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News
Thursday, Jul 30, 2020
The Alaskan Volcano Observatory (AVO) report low-level unrest at Great Sitkin continues. Occasional small local earthquakes have occurred at the volcano over the past day. No explosive activity was detected by infrasound sensors. No activity was observed in cloudy satellite and web camera imagery. ... read all
 

Great Sitkin volcano

Stratovolcano 1740+ m / 5,709 ft
United States, Aleutian Islands, 52.08°N / -176.13°W
Current status: restless (2 out of 5)
Great Sitkin webcams / live data | Reports
Great Sitkin volcano books
Last update: 16 Sep 2020 (Small local earthquakes have continued to occur over the past 24, suggesting signs of elevated unrest above known background level however no eruptive activity has yet been detected. Cloudy conditions obscure views of the volcano summit by web cameras and)
Typical eruption style: unspecified
Great Sitkin volcano eruptions: 1974 
TimeMag. / DepthDistanceLocation
Thu, 24 Sep 2020
Thu, 24 Sep 23:09 UTCM 0.1 / 6.9 km7 km40 Km ENE of Adak, Alaska, USA
Thu, 17 Sep 2020
Thu, 17 Sep 06:06 UTCM 1.1 / 4.8 km1 km42 Km ENE of Adak, Alaska, USA
Thu, 17 Sep 05:53 UTCM 0.9 / 5.1 km1 km41 Km ENE of Adak, Alaska, USA
Fri, 11 Sep 2020
Fri, 11 Sep 14:11 UTCM 0.4 / 8.8 km5 km41 Km ENE of Adak, Alaska (USA)
Thu, 10 Sep 2020
Thu, 10 Sep 21:00 UTCM 0.3 / 8.8 km6 km47 Km ENE of Adak, Alaska (USA)
View all recent quakes

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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See also: Sentinel hub | Landsat 8
 

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