Dynamic rupture process of the 1999 Chi‐Chi, Taiwan, earthquake
Dynamic rupture process of the 1999 Chi‐Chi, Taiwan, earthquake
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DOI：
10.1029/2004gl019827
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发表时间：
2004-05
影响因子：
5.2
通讯作者：
Wenbo Zhang;T. Iwata;K. Irikura;A. Pitarka;H. Sekiguchi
中科院分区：
文献类型：
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作者：
Wenbo Zhang;T. Iwata;K. Irikura;A. Pitarka;H. Sekiguchi
基于3-D自发剪切裂纹模型，使用厚断层带模型和滑动弱化摩擦定律，研究了集集地震的动态破裂过程。结果表明，这次地震的动态破裂过程是非常复杂的。破裂开始时间的分布比运动学模型的分布更不均匀。我们发现，断裂面上具有较大强度过剩的区域延迟了破裂的传播。当遇到高强度过剩区时，破裂前缘从高强度过剩区跳跃到附近的低强度过剩区，留下未破裂区，随后破裂。我们还发现，上墙侧的运动大于脚墙侧的运动。
The dynamic rupture process of the Chi‐Chi earthquake has been investigated based on a 3‐D spontaneous shear crack model, using a thick fault zone model and a slip‐weakening friction law. Our results show that the dynamic rupture process of this event is very complex. The distribution of the rupture starting time is much more inhomogeneous than that of the kinematic model. We find that the zones with a large strength excess on the fault surface delay the rupture propagation. The rupture front jumps from the zones with high strength excess to the near zones with low strength excess when encounters the zones with high strength excess, leaving the unbroken zones behind which subsequently rupture. We also found that the motion on the hanging‐wall side is larger than that on the foot‐wall side.