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ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
U.S. Geological Survey
Wednesday, January 22, 2020, 10:55 PM AKST (Thursday, January 23, 2020, 07:55 UTC)


TAKAWANGHA VOLCANO (VNUM #311090)
51°52'1" N 178°1'37" W, Summit Elevation 4754 ft (1449 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

The USGS National Earthquake Information Center (NEIC) detected a large magnitude 6.2 earthquake 14 km east of Takawangha volcano and 22 km east of Tanaga volcano, north of Tanaga Island. The shallow (10 km depth) earthquake occurred at 05:53 UTC January 23 and followed a series of smaller magnitude 2-3 earthquakes in the same region earlier in the day. There is no clear evidence at this time that the M6.2 earthquake or earlier earthquakes are volcanic in nature, nor is there any indication that this seismic activity has any direct implications for future eruptive activity at Takawangha or Tanaga volcanoes. Numerous aftershocks have been recorded, and more are anticipated for a shallow earthquake of this magnitude. AVO will continue to closely monitor the seismic data from Tanaga Island for signs of volcanic unrest.

More information about the M6.2 earthquake can be found from the NEIC here: https://earthquake.usgs.gov/earthquakes/eventpage/us60007djn/executive
and from the Alaska Earthquake Center here: http://earthquake.alaska.edu/event/020124nifl


Takawangha is a remote, 1,449 m (4,754 ft)-high stratovolcano located on the northern 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.

OTHER ALASKA VOLCANOES

Information on all Alaska volcanoes is available at : http://www.avo.alaska.edu.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

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CONTACT INFORMATION:

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

David Fee, 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.
VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.
AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].
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Page modified: February 17, 2017 10:11
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