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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
Color Code ORANGE / Alert Level WATCHvolcano image
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Bogoslof
Color Code ORANGE / Alert Level WATCHvolcano 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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LAST ACTIVITY REPORT
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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Saturday, February 25, 2017, 11:45 AM AKST (Saturday, February 25, 2017, 20:45 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

The eruption of Bogoslof volcano continues. No significant volcanic activity has been detected in seismic, infrasound or satellite data over the past 24 hours.

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.


CLEVELAND VOLCANO (VNUM #311240)
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 satellite and clear web camera views of the volcano over the past day, and no significant volcanic activity has been detected in seismic or infrasound data.

Cleveland volcano is monitored with a limited real-time seismic network, which inhibits AVO's ability to detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning and satellite data.


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:

Dave Schneider, Acting Scientist-in-Charge, USGS
djschneider@usgs.gov (907) 786-7497

Jessica Larsen, Acting Coordinating Scientist, UAF
jflarsen@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
Contact Information: AVO Web Team

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