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Uratman

성층화산 · 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. · 사진: Photo by Yoshihiro Ishizuka, 2000 (Hokkaido University). · Wikimedia Commons
화산 유형
성층화산
국가
Russia
지역
북서태평양 / Kuril Volcanic Arc
해발
678m
좌표
47.120, 152.250
마지막 분화
미확인
판구조 환경
Subduction zone / Oceanic crust (< 15 km)
화산 지형
Composite
주요 암석
Andesite / Basaltic Andesite
지질학적 요약

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.

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