What the records say
- When
- 29 Aug 1878
- Kind
- Volcanic eruption
- Where
- United States
- Coordinates
- 53.43° N, 168.13° W
- Vei
- 2
- Volcano type
- Shield volcano
Mount Okmok
Volcano on eastern Umnak Island in the central-eastern Aleutian Islands of Alaska
Mount Okmok is a volcano on eastern Umnak Island, in the central-eastern Aleutian Islands of Alaska. Part of the Aleutian Volcanic Arc, it was formed by the subduction of the oceanic Pacific Plate under the North American Plate. Okmok is a large shield volcano capped by a 10-kilometer (6.2 mi) wide caldera. The caldera contains numerous cinder cones, their lava flows, and a few lakes.
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2 sources record it
- NCEI significant earthquakes, tsunamis and volcanic eruptionsNOAA National Centers for Environmental InformationPublic domainSource page
- Smithsonian GVP Volcanoes of the World: Holocene eruptionsGlobal Volcanism Program, Smithsonian InstitutionSmithsonian terms of use: personal, educational and non-commercial use, with creditGlobal Volcanism Program, Smithsonian Institution: Volcanoes of the World v5.3, https://doi.org/10.5479/si.GVP.VOTW5-2025.5.3Source page