在一个活跃的低角度正常断层中,存在断层弱点和流体流动的证据
J S Floyd1, J C Mutter, A M Goodliffe
1Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA. jsfloyd@ldeo.columbia.edu
Nature
|July 19, 2001
概括
浅沉的正常断层可以很容易地滑落,因为蛇形岩断层和高流体压力. 这项研究揭示了木盆地的断层弱点机制,对于理解地延伸至关重要.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 结构地质学 结构地质学
背景情况:
- 浅沉的正常断层可以容纳显著的地延伸.
- 在低剪压下了解它们的滑动行为是关键.
研究的目的:
- 为了确定浅潜正常断层的组成和物理性质.
- 调查故障弱点和应变局部化的机制.
主要方法:
- 地震反射数据的基因算法反转.
- 分析地震速度和推断的多孔度.
主要成果:
- 确定了一个33米厚的蛇形岩断层在4-5公里深处.
- 观察到的低地震速度 (1.7公里/秒),表明孤立区域的高孔隙性和流体压力.
- 与6.2级地震相关的断层特性.
结论:
- 热水流体流和高延伸应力会产生断层弱点.
- 蛇形岩和高流体压力促进低角度正常断层的滑动.
- 这些发现与像木盆地这样的扩散中心的活跃构造学有关.
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