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在加利福尼亚州广泛触发非火山性震动

Joan Gomberg¹, Justin L Rubinstein, Zhigang Peng

¹U.S. Geological Survey, Box 351310, Seattle, WA 98195, USA. gomberg@usgs.gov

Science (New York, N.Y.)

|November 24, 2007

概括

非火山性震动,以前认为只发生在俯冲区,是由一个遥远的地震在加利福尼亚州触发. 这一发现扩大了已知可以发生震动的构造环境.

科学领域:

* 固体地球地质物理学
* 构造物理学构造物理学

背景情况:

*非火山震动是一种地震现象,通常与俯冲区有关.
*现有的震荡模型通常需要高温和流体压力,这些条件被认为是潜伏环境中独有的.
*以前的研究主要记录在潜伏区域内发生的震.

研究的目的:

* 在转换板边界设置中调查非火山震动的发生.
* 为了确定在不同的构造环境中,遥远的地震事件是否会引发震动.
*通过检查非潜伏设置中的震动来挑战现有的震动生成模型.

主要方法:

*确定了加利福尼亚变形板边界附近的七个位置.
*分析了地震数据,以检测2002年德纳利地震引发的非火山震动.
* 与断层特征 (爬行与锁定) 和构造环境相关的震发生.

主要成果:

* 2002年德纳利地震在加利福尼亚州的转变板边界或附近的七个地点成功触发了非火山性震动.
* 在这种转换设置中出现震动表明,产生震动的条件并不仅限于俯冲区域.
* 震动发生与爬行或锁定断层之间没有发现相关性,这与一些摩擦模型的预测相矛盾.

结论:

*这些发现扩大了对有利于非火山震动的构造环境的理解.
*目前的震动模型可能需要修订,以考虑超出俯冲区的环境中震动的产生.
*这项研究表明,除了通常与俯冲区相关的因素之外,如高温和流体压力,其他因素可能对震产生至关重要.

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