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在胡安·德福卡中海山脊上的轴心火山下面的岩储存

M West¹, W Menke, M Tolstoy

¹Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA. mwest@ldeo.columbia.edu

|October 26, 2001

概括

轴心火山拥有大型的岩系统,估计有521公里3,远远超过最近的喷发体积. 这表明火山是火山.

科学领域:

地质物理学地质物理学
火山学火山学是一门学科.
地震学地震学

背景情况:

轴火山是一个火山活动的海底山,靠近胡安·德·福卡山脊.
它与科布热点相关,并于1998年爆发.

研究的目的:

为了研究轴心火山下方的三维地震速度结构.
为了估计底层岩系统的体积和特征.

主要方法:

对地震学数据的分析.
地下速度结构的成像.

主要成果:

在地中确定了一个大型的低速度区域,包括一个浅的岩腔和一个更深的水库.
据估计,岩的总体积在5至21公里3.
这个数量比1998年爆发的融化量要大得多 (大小有两倍).

结论:

轴心火山的火山爆发只提取了总岩储存量的很小一部分.
岩系统可能相对于喷发周期而言寿命较长.
据估计,地的居住时间在几百年到几千年之间.

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