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Great Sitkin volcano

Updated: Nov 29, 2023 09:06 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: 22 Nov 2023 (Smithsonian / USGS Weekly Volcanic Activity Report)

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

Latest nearby earthquakes

TimeMag. / DepthDistance/Location
Tuesday, November 28, 2023 GMT (1 quake)
Nov 27, 05:54 pm (Adak)
(Nov 28, 03:54 GMT)

4.7 km
1.5 km (0.9 mi)
41 Km NE of Adak, Alaska
Tuesday, November 21, 2023 GMT (1 quake)
Nov 20, 09:04 pm (Adak)
(Nov 21, 06:04 GMT)

3.1 km
2.6 km (1.6 mi)
Andreanof Islands, Aleutian Islands, Alaska
Saturday, November 18, 2023 GMT (1 quake)
Nov 17, 02:43 pm (Adak)
(Nov 18, 00:43 GMT)

2.3 km
2.7 km (1.7 mi)
39 Km ENE of Adak, Alaska
Friday, November 17, 2023 GMT (1 quake)
Nov 17, 04:53 am (GMT -10)
(Nov 17, 14:53 GMT)

128 km
35 km (22 mi)
20 mi north of Adak, Aleutians West, Alaska, USA
Thursday, November 16, 2023 GMT (1 quake)
Nov 16, 11:49 am (Adak)
(Nov 16, 21:49 GMT)

1.8 km
1.2 km (0.7 mi)
41 Km NE of Adak, Alaska


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.
Smithsonian / GVP volcano information

See also: Sentinel hub | Landsat 8 | NASA FIRMS
Wed, 22 Nov 2023, 15:00

Great Sitkin volcano (Andreanof Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 15 November-21 November 2023 (Continuing Activity)

AVO reported that slow lava effusion continued at Great Sitkin during 15-21 November, confirmed at least through 16 November by a radar image. The thick flow in the summit crater mainly expanded E. Seismicity was low. ... Read all
Wed, 15 Nov 2023, 15:00

Great Sitkin volcano (Andreanof Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 8 November-14 November 2023 (Continuing Activity)

AVO reported that slow lava effusion likely continued at Great Sitkin during 8-14 November. Views of the summit were obscured by weather clouds during most days; however, satellite radar observations on 8 November indicated continued surface growth concentrated on the E area of the summit lava flow. Seismicity was low with only a few local earthquakes recorded by the seismic network during the week. ... Read all
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