| 唐山地震孕震过程的三维有限元分析及其在地震预报研究上的意义 |
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| 引用本文： | 朱岳清,梅世蓉,梁北援.唐山地震孕震过程的三维有限元分析及其在地震预报研究上的意义[J].地球物理学报,1988,31(4):399-409. |
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| 作者姓名： | 朱岳清 梅世蓉 梁北援 |
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| 作者单位： | 国家地震局分析预报中心 北京 |
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| 摘 要： | 本文分析了唐山地震孕震过程的物理力学特征。首先分析孕震体的物理性状及其所处的力学环境,认为孕震体承受着一个力系的作用,提出了唐山地震孕震的物理力学模型。接着以有限元方法对孕震过程进行三维力学分析,注意尽可能应用地球物理观测资料或其反演结果,以便适当确定模型的边界条件与物理参数。文中认为摩擦滑动破坏的机制比较符合实际地震情况,提出摩擦破坏危险度Fs 是否大于1.0来识别破裂危险点。还具体分析了唐山地震的破裂特征,并对分析方法与结果在预报上的意义进行了讨论。
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| 关 键 词： | 孕震过程 有限元方法 地震预报 |
| 收稿时间： | 1986-05-02 |
THE 3-D FINITE ELEMENT ANALYSIS ON THE PREGNANT PROCESS OF TANGSHAN EARTHQUAKE AND ITS SIGNIFICANCE TO THE EARTHQUAKE PREDICTION STUDY |
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| ZHU YUE-QING MEI SHI-RONO LIANG BEI-YANG.THE 3-D FINITE ELEMENT ANALYSIS ON THE PREGNANT PROCESS OF TANGSHAN EARTHQUAKE AND ITS SIGNIFICANCE TO THE EARTHQUAKE PREDICTION STUDY[J].Chinese Journal of Geophysics,1988,31(4):399-409. |
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| Authors: | ZHU YUE-QING MEI SHI-RONO LIANG BEI-YANG |
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| Institution: | Centre for Analysis and Prediction, State Seismological Bureau. Beijing |
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| Abstract: | In this paper we have studied the physical and mechanical features of pregnant process cf Tangshan earthquake. We analysed the physical characteristics of the pregnant body and its environment, and considered that the body is under the actions of an external force system. We suggest a pregnant physical mechanical model for Tangshan earthquake. Subse-quentely we carry out 3-D mechanical analysis on the pregnant process by using finite element method. We have applied the geophysical measurement data or its reversional results to ascertain the boundary conditions and the physical paramenters of the model medium. Considering that the real model is not a homogeneous one, we think that the friction-slip failure mechanism is suited to real shock-failure situation. Basing on the Byerlee's experience rule we suggested the conception of risk degree of frictional fracturing Fs and used it to cognize the earthquake failure dangerous points. We took Fs≥1.0 as the failure criterion. At last, we have done a concrete analysis on the failure characteristics of Tangshan earthquake, and discussed the significance of this study and its results to earthquake prediction. |
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| Keywords: | Pregnant process Finite element method Earthquake prediction |
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