(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20170127/0250Z)
(3) Volcano:	Bogoslof (VNUM #311300)
(4) Current Color Code:	ORANGE
(5) Previous Color Code:	RED
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:	2017/A44
(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:	No further ash emissions have occurred at Bogoslof Volcano since the explosion that began today at 06:50 AKST (15:50 UTC). The volcanic ash cloud from that explosion has dissipated and the SIGMET warning for aviation (issued by the National Weather Service) was cancelled today at 13:36 AKST (22:36 UTC). No detectable activity observed in seismic, infrasound or lightning data. We are therefore lowering the Aviation Color Code to ORANGE and the Alert Level to WATCH. Additional ash-producing eruptions could occur at any time, however, with no detectable precursors.
(12) Volcanic cloud height:	none observed
(13) Other volcanic cloud information:	n/a
(14) Remarks:
(15) Contacts:	Michelle Coombs, Scientist-in-Charge, USGS mcoombs@usgs.gov (907) 786-7497 Jessica Larsen, Acting Coordinating Scientist, UAF jflarsen@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
Previous Volcano Alert Level: WARNING

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

Issued: Thursday, January 26, 2017, 5:50 PM AKST
Source: Alaska Volcano Observatory
Notice Number: 2017/A44
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary: No further ash emissions have occurred at Bogoslof Volcano since the explosion that began today at 06:50 AKST (15:50 UTC). The volcanic ash cloud from that explosion has dissipated and the SIGMET warning for aviation (issued by the National Weather Service) was cancelled today at 13:36 AKST (22:36 UTC). No detectable activity observed in seismic, infrasound or lightning data. We are therefore lowering the Aviation Color Code to ORANGE and the Alert Level to WATCH. Additional ash-producing eruptions could occur at any time, however, with no detectable precursors.



Recent Observations:
[Volcanic cloud height] none observed
[Other volcanic cloud information] n/a

Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@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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