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Belknap

楯状火山 · United States · 2094m

The McKenzie Pass area in the central Oregon Cascades contains one of the largest concentrations of recent volcanism in the United States. Belknap shield volcano, seen here from Black Crater to the SE, is capped by a smaller snow-covered cone. Lava flows from Belknap and the smaller Little Belknap shield volcano in front of it cover nearly 100 km2. Most of the largely unvegetated flows were erupted between about 2,900 and 1,500 years ago.
The McKenzie Pass area in the central Oregon Cascades contains one of the largest concentrations of recent volcanism in the United States. Belknap shield volcano, seen here from Black Crater to the SE, is capped by a smaller snow-covered cone. Lava flows from Belknap and the smaller Little Belknap shield volcano in front of it cover nearly 100 km2. Most of the largely unvegetated flows were erupted between about 2,900 and 1,500 years ago. · 写真: Photo by Lee Siebert, 1995 (Smithsonian Institution). · Wikimedia Commons
タイプ
楯状火山
国
United States
地域
North America Volcanic Regions / High Cascades Volcanic Arc
標高
2094m
座標
44.285, -121.842
最終噴火
475年
テクトニクス環境
Subduction zone / Continental crust (> 25 km)
火山地形
Shield
主要岩石
Andesite / Basaltic Andesite
地質学的概要

The Belknap Crater area near McKenzie Pass in Oregon, north of the Three Sisters volcanoes, was the source of one of the largest concentrations of youthful volcanism in the Cascade Range. The basaltic to basaltic andesite Belknap shield volcano, topped by the Belknap Crater pyroclastic cone and the Little Belknap shield volcano immediately to the east, have produced widespread late Holocene lava flows on all sides, much of which took place between about 3,000 and 1,500 years ago. Eruptions from the NE base of Belknap crater produced lava flows that traveled 15 km W into the McKenzie River valley.

Wikipedia の要約

英語版の要約

Belknap Crater is a shield volcano in the Cascade Range in the U.S. state of Oregon. Located in Linn County, it is associated with lava fields and numerous subfeatures including the Little Belknap and South Belknap volcanic cones. It lies north of McKenzie Pass and forms part of the Mount Washington Wilderness. Belknap is not forested and most of its lava flows are not vegetated, though there is some wildlife in the area around the volcano, as well as a number of tree molds formed by its eruptive activity.

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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
5050 BCE~4853 BCE · 1件 · 最大 VEI ?1104 BCE~906 BCE · 1件 · 最大 VEI 0709 BCE~512 BCE · 1件 · 最大 VEI 2278~475 · 1件 · 最大 VEI 25050 BCE3669 BCE2287 BCE1104 BCE278

詳細タイムライン

  1. 475年 (±215年)VEI 2地質学的推定
    475 ~ 進行中
    Belknap Crater
  2. 紀元前 685年 (±50年)VEI 2地質学的推定
    BCE 685 ~ 進行中
    South Belknap and Twin Craters
  3. 紀元前 1071年 (±241年)VEI 0地質学的推定
    BCE 1071 ~ 進行中
    Little Belknap
  4. 紀元前 5050年VEI ?地質学的推定
    BCE 5050 ~ 進行中

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。