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Ceboruco

成層火山 · Mexico · 2280m

Volcán Ceboruco is a small, but complex stratovolcano with two concentric summit calderas. The thick lava flow (center) on the western flank was emplaced during an eruption in 1870-75. Eruption of the rhyodacite Jala Pumice formed the initial 4-km-wide caldera about 1,000 years ago. The second caldera was associated with partial collapse of the large Dos Equis dacite lava dome, which partly filled the earlier caldera. About 15 scoria cones and lava flows are across the flanks.
Volcán Ceboruco is a small, but complex stratovolcano with two concentric summit calderas. The thick lava flow (center) on the western flank was emplaced during an eruption in 1870-75. Eruption of the rhyodacite Jala Pumice formed the initial 4-km-wide caldera about 1,000 years ago. The second caldera was associated with partial collapse of the large Dos Equis dacite lava dome, which partly filled the earlier caldera. About 15 scoria cones and lava flows are across the flanks. · 写真: Photo by Jim Luhr, 1980 (Smithsonian Institution). · Wikimedia Commons
タイプ
成層火山
国
Mexico
地域
Middle America-Caribbean Volcanic Regions / Trans-Mexican Volcanic Arc
標高
2280m
座標
21.125, -104.508
最終噴火
1875年
テクトニクス環境
Subduction zone / Continental crust (> 25 km)
火山地形
Composite
主要岩石
Andesite / Basaltic Andesite
地質学的概要

Volcán Ceboruco is the only volcano in the NW part of the Mexican Volcanic Belt with observed eruptions. The complex stratovolcano rises above the floor of the Tepic graben and is truncated by two concentric summit calderas. Eruption of the voluminous rhyodacitic Jala Pumice formed the initial 4-km-wide caldera about 1,000 years ago. The second caldera, 1.5 km wide, was formed by collapse of part of the large Dos Equis dacitic lava dome, which partly filled the earlier caldera. About 15 basaltic and andesitic cinder cones and lava flows have erupted along a NW-SE-trending line cutting across Ceboruco. The massive, sparsely vegetated El Norte lava flow, probably erupted in the past few hundred years, covers the entire N flank. The last eruption took place during 1870-1875 CE. Explosive eruptions from a vent on the upper W flank accompanied extrusion of a 1.1 km3 dacitic lava flow that covers a large area on the lower W flank.

Wikipedia の要約

英語版の要約

Ceboruco is a dacitic stratovolcano located in Nayarit, Mexico, northwest of the Trans-Mexican Volcanic Belt. The largest eruption, the Jala Plinian eruption, was around 930 AD ±200, VEI 6, releasing 11 cubic kilometres (2.6 cu mi) of tephra. The most recent and best documented eruption from Ceboruco lasted from 1870–1875, with fumarole activity lasting well into the 20th century. The mountain features one large caldera, created during the Jala eruption, with a smaller crater nested inside that formed when the Dos Equis lava dome collapsed during the Coapales eruption around 1100 AD. Within both of these craters, are several explosive volcanic features, including scoria deposits, lava domes, and pyroclastic domes, or cinder cone volcanoes.

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噴火履歴

概要 (VEI時系列)
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930~1024 · 1件 · 最大 VEI 61494~1588 · 2件 · 最大 VEI ?1776~1870 · 1件 · 最大 VEI 39301118140015881776

詳細タイムライン

  1. 1870年VEI 3観測記録
    1870-02-21 ~ 1875
    Upper west flank
  2. 1567年VEI ?観測記録
    1567 ~ 進行中
  3. 1542年VEI ?観測記録
    1542 ~ 進行中
  4. 930年 (±200年)VEI 6地質学的推定
    930 ~ 進行中

外部リンク

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