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Numerical Simulation of Earthquake Dynamic Rupture along Curved/ Branched fault Segments

沿弯曲/分支断层段地震动态破裂的数值模拟

基本信息

批准号：
15607020
负责人：
FUKUYAMA Eiichi
金额：
$ 1.86万
依托单位：
National Research Institute for Earth Science and Disaster Prevention
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15607020/
关键词：
Earthquake Rupture Dynamics Boundary Integral Equation Method Initial Stress Field Constitutive law for Earthquake Faulting 境界積分方程式方初期応用力場

项目摘要

We have conducted simulations of earthquake dynamic rupture on non-planar faults using boundary integral equation method. We found that in the simulation, fault geometry, shear stress applied on the fault and fault constitutive relation are important for the computation of dynamic rupture. Based on these information, we computed the dynamic ruptures of the 2000 western Tottori earthquake, 1891 Nobi earthquake, and 1995 Kobe earthquake. For the western Tottori earthquake, assuming the preexisting fault geometry and uniform constitutive relation, we estimated the stress field around the fault, which was found to be consistent with that estimated by the stress tensor inversion. For the Nobi earthquake there has been a debate whether the buried fault slipped during the earthquake or not. To accelerate the discussion, we conducted a dynamic rupture simulation using the preexisting fault geometry and found that whether or not the buried fault slipped depends on the connectivity to the adjacent fault. Finally, we investigated the Kobe earthquake. Using the fault geometry obtained, the rupture could not propagate bi-laterally. We found that to make a bi-lateral rupture, a small strike slip fault is required just beneath the Akashi trout, which was required by the inversion analysis with GPS data at Akashi bridge. In addition, using the near-fault seismograms observed at the western Tottori earthquake and the 2002 Denali, Alaska earthquake, we showed that the slip-weakening distance is size dependent.We organized two special sessions in 2004 and 2005 American Geophysical Union Fall Meeting. And we had more than 150 abstracts in total for these sessions. We recognized that this is one of the high-lighted topics that many people are interested in. We are now preparing a book to publish the major issues in the sessions.

本文用边界积分方程方法模拟了非平面断层上的地震动态破裂。我们发现，在模拟中，断层的几何形状，剪切应力施加到断层和断层本构关系是重要的动态破裂计算。根据这些信息，我们计算了2000年鸟取西部地震，1891年诺比地震和1995年科比地震的动态破裂。对于鸟取县西部地震，假设预先存在的断层几何形状和统一的本构关系，我们估计的应力场周围的断层，这是一致的估计的应力张量反演。对于Nobi地震，人们一直在争论地震期间埋藏的断层是否滑动。为了加快讨论，我们进行了一个动态破裂模拟使用预先存在的故障几何形状，并发现是否埋断层滑动取决于连接到相邻的故障。最后，我们调查了科比地震。使用得到的断层几何形状，破裂不能双向传播。我们发现，使一个双向破裂，一个小的走滑断层，需要在明石鳟鱼，这是需要在明石大桥的GPS数据的反演分析。另外，利用鸟取县西部地震和2002年阿拉斯加州德纳里地震的近断层地震记录，我们证明了滑动弱化距离与尺度有关。我们总共有150多篇论文摘要。我们认识到，这是许多人感兴趣的突出主题之一。我们现在正在编写一本书，以出版会议中的主要问题。