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)
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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Great Sitkin volcano eruptions: 2021, 1974
Latest nearby earthquakes
| Time | Mag. / Depth | Distance/Location | ||
| Tuesday, November 28, 2023 GMT (1 quake) | ||||
| Nov 27, 05:54 pm (Adak) (Nov 28, 03:54 GMT) | 0.7 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) | 0.6 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) | 0.5 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) | 4.1 128 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) | 0.6 1.8 km | 1.2 km (0.7 mi) 41 Km NE of Adak, Alaska | ||
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.---
Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8 | NASA FIRMS
