(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20170131/0617Z)
(3) Volcano:	Bogoslof (VNUM #311300)
(4) Current Color Code:	ORANGE
(5) Previous Color Code:	ORANGE
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:	2017/A81
(8) Volcano Location:	N 53 deg 55 min W 168 deg 2 min
(9) Area:	Aleutians
(10) Summit Elevation:	492 ft (150 m)
(11) Volcanic Activity Summary:	Several short bursts of activity have been detected in seismic data beginning at 5:20 and at 6:08 UTC. An infrasound signal accompanied the first event indicating an explosive emission from Bogoslof. An eruption cloud has been observed in satellite data at 5:30 UTC to an altitude of 20,000 ft above sea level by the National Weather Service. We are evaluating the cloud height as new data comes in and will update if needed. The Aviation Color Code remains at ORANGE and the Volcano Alert Level at WATCH.
(12) Volcanic cloud height:	20,000
(13) Other volcanic cloud information:	initial estimate
(14) Remarks:	Please reference the National Weather Service Alaska Aviation Weather Unit for current information on the volcanic cloud movement. http://aawu.arh.noaa.gov/
(15) Contacts:	Michelle Coombs, Scientist-in-Charge, USGS mcoombs@usgs.gov (907) 786-7497 Jeff Freymueller, Coordinating Scientist, UAFGI jfreymueller@alaska.edu (907) 322-4085
(16) Next Notice:

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AVO/USGS Volcanic Activity Notice

Volcano: Bogoslof (VNUM #311300)

Current Volcano Alert Level: WATCH

Current Aviation Color Code: ORANGE

Issued: Monday, January 30, 2017, 9:17 PM AKST
Source: Alaska Volcano Observatory
Notice Number: 2017/A81
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary: Several short bursts of activity have been detected in seismic data beginning at 5:20 and at 6:08 UTC. An infrasound signal accompanied the first event indicating an explosive emission from Bogoslof. An eruption cloud has been observed in satellite data at 5:30 UTC to an altitude of 20,000 ft above sea level by the National Weather Service. We are evaluating the cloud height as new data comes in and will update if needed.

The Aviation Color Code remains at ORANGE and the Volcano Alert Level at WATCH.



Recent Observations:
[Volcanic cloud height] 20,000
[Other volcanic cloud information] initial estimate

Remarks: Please reference the National Weather Service Alaska Aviation Weather Unit for current information on the volcanic cloud movement. http://aawu.arh.noaa.gov/

Contacts: 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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