(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20170807/1834Z)
(3) Volcano:	Bogoslof (VNUM #311300)
(4) Current Color Code:	ORANGE
(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 of Bogoslof volcano began at about 18:00 UTC (10:00 AKDT) based on infrasound and seismic activity following more than an hour of increased seismicity. Satellite data from 18:00 UTC show an eruption cloud rising above the low cloud deck which is at an altitude of about 1500 ft. asl. There is no estimate of the eruption cloud height as of this time. As of yet there is no lightning activity that it typically observed during significant ash emissions. This suggests that the activity is currently at a low level and the Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH. AVO is evaluating all data sources and will update this report as more information becomes available.
(12) Volcanic cloud height:	Not determined yet
(13) Other volcanic cloud information:	Visible in satellite data from 18:00 UTC
(14) Remarks:	Status of any ash clouds can be found at the Alaska Aviation Weather Unit website at http://aawu.arh.noaa.gov/
(15) Contacts:	Michelle Coombs, Scientist-in-Charge, USGS mcoombs@usgs.gov (907) 786-7497 David Fee, Acting Coordinating Scientist, UAFGI dfee1@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, August 7, 2017, 10:34 AM AKDT
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 of Bogoslof volcano began at about 18:00 UTC (10:00 AKDT) based on infrasound and seismic activity following more than an hour of increased seismicity. Satellite data from 18:00 UTC show an eruption cloud rising above the low cloud deck which is at an altitude of about 1500 ft. asl. There is no estimate of the eruption cloud height as of this time. As of yet there is no lightning activity that it typically observed during significant ash emissions. This suggests that the activity is currently at a low level and the Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH.

AVO is evaluating all data sources and will update this report as more information becomes available.

Recent Observations:
[Volcanic cloud height] Not determined yet
[Other volcanic cloud information] Visible in satellite data from 18:00 UTC

Remarks: Status of any ash clouds can be found at the Alaska Aviation Weather Unit website at http://aawu.arh.noaa.gov/

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

David Fee, Acting Coordinating Scientist, UAFGI
dfee1@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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