Bobrof Volcano
Bobrof
成層火山 · United States · 738m
- タイプ
- 成層火山
- 国
- United States
- 地域
- North America Volcanic Regions / Aleutian Ridge Volcanic Arc
- 標高
- 738m
- 座標
- 51.910, -177.438
- 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
- Basalt / Picro-Basalt
地質学的概要
The geology and timing of volcanism on this small uninhabited 3 x 4 km island, located in the Andreanof islands 50 km west of Adak and 15 km west of Kanaga volcano, are unknown (Coats, 1956). Apparent deposits of a massive submarine debris-avalanche deposit extend offshore to the NE. Smith et al. (1978) considered Bobrof to be of possible Holocene age. Andesitic pyroclastic-flow deposits are present on the 738-m-high volcano.
Wikipedia の要約
英語版の要約Bobrof Island is one of the Andreanof Islands subgroup of the Aleutian Islands in southwestern Alaska, United States. Bobrof Island is a small, uninhabited island about 9 miles (14 km) north and west of Kanaga Island, and 7 miles (11 km) northeast of Cape Sudak on Tanaga Island. Bobrof Island is 2.6 miles (4.2 km) long and 1.8 miles (2.9 km) wide with an area of 3 square miles (7.8 km2), and consists primarily of the 2,421-foot (738 m) high Bobrof Volcano. The volcanic crater, or cone, has been heavily dissected. Underwater deposits adjacent to the island's northeast flank suggest an immense debris-avalanche has taken place.
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