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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).
Color Code ORANGE / Alert Level WATCHvolcano image
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Color Code RED / Alert Level WARNINGvolcano image
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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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Get these reports emailed to you: USGS VNS

U.S. Geological Survey
Saturday, February 18, 2017, 12:55 PM AKST (Saturday, February 18, 2017, 21:55 UTC)

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

The eruption of Bogoslof volcano continues. After the explosion the morning of 17 February, a subsequent minor explosion was observed in seismic and infrasound data at around 15:46 AKST (00:46 UTC). The resulting volcanic cloud was observed in satellite views with cloud tops at around 25,000 ft asl.

The morning of 18 February, at around 4:50 AKST (13:50 UTC), an explosion occurred producing a cloud again. The explosion was detected by seismic, infrasound, lightning and satellite observations. This volcanic cloud traveled south-west at around 25,000 ft asl.

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. Some previous explosions have been preceded by an increase in earthquake activity that allowed for short-term forecasts of imminent significant explosive activity. Although we are able to detect energetic explosive activity in real-time, there is typically a lag of tens of minutes until we can characterize the magnitude of the event and the altitude of the volcanic cloud. 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. When such low-level activity occurs, it is considered to be consistent with Aviation Color Code ORANGE and Volcano Alert Level WATCH.

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.

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

No significant activity was observed in mostly cloudy views of the volcano by satellite and web camera over the past day. No significant volcanic activity has been detected in seismic or infrasound data over the past 24 hours. The presence of the recently emplaced lava dome within the summit crater may act to block the vent, resulting in reduced or restricted gas emissions which may lead to explosive activity with little to no warning.

Cleveland volcano is not monitored with a real-time seismic network and this inhibits AVO's ability to detect unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of satellite, infrasound, lightning data and local observations. AVO is monitoring the unrest at Cleveland volcano as closely as possible and will release additional information if or when it becomes available.


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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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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Page modified: February 15, 2017 17:28
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