Dawson Strait Group

火山原 · Papua New Guinea · 500m

The Dawson Straits, seen in this NASA Landsat image, is located between eastern Fergusson Island (upper left) and northwestern Normanby Island (lower left) in the D'Entrecasteaux island group. The area contains a volcanic field with several young volcanic centers that erupted rhyolitic obsidian flows. Mount Oiau is located on the narrow peninsula (left center) forming the southernmost point on Fergusson Island. A large crater is visible on Dobu Island, southeast of Oiau. Young volcanic rocks are also found on Sanaroa Island (upper right). · 写真: NASA Landsat 7 image (worldwind.arc.nasa.gov)

タイプ: 火山原
国: Papua New Guinea
地域: Southwestern Pacific Volcanic Regions / Trobriand Volcanic Province
標高: 500m
座標: -9.620, 150.880
最終噴火: 1350年
テクトニクス環境: Subduction zone / Continental crust (> 25 km)
火山地形: Cluster
主要岩石: Rhyolite

地質学的概要

The Dawson Straits, located between eastern Fergusson and western Normanby Islands in the D'Entrecasteaux island group, contains a volcanic field with several centers that define a possible partly submerged caldera. There have been no historical eruptions, but morphology suggests an extremely young age for some lava flows, and the area displays vigorous thermal activity. The most prominent volcanic centers are Mounts Lamonai and Oiau, located about 10 km apart on the SW tip of Fergusson Island. The summit of Lamonai is capped by a steep-walled crater, and rhyolitic lava flows are exposed on the NE side of the cone. The dominantly volcaniclastic Oiau cone has also produced obsidian lava flows. Dobu Island to the south is formed of coalescing volcanic centers and likewise has produced youthful rhyolitic obsidian flows.

噴火履歴

概要 (VEI時系列)

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詳細タイムライン

1350年VEI ?地質学的推定
1350 ~ 進行中
Oiau

外部リンク

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