Tanaga volcano

Stratovolcanoes 1806 m / 5,925 ft
Aleutian Islands, 51.89°N / -178.15°W
Current status: normal or dormant (1 out of 5)
Last update: 1 Apr 2021 (Volcanic Alert Level lowered to 'Unassigned')

Tanaga volcano is the second largest volcano of the central Aleutians. It is the central and highest of 3 young stratovolcanoes oriented along a roughly E-W line at the NW tip of Tanaga Island.

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Typical eruption style: unspecified
Tanaga volcano eruptions: 1914

Latest nearby earthquakes

TimeMag. / DepthDistance/Location
Fri, 11 Jun 2021 (GMT) (5 earthquakes)
11 Jun 2021 21:04:35 GMT
1.7

9.4 km
37 km (23 mi)
133 Km WSW of Adak, Alaska
11 Jun 2021 17:07:51 GMT
0.1

6.8 km
19 km (12 mi)
84 Km W of Adak, Alaska
11 Jun 2021 09:00:23 GMT
0.8

1.8 km
24 km (15 mi)
Andreanof Islands, Aleutian Islands, Alaska
11 Jun 2021 07:52:46 GMT
0.7

1.8 km
24 km (15 mi)
80 Km W of Adak, Alaska
11 Jun 2021 06:48:57 GMT
2.1

88 km
46 km (29 mi)
58 Km W of Adak, Alaska

Background

Arcuate ridges to the east and south represent the rim of an arcuate caldera formed by collapse of an ancestral Tanaga volcano during the Pleistocene. Most Holocene eruptions originated from Tanaga volcano itself, which consists of two large cones, the western of which is the highest, constructed within a caldera whose 400-m-high rim is prominent to the SE. At the westernmost end of the Tanaga complex is conical Sajaka, a 1304-m-high double cone that may be the youngest of the three volcanoes. Sajaka One volcano collapsed during the late Holocene, producing a debris avalanche that swept into the sea, after which Sajaka Two cone was constructed within the collapse scarp.
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Smithsonian / GVP volcano information


See also: Sentinel hub | Landsat 8
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