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三日月山

Uratman

成層火山 · Russia · 678m

A large post-caldera cone (upper left) was constructed in the SE part of the Uratman caldera, the northernmost volcano on Simushir Island. The caldera is partially filled by Brouton Bay, shown here. Two cones and a lava dome are on the northern flank of the larger cone in this view from the NE caldera rim.
A large post-caldera cone (upper left) was constructed in the SE part of the Uratman caldera, the northernmost volcano on Simushir Island. The caldera is partially filled by Brouton Bay, shown here. Two cones and a lava dome are on the northern flank of the larger cone in this view from the NE caldera rim. · 写真: Photo by Yoshihiro Ishizuka, 2000 (Hokkaido University). · Wikimedia Commons
タイプ
成層火山
国
Russia
地域
Northwestern Pacific Volcanic Regions / Kuril Volcanic Arc
標高
678m
座標
47.120, 152.250
最終噴火
不明
テクトニクス環境
Subduction zone / Oceanic crust (< 15 km)
火山地形
Composite
主要岩石
Andesite / Basaltic Andesite
地質学的概要

The northernmost volcano on Simushir Island, Uratman consists of a 7.5-km-wide Pleistocene caldera with walls that rise 450 m above a 250-m-deep caldera bay. A narrow gap in the northern rim provides ocean access into Brouton Bay, which fills the NW half of the caldera. The andesitic central cone grew during the Holocene in the SE part of the caldera. Two cinder cones are located along the N flank of Uratman, and a lava dome was formed on its NW flank along Brouton Bay. No recorded eruptions are known.

Wikipedia の要約

英語版の要約

Uratman is a somma volcano located at the northern end of Simushir Island, Kuril Islands, Russia. It consists of a Pleistocene caldera which contains an andesite cone of Holocene age. The caldera is exposed to the ocean, forming Brouton Bay.

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