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Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Great Sitkin
Great Sitkin in the Andreanof Islands is seen here from Finger Bay on Adak Island. The edifice was constructed within a caldera, part of which forms the high snow-covered peak to the right. The post-caldera cone contains a 0.8 x 1.2 km ice-filled summit crater. The rim forms the irregular summit on the left horizon. A lava dome 400-600 m wide was emplaced through a glacier in 1945. Photo by Fred Zeillemaker, 1982 (U.S. Fish and Wildlife Service, courtesy of Alaska Volcano Observatory).
Volcano Number:
311120
Volcano Name:
Great Sitkin
Country:
United States
Volcano Type:
Stratovolcano
Last Eruption:
2025 CE
Elevation:
1740m
Tectonic Setting:
Subduction zone / Intermediate crust (15-25 km)
Latitude:
52.076
Longitude:
-176.13
Details
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The Great Sitkin volcano forms much of the northern side of Great Sitkin Island. A younger volcano capped by a small, 0.8 x 1.2 km ice-filled summit caldera was constructed within a large late-Pleistocene or early Holocene scarp formed by massive edifice failure that truncated an older edifice and produced a submarine debris avalanche. Deposits from this and an even older debris avalanche from a source to the south cover a broad area of the ocean floor north of the volcano. The summit lies along the eastern rim of the younger collapse scarp. Deposits from an earlier caldera-forming eruption of unknown age cover the flanks of the island to a depth up to 6 m. The small younger caldera was partially filled by lava domes emplaced in 1945 and 1974, and five small older flank lava domes, two of which lie on the coastline, were constructed along northwest- and NNW-trending lines. Hot springs, mud pots, and fumaroles occur near the head of Big Fox Creek, south of the volcano. Eruptions have been recorded since the late-19th century.
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Eruption Data from the Global Volcanism Program of the Smithsonian Institution
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Emissions Data from the Global Volcanism Program of the Smithsonian Institution
Sorry. No emissions data found for this volcano.
Data from the Earthchem Library
Sorry. No data exist for this volcano in the EarthChem Library.
Data from the Earthchem Portal
Sorry. No data exist for this volcano in the EarthChem Portal.
Data from the SESAR Database
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Data from the MaGa Database
Sorry. No data exist for this volcano in the MaGa database.
Data from UNAVCO
Sorry. No data exist for this volcano in the UNAVCO database.
Data from USIEI
Sorry. This volcano is not covered by any USIEI projects
Data from IRIS FDSNWS
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