(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20161222/0232Z)
(3) Volcano:	Bogoslof (VNUM #311300)
(4) Current Color Code:	RED
(5) Previous Color Code:	ORANGE
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:
(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:	An explosive eruption started at about 01:10 UTC 12/22 (16:10 AKST today) as seen in satellite and seismic data from neighboring islands and appeared to last for about 30 minutes. Cloud-top temperatures and wind direction suggest the cloud is as high as 35,000 ft asl, and is moving to the north. On the basis of this information, the Aviation Color Code is raised to RED and the Alert Level to WARNING. AVO has no ground-based volcano monitoring equipment on Bogoslof volcano and is unable to provide a forecast of future eruptive activity. We will monitor satellite images and data from distant seismic and infrasound instruments for indications of significant explosive activity.
(12) Volcanic cloud height:	35,000 ft asl
(13) Other volcanic cloud information:	Drifting north
(14) Remarks:
(15) Contacts:	Michelle Coombs, Scientist-in-Charge, USGS mcoombs@usgs.gov (907) 786-7497 Janet Schaefer, Acting Coordinating Scientist, DGGS janet.schaefer@alaska.gov (907) 322-4085
(16) Next Notice:

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AVO/USGS Volcanic Activity Notice

Volcano: Bogoslof (VNUM #311300)

Current Volcano Alert Level: WARNING
Previous Volcano Alert Level: WATCH

Current Aviation Color Code: RED
Previous Aviation Color Code: ORANGE

Issued: Wednesday, December 21, 2016, 5:32 PM AKST
Source: Alaska Volcano Observatory
Notice Number:
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary: An explosive eruption started at about 01:10 UTC 12/22 (16:10 AKST today) as seen in satellite and seismic data from neighboring islands and appeared to last for about 30 minutes. Cloud-top temperatures and wind direction suggest the cloud is as high as 35,000 ft asl, and is moving to the north. On the basis of this information, the Aviation Color Code is raised to RED and the Alert Level to WARNING.

AVO has no ground-based volcano monitoring equipment on Bogoslof volcano and is unable to provide a forecast of future eruptive activity. We will monitor satellite images and data from distant seismic and infrasound instruments for indications of significant explosive activity.

Recent Observations:
[Volcanic cloud height] 35,000 ft asl
[Other volcanic cloud information] Drifting north

Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Janet Schaefer, Acting Coordinating Scientist, DGGS
janet.schaefer@alaska.gov (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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