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Alamagan Volcano, Northern Mariana Islands
Alamagan, seen here from the west with two peaks on either side of a roughly 350-m-deep summit crater, is the emergent summit of a large stratovolcano.
Low-angle lava platforms occur at the northern and southern coasts, whereas the eastern and western flanks are steeper.
The exposed cone is largely Holocene in age.
A 1.6 x 1 km graben cuts the SW flank.
Pyroclastic-flow deposits erupted about 1000 years ago have been dated, but reports of historical eruptions were considered invalid.
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).
PHOTO SOURCE: Norm Banks, 1981 (U.S. Geological Survey), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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