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News
Monday, Jun 03, 2019
A small steam explosion occurred at the volcano yesterday morning (21:40 AKDT on 1 June local time), detected in local seismic data, the Alaska Volcano Observatory (AVO) reported. ... [more]
Friday, Jan 19, 2018
The recent unrest at the volcano, likely caused by a small intrusion of magma, has ended and the alert level was lowered to Green, the Alaska Volcano Observatory (AVO) reported earlier. ... [more]
 

Great Sitkin volcano

Stratovolcano 1740+ m / 5,709 ft
United States, Aleutian Islands, 52.08°N / -176.13°W
Current status: normal or dormant (1 out of 5) | Reports
Great Sitkin volcano books
Last update: 3 Jun 2019
Typical eruption style: unspecified
Great Sitkin volcano eruptions: 1974 
TimeMag. / DepthDistanceLocation
Wed, 13 Nov 2019
Wed, 13 Nov 21:10 UTCM 1.2 / 0.2 km1 km41km ENE of Adak, Alaska (USA)
Wed, 6 Nov 2019
Wed, 6 Nov 15:39 UTCM 0.6 / 0.2 km1 km42km ENE of Adak, Alaska (USA)
Tue, 5 Nov 2019
Tue, 5 Nov 22:14 UTCM 0.3 / 0.8 km0 km42km ENE of Adak, Alaska (USA)
Thu, 31 Oct 2019
Thu, 31 Oct 09:46 UTCM 0.4 / 11 km5 km45km ENE of Adak, Alaska (USA)
Wed, 30 Oct 2019
Wed, 30 Oct 23:18 UTCM 0.3 / 0.3 km0 km41km ENE of Adak, Alaska (USA)
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Background:

Constructed within the caldera of an older shield volcano forming the northern half of Great Sitkin Island, 1740-m-high Great Sitkin volcano contains a small, 0.8 x 1.2 km ice-filled summit caldera. Deep glacial valleys radiate from the summit, which lies at the eastern rim of the caldera, which was formed by massive edifice failure that produced a submarine debris avalanche that traveled more than 40 km to the north. The entire island is blanketed with a light-brown to black pumice layer up to 6 m thick. This deposit is overlain over much of the NW side of the island by ash deposits from a subsidiary vent NW of the caldera. Hot springs, mud pots, and fumaroles occur near the head of Big Fox Creek, south of the volcano. Historical eruptions have been recorded since the late-19th century. In 1945, a 400-600 m wide, flat-topped lava dome was emplaced through a glacier filling the steep-sided, 180-m-deep summit caldera.
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Smithsonian / GVP volcano information


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