Unalaska Island described the cloud has having a white upper portion and a slightly darker lower portion.

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. Low-level explosive activity that is below our ability to detect in our data sources may be occurring. These low-level explosions could pose a hazard in the immediate vicinity of the volcano.

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://aawu.arh.noaa.gov/

OTHER ALASKA VOLCANOES

Information on all Alaska volcanoes is available at : http://www.avo.alaska.edu.

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

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

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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RUSSIAN VOLCANO INFORMATION

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Page modified: February 15, 2017 17:28
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