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Alamagan volcano

Stratovolcano 744 m / 2,441 ft
United States, Mariana Islands, 17.6°N / 145.83°E
Current status: normal or dormant (1 out of 5) | Reports
Alamagan volcano books
Typical eruption style: unspecified
Alamagan volcano eruptions: 870 AD ± 100 years No recent earthquakes
TimeMag. / DepthDistanceLocation

Background:

Alamagan is the emergent summit of a large stratovolcano in the central Mariana Islands with a roughly 350-m-deep summit crater east of the center of the island. The exposed cone is largely Holocene in age. A 1.6 x 1 km graben cuts the SW flank. An extensive basaltic-andesite lava flow has extended the northern coast of the island, and a lava platform also occurs on the south flank. Pyroclastic-flow deposits erupted about 1000 years ago have been dated, but reports of historical eruptions were considered invalid (Moore and Trusdell, 1993).
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Smithsonian / GVP volcano information


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