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Vsevidof

成層火山 · United States · 2160m

Mount Vsevidof is allocated on SW Umnak Island. The historically active volcano, seen here from the south, contains an E-W zone of scoria cones on the W flank that fed many lava flows, including a large flow that reached the west coast of the island and formed Cape Kigushimkada.
Mount Vsevidof is allocated on SW Umnak Island. The historically active volcano, seen here from the south, contains an E-W zone of scoria cones on the W flank that fed many lava flows, including a large flow that reached the west coast of the island and formed Cape Kigushimkada. · 写真: Photo by Chris Nye (Alaska Division of Geological & Geophysical Surveys). · 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
2160m
座標
53.126, -168.688
最終噴火
1878年
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 symmetrical Vsevidof stratovolcano, near the SW end of Umnak Island, contains a 1.2-km-wide, ice-filled summit crater that is breached by glaciers on the E and N sides. An E-W-trending zone of scoria cones that extends down much of the W flank has been the source of recorded eruptions. Most of the cone was constructed during the Holocene. Andesitic and dacitic lava flows originated from vents on the N and S flanks, and on the W-flank rift. The largest lava flow traveled down the W flank to the coast, forming Cape Kigushimkada.

Wikipedia の要約

英語版の要約

Mount Vsevidof is a stratovolcano in the U.S. state of Alaska. Its summit is the highest point on Umnak Island, one of the eastern Aleutian Islands. Its symmetrical cone rises abruptly from its surroundings. The base of the volcano is around 10 km (6 mi) wide, steepening from about 15 degrees at 300 m (980 ft) altitude to around 30 degrees near the summit. Some glacial tongues have cut through narrow canyons up to 120 m (390 ft) deep, due to ice filling the crater and extending down the north and east flanks of the cone. It is most likely that Mount Vsevidof has not erupted in historic time. Reports of its latest eruption in 1957 is considered questionable by the Alaska Volcano Observatory. This also includes possible eruptions or activity which may have occurred at the volcano in 1784, 1790, 1830, 1878, and 1880.

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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
1784~1801 · 2件 · 最大 VEI ?1801~1819 · 1件 · 最大 VEI 31819~1836 · 1件 · 最大 VEI ?1871~1888 · 2件 · 最大 VEI 21940~1957 · 1件 · 最大 VEI 217841819187119051940

詳細タイムライン

  1. 1957年VEI 2地質学的推定
    1957-03-11 ~ 1957-03-12
    West flank fissure
  2. 1880年VEI ?地質学的推定
    1880-07-02 ~ 進行中
  3. 1878年VEI 2観測記録
    1878-07-02 ~ 進行中
    West flank fissure ?
  4. 1830年VEI ?観測記録
    1830-07-02 ~ 進行中
    SW end of Umnak Island
  5. 1817年VEI 3観測記録
    1817-07-02 ~ 進行中
  6. 1790年VEI ?地質学的推定
    1790-05-30 ~ 進行中
  7. 1784年VEI ?地質学的推定
    1784 ~ 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。