地震动模拟过程中断层参数的敏感性分析
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地震行业科研专项(201308013)


Sensitivity Analysis of Fault Parameters during Ground Motion Simulation
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    摘要:

    地震发生后通常无法快速获取较准确的断层参数,这可能会对采用地震动模拟方法进行地震动强度快速评估产生影响。选取美国西部两次地震,采用两种地震动模拟方法,通过改变断层走向、滑移角、倾角和震源深度等主要断层参数进行模拟计算,分析不同参数对地震动参数和反应谱值的影响以及不同方法计算结果的准确性。结果表明:GP方法模拟的结果比EXSIM方法更接近观测值;在参数误差范围内,相比于模拟方法本身的误差,各参数对模拟结果的影响较小,地震动强度快速评估时可以利用较合理的快速反演断层参数进行地震动模拟。

    Abstract:

    It is not usually possible to obtain accurate fault parameters after an earthquake,and this has a negative effect on the ability to make a rapid assessment of ground motion intensity after an earthquake when using a ground motion simulation method.Two earthquakes that occurred in western USA were selected for simulation using two different methods.Parameters such as strike,rake,dip,and focal depth were varied and the influence of the different fault parameters on the ground motion intensity index and value of response spectra were analyzed,and the accuracy of the different methods was determined.Results of simulations show that the GP method provides values that are closer to observed values than the EXSIM method.In comparison with the errors caused by the simulation methods,the influence of fault parameters on the simulated results is small within a reasonable error range of different fault parameters.It is thus considered that fault parameters through rapid inversion can be used in ground motion simulation for a rapid assessment of seismic intensity.

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王德才,何骁慧.地震动模拟过程中断层参数的敏感性分析[J].地震工程学报,2016,38(2):212-218. WANG De-cai, HE Xiao-hui. Sensitivity Analysis of Fault Parameters during Ground Motion Simulation[J]. China Earthquake Engineering Journal,2016,38(2):212-218.

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  • 收稿日期:2015-03-23
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  • 在线发布日期: 2016-05-20