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A new waveform inversion method to determine the rupture directivity of moderate earthquakes: numerical tests for rupture models

机译：确定中地震破裂指向性的新波形反演方法：破裂模型的数值试验

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摘要

Rupture directivity is the important parameter in estimating damage due to earthquakes. However, the traditional moment tensor inversion technique cannot resolve the real fault plane or the rupture directivity. To overcome these limitations, we have developed a new inversion algorithm to determine the moment tensor solution and the rupture directivity formoderate earthquakes, using the waveform inversion technique in the frequency domain. Numerical experiments for unilateral and bilateral rupture models with various rupture velocities confirm that the method can resolve the ambiguity of the fault planes and the rupture directivity successfully. To verify the feasibility of the technique, we tested the sensitivity to velocity models, which must be the most critical factor in practice. The results of the sensitivity tests show that the method can be applied even though the velocity model is not perfect. If this method is applied in regions where the velocity model is well verified, we can estimate the rupture directivity of a moderate earthquake. This method makes a significant contribution to understanding the characteristics of earthquakes in those regions.
机译：破裂方向性是估算地震破坏的重要参数。然而，传统的矩张量反演技术无法解析实际的断层或破裂方向性。为了克服这些限制，我们开发了一种新的反演算法，使用频域中的波形反演技术来确定中度地震的矩张量解和破裂方向性。对具有不同破裂速度的单侧和双侧破裂模型的数值实验证实，该方法能够成功解决断层平面的歧义性和破裂方向性。为了验证该技术的可行性，我们测试了对速度模型的敏感性，这在实践中必须是最关键的因素。灵敏度测试的结果表明，即使速度模型不是完美的，该方法也可以应用。如果将该方法应用于速度模型得到很好验证的区域，我们可以估计中度地震的破裂指向性。该方法为理解这些地区的地震特征做出了重要贡献。

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  • 来源
    《Exploration Geophysics》 |2009年第1期|114-120|共7页
  • 作者

    Seung-Hoon Yoo; Junkee Rhie;

  • 作者单位

    School of Earth and Environmental Science, Seoul National University, Seoul, South Korea;

    School of Earth and Environmental Science, Seoul National University, Seoul, South Korea;

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