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セロアスル火山

Azul, Cerro

楯状火山 · Ecuador · 1640m

A large tuff cone occupies the ENE side of the summit caldera of Cerro Azul volcano at the SW tip of Isabela Island. A small caldera bench is seen above the cone at the upper right, and a larger bench on the northern side of the caldera is outlined by the light-colored line below the horizon at the upper left. The 4 x 5 km wide caldera is one of the smallest of the Galápagos shield volcanoes, but its 650 m depth makes it one of the deepest. Youthful dark-colored lava flows at the left cover much of the caldera floor.
A large tuff cone occupies the ENE side of the summit caldera of Cerro Azul volcano at the SW tip of Isabela Island. A small caldera bench is seen above the cone at the upper right, and a larger bench on the northern side of the caldera is outlined by the light-colored line below the horizon at the upper left. The 4 x 5 km wide caldera is one of the smallest of the Galápagos shield volcanoes, but its 650 m depth makes it one of the deepest. Youthful dark-colored lava flows at the left cover much of the caldera floor. · 写真: Photo by Tom Simkin (Smithsonian Institution). · Wikimedia Commons
タイプ
楯状火山
国
Ecuador
地域
Eastern Pacific Volcanic Regions / Galapagos Hotspot Volcano Group
標高
1640m
座標
-0.920, -91.408
最終噴火
2008年
テクトニクス環境
Rift zone / Oceanic crust (< 15 km)
火山地形
Shield
主要岩石
Basalt / Picro-Basalt
地質学的概要

Located at the SW tip of the J-shaped Isabela Island, Cerro Azul contains a steep-walled 4 x 5 km nested summit caldera complex that is one of the smallest diameter, but at 650 m one of the deepest in the Galápagos Islands. The shield volcano is the second highest of the archipelago. A conspicuous bench occupies the SW and west sides of the caldera, which formed during several episodes of collapse. Youthful lava flows cover much of the caldera floor, which has also contained ephemeral lakes. A prominent tuff cone located at the ENE side of the caldera is evidence of episodic hydrovolcanism. Numerous spatter cones dot the western flanks. Fresh-looking lava flows, many erupted from circumferential fissures, descend the NE and NW flanks. Historical eruptions date back only to 1932, but Cerro Azul has been one of the most active Galápagos volcanoes since that time. Solfataric activity continues within the caldera.

Wikipedia の要約

英語版の要約

Cerro Azul is a shield volcano on the south western part of Isabela Island in the Galápagos Islands. At a height of 1,689 m (5,541 ft) it is the second highest peak in the Galapagos and due to its topographic prominence of over 1,500 m (4,921 ft) it is categorised as an ultra. The volcano is one of the most active in the Galapagos, with the last eruption between May and June 2008.

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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
950 BCE~753 BCE · 1件 · 最大 VEI 0556 BCE~358 BCE · 1件 · 最大 VEI 01219~1416 · 1件 · 最大 VEI 01811~2008 · 12件 · 最大 VEI 3950 BCE161 BCE43012191811

詳細タイムライン

  1. 2008年VEI 1観測記録
    2008-05-29 ~ 2008-06-17
    Summit and SE flank
  2. 1998年VEI 1観測記録
    1998-09-15 ~ 1998-10-21
    N & W caldera floor, SE flank (630-680 m)
  3. 1979年VEI 2観測記録
    1979-01-29 ~ 1979-03-04
    East flank (300 m) and summit
  4. 1968年VEI ?地質学的推定
    1968-06-12 ~ 進行中
    North flank?
  5. 1959年VEI 2観測記録
    1959-06-29 ~ 1959-07-31
    East flank
  6. 1951年VEI ?観測記録
    1951-07-02 ~ 進行中
  7. 1949年VEI 0観測記録
    1949 ~ 進行中
  8. 1948年VEI 0観測記録
    1948-06-30 ~ 進行中
  9. 1943年VEI 3観測記録
    1943-04-13 ~ 1943-05-11
    Caldera ring fracture
  10. 1940年VEI 0観測記録
    1940 ~ 進行中
    East flank (Cerro de Las Animas)
  11. 1932年VEI 1観測記録
    1932 ~ 進行中
  12. 1850年VEI ?地質学的推定
    1850 ~ 進行中
  13. 1250年VEI 0地質学的推定
    1250 ~ 進行中
  14. 紀元前 550年 (±1300年)VEI 0地質学的推定
    BCE 550 ~ 進行中
  15. 紀元前 950年 (±900年)VEI 0地質学的推定
    BCE 950 ~ 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。