United States · Stratovolcano
Alamagan
- Type
- Stratovolcano
- Elevation
- 744m
- Last eruption
- 870
- Type
- Stratovolcano
- Country
- United States
- Region
- Northwestern Pacific / Mariana Volcanic Arc
- Elevation
- 744m
- Coordinates
- 17.600, 145.830
- Last eruption
- 870
- Tectonic setting
- Subduction zone / Crustal thickness unknown
- Landform
- Composite
- Major rock type
- Andesite / Basaltic andesite
Geological summary
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 S flank. Pyroclastic-flow deposits erupted about 1000 years ago have been dated, but reports of historical eruptions were considered invalid (Moore and Trusdell, 1993).
From Wikipedia
Alamagan is an island in the Northern Mariana Islands in the Pacific Ocean, 30 kilometres (16 nmi) north of Guguan, 250 kilometres (135 nmi) north of Saipan, and 60 kilometres (32 nmi) south of Pagan. It is currently undergoing resettlement since 2018, with a few people living there. The project was coordinated by the Northern Islands Mayor's office and the people there have radio contact with the mainland.
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Eruption history
4 recordedGlossaryDetailed timeline
- 1887VEI ?Method not stated1887-11-29 – end unknown
- 1864VEI ?Method not stated1864-01-16 – end unknown
- 870 (±100 yrs)VEI 4Geological estimate870 – end unknown
- 540 (±75 yrs)VEI ?Geological estimate540 – end unknown
Nearby volcanoes
External links
⚠ For reference only. Not for emergency response.