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首页> 外文期刊>Pure and Applied Geophysics >Guided Waves from Sources Outside Faults: An Indication for Shallow Fault Zone Structure?
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Guided Waves from Sources Outside Faults: An Indication for Shallow Fault Zone Structure?

机译：断层外部震源的导波：浅层断层带的指示？

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摘要

— Using 3-D numerical modeling of seismic wave propagation we investigate the possibility of generating fault zone (FZ) trapped wave energy from sources well outside a fault. The FZ is represented by a O(200 m) wide vertical low velocity layer in a half space. We find that FZ trapped waves can be excited from sources well outside the fault if (1) the low-velocity structure extemds only to shallow depth and the source is located at greater depth or (2) the structure of the low-velocity zone is such that only the shallow part of the FZ traps energy. FZ trapped waves are not excited from sources well outside a FZ continuous with depth. The results support, in conjunction with recent observational evidence, a model for natural faults with shallow trapping structures rather than ones that span the entire seismogenic zone. This may have implications for fault mechanics as well as for aspects of shaking hazard near faults.
机译：—使用地震波传播的3-D数值模型，我们研究了从断层外部的震源产生断层带（FZ）捕获波能量的可能性。 FZ由半空间中O（200 m）宽的垂直低速层表示。我们发现如果（1）低速结构仅延伸到浅层深度且震源位于更大的深度，或者（2）低速带的结构是断层之外，则FZ陷波可以从断层之外的源中激发出来。这样，只有FZ的浅层部分捕获能量。 FZ陷波不会从深度连续的FZ外部的源中激发出来。该结果与最新的观测证据一起，为具有浅层圈闭结构而不是跨越整个成地震带的自然断层模型提供了支持。这可能对故障力学以及故障附近的摇晃危险方面都有影响。

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  • 来源
    《Pure and Applied Geophysics》 |2004年第12期|2125-2137|共13页
  • 作者

    Miko Fohrmann; Heiner Igel; Gunnar Jahnke; Yehuda Ben-Zion;

  • 作者单位

    Department Earth and Environmental Sciences Ludwig-Maximilians-UniversityGeology Department University of Otago;

    Department Earth and Environmental Sciences Ludwig-Maximilians-University;

    Department Earth and Environmental Sciences Ludwig-Maximilians-UniversityBundesanstalt für Geowissenschaften und Rohstoffe;

    Department of Earth Sciences University of Southern California;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Wave propagation; fault zones; trapped waves; seismic hazard;

    机译：波传播;断层带;陷波;地震危险;

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