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West Crater

火山原 · United States · 1329m

West Crater is a Quaternary volcanic field in the southern Cascades of Washington between Mount St. Helens and Mount Hood. West Crater itself, seen here from the NE, is an andesite lava dome with two small lava flows, one of which forms the bare area in the center. The 290-m-high dome formed about 8,000 years ago on the floor of a cirque carved into older Tertiary volcanic rocks. The West Crater volcanic field consists of a series of small shield volcanoes and scoria cones along a NW-SE zone.
West Crater is a Quaternary volcanic field in the southern Cascades of Washington between Mount St. Helens and Mount Hood. West Crater itself, seen here from the NE, is an andesite lava dome with two small lava flows, one of which forms the bare area in the center. The 290-m-high dome formed about 8,000 years ago on the floor of a cirque carved into older Tertiary volcanic rocks. The West Crater volcanic field consists of a series of small shield volcanoes and scoria cones along a NW-SE zone. · 写真: Photo by Lee Siebert, 2002 (Smithsonian Institution). · Wikimedia Commons
タイプ
火山原
国
United States
地域
North America Volcanic Regions / High Cascades Volcanic Arc
標高
1329m
座標
45.880, -122.080
最終噴火
-5750年
テクトニクス環境
Subduction zone / Continental crust (> 25 km)
火山地形
Cluster
主要岩石
Andesite / Basaltic Andesite
地質学的概要

West Crater, a small andesitic lava dome with associated lava flows, is part of a Quaternary volcanic field in southern Washington consisting primarily of small basaltic and basaltic andesite cinder cones and shield volcanoes, oriented along a NW-SE zone to the SE of St. Helens. This 20-km-wide zone extends from Marble Mountain, north of Swift Reservoir, to south of Trout Creek Hill. The Pleistocene basaltic Trout Creek Hill shield volcano produced a lava flow about 340,000 years ago that traveled 20 km SE, temporarily damming the Columbia River. At least three vents in this field are of Holocene age: West Crater, a small cone at Hackamore Creek, and a phreatic crater at the summit of Bare Mountain. The latest eruptions at these locations have been dated at about 8,000 years before present, and have included emplacement of an andesitic lava dome and associated lava flow at West Crater and formation of a phreatic explosion crater at Bare Mountain.

Wikipedia の要約

英語版の要約

West Crater is a small lava dome with associated lava flows in southern Washington, United States. Located in Skamania County, it rises to an elevation of 4,131 feet (1,259 m), and forms part of the Cascade Volcanic Arc. It is also part of the Marble Mountain-Trout Creek Hill volcanic field, a little-known Quaternary volcanic field in the southern Cascades of Washington state. The area can be hiked, and can be accessed by roads in the Gifford Pinchot National Forest.

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噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
6110 BCE~6074 BCE · 1件 · 最大 VEI 25786 BCE~5750 BCE · 1件 · 最大 VEI 26110 BCE6038 BCE5930 BCE5858 BCE5786 BCE

詳細タイムライン

  1. 紀元前 5750年VEI 2地質学的推定
    BCE 5750 ~ 進行中
    Bare Mountain
  2. 紀元前 6110年VEI 2地質学的推定
    BCE 6110 ~ 進行中
    West Crater, Hackamore Creek cone

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。