太郎山

Omanago Group

溶岩ドーム · Japan · 2341m

The Omanago volcano group (upper left) consists of a series of five lava domes in Nikko National Park. The highest dome is Omanago, located at the SE end of the complex. Mitsudake is the NW-most dome. The higher northern peak of the Mitsudake complex is out of view to the left, and the lower southern dome forms the low ridge behind the hot spring resort of Yunoko lake in the center of the photo. The peak on the right horizon is Nantaisan. · 写真: Photo by Lee Siebert, 1964 (Smithsonian Institution). · Wikimedia Commons

タイプ: 溶岩ドーム
国: Japan
地域: 北西太平洋 / Northeast Japan Volcanic Arc
標高: 2341m
座標: 36.807, 139.476
最終噴火: -3050年
テクトニクス環境: Subduction zone / Continental crust (> 25 km)
火山地形: Cluster
主要岩石: Dacite

地質学的概要

The Omanago volcano group consists of a series of five closely spaced lava domes that were constructed north and NW of Nantai volcano in Nikko National Park. The highest of the dacitic domes is Omanago, which later erupted andesitic lavas. The Mitsudake dome, which overlooks the hot spring resort of Lake Yunoko, was radiocarbon dated at about 5,000 years ago. Mitsudake was constructed on a southerly dipping slope, so that the southern of its two flat-topped domes is lower, and is overlapped by sediments of the Senjogahara plain.

噴火履歴

概要 (VEI時系列)

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詳細タイムライン

紀元前 3050年VEI ?地質学的推定
BCE 3050 ~ 進行中
Mitsu-dake

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。