St. Andrew Strait
복합화산 · Papua New Guinea · 270m
- 화산 유형
- 복합화산
- 국가
- Papua New Guinea
- 지역
- Southwestern Pacific Volcanic Regions / Bismarck Sea Volcanic Province
- 해발
- 270m
- 좌표
- -2.380, 147.350
- 마지막 분화
- 1957년
- 판구조 환경
- Subduction zone / Oceanic crust (< 15 km)
- 화산 지형
- Composite
- 주요 암석
- Rhyolite
지질학적 요약
The St. Andrew Strait volcano, located in the Admiralty Islands north of Papua New Guinea, consists of a series of overlapping Quaternary cones formed by rhyolitic lava flows and pyroclastic materials on Lou and Tuluman Islands. Volcanism is aligned on a curved arc extending through the 12-km-long Lou Island. The Tuluman Islands, 1.5 km S of Lou Island, were formed during a 1953-1957 eruption. Pam Lin and Pam Mandian Islands farther to the SE along the same arc contain fresh rhyolitic obsidian similar to that found on Tuluman.
Wikipedia 요약
영어 요약St. Andrew Strait is a compound volcano in Papua New Guinea that has had eruptions in historical times. The volcano is not linked to any tectonic plates, the volcano is also in an area of very few earthquakes, suggesting that St. Andrew Strait is an Intraplate volcano. It consists of a group of Quaternary volcanic cones that are mainly rhyolitic in composition. The volcanism is curved, suggesting that the volcano has an ancient caldera. The centre of the volcano is Lou Island. Lou island last erupted in 240 BC and 340 AD, both eruptions came from the Bendal volcano. Lou island is the largest eruptive centre of the volcano, with 6 volcanic vents. The Pam Islands also contain fresh deposits. Historic eruptions have come from the Tuluman Islands.
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분화 이력
상세 타임라인
- 1953년VEI 2관측 기록1953-06-27 ~ 1957-01-28Tuluman
- 1931년VEI 0지질학적 추정1931 ~ 진행 중Tuluman (?)
- 1883년VEI 2관측 기록1883-03-28 ~ 진행 중Tuluman
- 350년VEI ?지질학적 추정350 ~ 진행 중Lou Island (Bedal volcano)
- 기원전 240년 (±100년)VEI ?지질학적 추정BCE 240 ~ 진행 중Lou Island (Bedal volcano)
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