(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20170124/1846Z)
(3) Volcano:	Takawangha (VNUM #311090)
(4) Current Color Code:	YELLOW
(5) Previous Color Code:
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:	2017/A71
(8) Volcano Location:	N 51 deg 52 min W 178 deg 1 min
(9) Area:	Aleutians
(10) Summit Elevation:	4754 ft (1449 m)
(11) Volcanic Activity Summary:	An energetic earthquake swarm on Tanaga Island started yesterday, January 23, and is continuing. The earthquakes locate 6 to 7 km ESE of Takawangha Volcano. This activity may be due to brittle failure in the surrounding rock caused by magma movement. AVO is therefore raising the Aviation Color Code to Yellow and Alert Level to Advisory for Takawangha Volcano. No eruptive activity has been detected in satellite data.
(12) Volcanic cloud height:	Not applicable
(13) Other volcanic cloud information:	Not applicable
(14) Remarks:	Takawangha is a remote, 1,449 m (4,754 ft)-high stratovolcano located on the northeast portion of Tanaga Island, roughly 95 km (59 miles) west of Adak in the Andreanof Islands. Takawangha's summit is mostly ice-covered, except for four young craters that have erupted ash and lava flows in the last few thousand years. Parts of Takawangha's edifice are hydrothermally altered and may be unstable, possibly leading to localized debris avalanches from its flanks. Takawangha lies across a saddle from historically active Tanaga volcano to the west. No historical eruptions are known from Takawangha; however, field work shows that recent eruptions have occurred and it is possible that historic eruptions attributed to Tanaga may instead have come from Takawangha.
(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: Takawangha (VNUM #311090)

Current Volcano Alert Level: ADVISORY

Current Aviation Color Code: YELLOW

Issued: Tuesday, January 24, 2017, 9:46 AM AKST
Source: Alaska Volcano Observatory
Notice Number: 2017/A71
Location: N 51 deg 52 min W 178 deg 1 min
Elevation: 4754 ft (1449 m)
Area: Aleutians

Volcanic Activity Summary: An energetic earthquake swarm on Tanaga Island started yesterday, January 23, and is continuing. The earthquakes locate 6 to 7 km ESE of Takawangha Volcano. This activity may be due to brittle failure in the surrounding rock caused by magma movement. AVO is therefore raising the Aviation Color Code to Yellow and Alert Level to Advisory for Takawangha Volcano. No eruptive activity has been detected in satellite data.

Recent Observations:
[Volcanic cloud height] Not applicable
[Other volcanic cloud information] Not applicable
[Lava flow/dome] Not applicable
[Lava flow] Not applicable

Remarks: Takawangha is a remote, 1,449 m (4,754 ft)-high stratovolcano located on the northeast portion of Tanaga Island, roughly 95 km (59 miles) west of Adak in the Andreanof Islands. Takawangha's summit is mostly ice-covered, except for four young craters that have erupted ash and lava flows in the last few thousand years. Parts of Takawangha's edifice are hydrothermally altered and may be unstable, possibly leading to localized debris avalanches from its flanks. Takawangha lies across a saddle from historically active Tanaga volcano to the west. No historical eruptions are known from Takawangha; however, field work shows that recent eruptions have occurred and it is possible that historic eruptions attributed to Tanaga may instead have come from Takawangha.

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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