Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Okmok
The summit of 35-km-wide Okmok has two largely overlapping 10-km-wide calderas. Both calderas formed by voluminous eruptions of tephra and pyroclastic flows during the Holocene, one about 8,250 years ago and the other about 2,400 years ago. Numerous cones and lava domes formed on the caldera floor and flanks. Historical explosive eruptions and lava flows have originated from cones within the caldera. Photo by John Reeder (Alaska Division of Geological & Geophysical Surveys).
Volcano Number: 311290
Volcano Name: Okmok
Country: United States
Volcano Type: Shield
Last Eruption: 2008 CE
Elevation: 1073m
Tectonic Setting: Subduction zone / Intermediate crust (15-25 km)
Pop. within 100km: 4
Latitude: 53.43
Longitude: -168.13



Eruption Data from the Global Volcanism Program of the Smithsonian Institution
Emissions Data from the Global Volcanism Program of the Smithsonian Institution


Data from the Earthchem Library
Sorry. No data exist for this volcano in the EarthChem Library.
Data from the Earthchem Portal
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Data from the SESAR Database


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