Alamagan
성층화산 · United States · 744m
- 화산 유형
- 성층화산
- 국가
- United States
- 지역
- Northwestern Pacific Volcanic Regions / Mariana Volcanic Arc
- 해발
- 744m
- 좌표
- 17.600, 145.830
- 마지막 분화
- 870년
- 판구조 환경
- Subduction zone / Crustal thickness unknown
- 화산 지형
- Composite
- 주요 암석
- Andesite / Basaltic Andesite
지질학적 요약
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).
Wikipedia 요약
영어 요약Alamagan 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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분화 이력
상세 타임라인
- 1887년VEI ?지질학적 추정1887-11-29 ~ 진행 중
- 1864년VEI ?지질학적 추정1864-01 ~ 진행 중
- 870년 (±100년)VEI 4지질학적 추정870 ~ 진행 중
- 540년 (±75년)VEI ?지질학적 추정540 ~ 진행 중
외부 링크
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