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マルチェナ島

Marchena

楯状火山 · Ecuador · 343m

A large tuff cone rises near Punta Calle on the southern coast of Marchena Island beyond fresh-looking lava flows west of the cone in the foreground. The low shield volcano forming Marchena Island contains one of the largest calderas of the Galápagos Islands. In contrast to other Galápagos volcanoes, the 6 x 7 km caldera and its outer flanks have been largely buried by a cluster of pyroclastic cones and associated lava flows. The first historical eruption of Marchena occurred in 1991.
A large tuff cone rises near Punta Calle on the southern coast of Marchena Island beyond fresh-looking lava flows west of the cone in the foreground. The low shield volcano forming Marchena Island contains one of the largest calderas of the Galápagos Islands. In contrast to other Galápagos volcanoes, the 6 x 7 km caldera and its outer flanks have been largely buried by a cluster of pyroclastic cones and associated lava flows. The first historical eruption of Marchena occurred in 1991. · 写真: Photo by Ed Vicenzi, 1984 (Smithsonian Institution). · Wikimedia Commons
タイプ
楯状火山
国
Ecuador
地域
Eastern Pacific Volcanic Regions / Northern Galapagos Volcanic Province
標高
343m
座標
0.330, -90.470
最終噴火
1991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

The low shield volcano forming Marchena Island contains one of the largest calderas of the Galápagos Islands. The 6 x 7 km caldera and its outer flanks have been largely buried by a cluster of pyroclastic cones and associated lava flows. Its first historical eruption occurred in 1991. Other young lava flows, some of which may be only a few thousand, or even a few hundred years old, filled the caldera and flowed down its outer forested flanks, in some cases to the sea.

Wikipedia の要約

英語版の要約

Marchena Island is one of the Galapagos Islands in Ecuador. It has an area of 130 square kilometers (50 sq mi) and reaches an elevation of 343 meters (1,125 ft) above sea level. The island does not receive visitors, although the surrounding water is used by aquatic divers on organized tours. People generally see the island as they sail around the northern part of Isabela on the way to Genovesa Island.

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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
1991~1991 · 1件 · 最大 VEI 219911991199219921992

詳細タイムライン

  1. 1991年VEI 2観測記録
    1991-09-25 ~ 1991-11-16
    West to SW caldera rim

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。