カナダ · 割れ目火口
Cobb Segment
- タイプ
- 割れ目火口
- 標高
- 2100m (海底)
- 最終噴火
- -1180年
- タイプ
- 割れ目火口
- 国
- カナダ
- 地域
- 東太平洋 / Northeast Pacific Rifts Volcanic Province
- 標高
- 2100m (海底)
- 座標
- 46.880, -129.330
- 最終噴火
- -1180年
- テクトニクス環境
- リフト帯 / 海洋地殻 (< 15 km)
- 火山地形
- 火山群
- 主要岩石
- 玄武岩 / ピクライト質玄武岩
地質学的概要
The Cobb Segment is in the northern part of the Juan de Fuca Ridge, south of the Endeavour Ridge segment. This 150-km-long segment, also known as the Northern Symmetrical or NSymm Segment, is the longest of the Juan de Fuca Ridge. It has a narrow axial crest, 1-2 km wide, with a shallow graben that has a high point at about 2,300 m depth. A prominent seamount with hydrothermal deposits at its summit lies just west of the axis high and was the source of a broad area of young, mostly sediment-free lava flows. As with other Juan de Fuca Ridge segments, a shallow magma source is thought to underlie the Cobb Segment, and a preliminary Uranium-series date of Holocene age was obtained on a basaltic lava flow.
Wikipedia の要約
英語版の要約Cobb Seamount is a seamount and guyot located 500 km (310 mi) west of Grays Harbor, Washington, United States. Cobb Seamount is one of the seamounts in the Cobb–Eickelberg Seamount chain, a chain of underwater volcanoes created by the Cobb hotspot that terminates near the coast of Alaska. It lies just west of the Cascadia subduction zone, and was discovered in August 1950 by the U.S. Fish and Wildlife Service fisheries research vessel R/V John N. Cobb . By 1967, over 927 km (576 mi) of soundings and dozens of samples from the seamount had been collected.
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噴火履歴
1件の記録用語集詳細タイムライン
- 紀元前 1180年VEI ?地質学的推定紀元前 1180 ~ 終了日不明
近くの火山
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。