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首页> 外文会议>Innovation, practice, safety >SOURCE MODELING OF RECENT LARGE INLAND CRUSTAL EARTHQUAKES IN JAPAN AND SOURCE CHARACTERIZATION FOR STRONG MOTION PREDICTION
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SOURCE MODELING OF RECENT LARGE INLAND CRUSTAL EARTHQUAKES IN JAPAN AND SOURCE CHARACTERIZATION FOR STRONG MOTION PREDICTION

机译：日本近期内陆地壳地震的震源模拟及强运动预测的震源特征

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Dense strong motion observation networks provided us valuable data for studying strong motion generation from large earthquakes. In recent years, several large earthquakes occurred in Japan, and a large amount of strong motion data is recorded. It is important for advancement of source modeling in scenario-based strong motion prediction to quantify detailed source characteristics of past earthquakes. We have estimated the source rupture process of these earthquakes by the kinematic waveform inversion using strong motion data. The asperity, where slip is relatively large compared to average slip over the fault, is quantified following the criteria proposed by Somerville et al. (1999). The stress changes during these earthquakes are cestimated from the detailed slip distributions obtained by the kinematic waveform inversion. The stress drops on and off asperities are characterized based on the stress change distributions obtained here. The stress drop on asperity is one of key parameters in source modeling, because stress drop is related to slip velocity of the source fault and associated ground motion. We compiled the stress drop on the asperities together with data set of previous studies for other inland earthquakes in Japan and others. The static stress drop on asperity depends on its depth,and we obtained an empirical relationship between static stress drop and asperity's depth. Moreover, surface breaking asperities appeared to have smaller stress drop than buried asperities.
机译：密集的强运动观测网络为研究大地震产生的强运动提供了宝贵的数据。近年来，日本发生了几次大地震，并记录了大量的强运动数据。在基于情景的强运动预测中，量化震源的详细震源特征对于震源模型的发展非常重要。我们使用强运动数据通过运动波形反演估算了这些地震的震源破裂过程。与断层上的平均滑移相比，滑移相对较大的不平整度是根据Somerville等人提出的标准量化的。 （1999）。根据运动波形反演获得的详细滑动分布，可以确定这些地震期间的应力变化。基于此处获得的应力变化分布来表征凹凸不平的应力降。凹凸不平的应力下降是震源建模的关键参数之一，因为应力下降与震源断层的滑动速度和相关的地震动有关。我们汇总了有关凹凸不平的应力下降以及先前针对日本其他内陆地震和其他地区的研究的数据集。粗糙表面上的静应力下降取决于其深度，我们获得了静应力下降与粗糙深度之间的经验关系。而且，表面破裂的凹凸似乎比埋入的凹凸具有较小的应力降。

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