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Design Ground Motion for Lifeline System Taking into AccountFault Rupture Process

考虑断层破裂过程的生命线系统地面运动设计

基本信息

批准号：
62550336
负责人：
SATO Tadanobu
金额：
$ 1.34万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

The cepstrum analysis was applied to deconvolute a seismec wave into a system response function and a train of impulses. Based on several criteria to minimize error, we propose a method to identify the source mechanism using identified trains of impulses. Simulated waves were anakyzed in order to examine the validity of the proposd decomvolution method. It was found that arrival time of an impulse was estimated within teh error of two sampling intervals and intensity of impulse was proportional to the difference between the exact and estimated arrival time of the impulse.The accelerograms recorded at fourteen stations in El Centro Array are used to identify the fault mechanism of the 1979 Imperial Valley, California earthquake. The rupture velocity, the starting point of rupture, the direction of the rupture propagation and the rise tiome can be estimated by minimizing the error between deconvoluted trains of impulses and theoretically calculated ones by selecting proper values of fault parameters in the rupture process. The multiple rupture process was confirmed by the fact that five major small events were identified on the fault surface.The identifide distribution of seismic moment on the fault surface compares well with that investigated from different approach. The analytical algorithm led to the nonlinear system inversion and non-uniqueness of identified parameters. To overcome these problems, we applied Bayes' rule which provided a quantitative error measure taking into account the effect of prior informartion for identfying parameters.

利用倒谱分析将地震波分解为系统响应函数和脉冲序列。基于几个最小化误差的准则，我们提出了一种利用识别的脉冲序列来识别源机制的方法。为了验证所提出的反褶积方法的有效性，对模拟波进行了分析。结果表明，脉冲到达时间的估计误差在两个采样间隔的误差范围内，脉冲强度与脉冲到达时间的精确值和估计值之差成正比。利用El Centro阵列14个台站记录的地震加速度图识别1979年加州帝国谷地震的断层机制。通过选择合适的破裂过程中的断层参数，使解卷后的脉冲序列与理论计算值之间的误差最小，可以估计破裂速度、破裂起点、破裂传播方向和上升速度。在断裂面上识别出5个较大的小震，证实了断裂面的多次破裂过程，识别出的地震矩在断裂面上的分布与从不同角度研究的结果吻合较好。这种解析算法导致了系统的非线性逆和辨识参数的不唯一性。为了克服这些问题，我们应用了贝叶斯规则，该规则提供了一种量化误差度量，考虑了先验信息对参数识别的影响。