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Country: | United States | |
| Subregion Name: | Mariana Islands | ||
| Volcano Number: | 0804-18= | ||
| Volcano Type: | Stratovolcano | ||
| Volcano Status: | Radiocarbon | ||
| Last Known Eruption: | 870 AD ± 100 years | ||
| Summit Elevation: | 744 m | 2,441 feet | |
| Latitude: | 17.60°N | 17°36'0"N | |
| Longitude: | 145.83°E | 145°50'0"E | |
| 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). | |||
