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Great Sitkin volcano

Updated: Sep 27, 2022 19:08 GMT -
Stratovolcano 1740+ m / 5,709 ft
United States, Aleutian Islands, 52.08°N / -176.13°W
Current status: minor activity or eruption warning (3 out of 5)
Last update: 14 Sep 2022 (Smithsonian / USGS Weekly Volcanic Activity Report)

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Typical eruption style: unspecified
Great Sitkin volcano eruptions: 2021, 1974

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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


See also: Sentinel hub | Landsat 8 | NASA FIRMS
Wed, 14 Sep 2022, 14:00

Great Sitkin volcano (Andreanof Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 7 September-13 September 2022 (Continuing Activity)

AVO reported that slow lava effusion at Great Sitkin likely continued during 6-13 September, though weather cloud cover prevented visual confirmation with webcam and satellite images. Seismicity was very low. Weakly-elevated surface temperatures consistent with lava effusion in the summit crater were identified overnight during 12-13 September. ... Read all
Thu, 8 Sep 2022, 10:00

Great Sitkin volcano (Andreanof Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 7 September-13 September 2022 (Continuing Activity)

AVO reported that slow lava effusion at Great Sitkin likely continued during 6-13 September, though weather cloud cover prevented visual confirmation with webcam and satellite images. Seismicity was very low. Weakly-elevated surface temperatures consistent with lava effusion in the summit crater were identified overnight during 12-13 September. ... Read all
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