(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20170710/1610Z)
(3) Volcano:	Bogoslof (VNUM #311300)
(4) Current Color Code:	ORANGE
(5) Previous Color Code:	RED
(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:	No further ash emissions have occurred at Bogoslof Volcano since the series of explosions that began on Sunday, 09 July at 23:47 AKDT (07:47 UTC July 10) and ended about 02:35 AKDT (10:35 UTC) July 10. A small eruption cloud associated with the first two eruptive pulses was evident in satellite data. This cloud may have reached as high as 20,000 ft. above sea level and was carried to the southeast but dissipated rapidly. No additional volcanic clouds were observed in satellite data. The activity also was detected in seismic and infrasound data. After about 03:00 AKDT (11:00 UTC) seismicity declined and has remained at low levels. We are therefore lowering the Aviation Color Code to ORANGE and the Alert Level to WATCH. Given the ongoing episodic nature of eruptive activity at Bogoslof, additional ash-producing eruptions could occur at any time.
(12) Volcanic cloud height:	Not applicable
(13) Other volcanic cloud information:	Not applicable
(14) Remarks:
(15) Contacts:	Chris Waythomas, Acting Scientist-in-Charge, USGS chris@usgs.gov (907) 786-7497 Pavel Izbekov, Acting Coordinating Scientist, UAF GIpavel@gi.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: Monday, July 10, 2017, 8:10 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: No further ash emissions have occurred at Bogoslof Volcano since the series of explosions that began on Sunday, 09 July at 23:47 AKDT (07:47 UTC July 10) and ended about 02:35 AKDT (10:35 UTC) July 10. A small eruption cloud associated with the first two eruptive pulses was evident in satellite data. This cloud may have reached as high as 20,000 ft. above sea level and was carried to the southeast but dissipated rapidly. No additional volcanic clouds were observed in satellite data. The activity also was detected in seismic and infrasound data. After about 03:00 AKDT (11:00 UTC) seismicity declined and has remained at low levels. We are therefore lowering the Aviation Color Code to ORANGE and the Alert Level to WATCH. Given the ongoing episodic nature of eruptive activity at Bogoslof, additional ash-producing eruptions could occur at any time.

Recent Observations:
[Volcanic cloud height] Not applicable
[Other volcanic cloud information] Not applicable

Contacts: Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov (907) 786-7497

Pavel Izbekov, Acting Coordinating Scientist, UAF
GIpavel@gi.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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