St. Andrew Strait
複成火山 · Papua New Guinea · 270m
- タイプ
- 複成火山
- 国
- Papua New Guinea
- 地域
- Southwestern Pacific Volcanic Regions / Bismarck Sea Volcanic Province
- 標高
- 270m
- 座標
- -2.380, 147.350
- 最終噴火
- 1957年
- テクトニクス環境
- Subduction zone / Oceanic crust (< 15 km)
- 火山地形
- Composite
- 主要岩石
- Rhyolite
地質学的概要
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 の要約
英語版の要約St. 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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噴火履歴
詳細タイムライン
- 1953年VEI 2観測記録1953-06-27 ~ 1957-01-28Tuluman
- 1931年VEI 0地質学的推定1931 ~ 進行中Tuluman (?)
- 1883年VEI 2観測記録1883-03-28 ~ 進行中Tuluman
- 350年VEI ?地質学的推定350 ~ 進行中Lou Island (Bedal volcano)
- 紀元前 240年 (±100年)VEI ?地質学的推定BCE 240 ~ 進行中Lou Island (Bedal volcano)
外部リンク
⚠ 参考情報です。緊急対応には使用しないでください。