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チャグラク島

Chagulak

成層火山 · United States · 1028m

The eastern side of the Chagulak volcano is seen here in the foreground and Amukta is in the background. The two volcanoes join at depth but at the surface they are separated by 7 km of ocean.
The eastern side of the Chagulak volcano is seen here in the foreground and Amukta is in the background. The two volcanoes join at depth but at the surface they are separated by 7 km of ocean. · 写真: Photo by Fred Deines, 1992 (U.S. Fish and Wildlife Service). · Wikimedia Commons
タイプ
成層火山
国
United States
地域
北アメリカ / Aleutian Ridge Volcanic Arc
標高
1028m
座標
52.572, -171.138
最終噴火
不明
テクトニクス環境
Subduction zone / Intermediate crust (15-25 km)
火山地形
Composite
主要岩石
Andesite / Basaltic Andesite
地質学的概要

The 3-km-diameter island of Chagulak is the exposed summit of a stratovolcano in the Islands of the Four Mountains group of the Aleutians. The sharp-topped summit is ~11 km NE of the summit of Amukta and 35 km W of Yunaska volcano. The visible edifice is steep and strongly eroded. No eruptions have been recorded and its age is not precisely known.

Wikipedia の要約

英語版の要約

Chagulak Island is a small, uninhabited volcanic island in the Islands of Four Mountains group in the Aleutian Islands of southwestern Alaska, United States. The 1.9 mi (3.1 km)-wide island consists of a single cone that reaches an elevation of 3,747 ft. Chagulak is a stratovolcano and is separated from the nearby Amukta Island by a channel about 4.3 miles (6.9 km) wide; though the two islands are joined underwater. No eruptions have been recorded and very little is known about the volcano, as the only study done on Chagulak so far is a single chemical analysis of a "low-potassium, high-alumina basaltic andesite" from the north shore.

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