| Characteristics of a Short-Term and Imminent Earthquake Precursor Field in the Northern Part of North China and Numerical Simulation of Source Process |
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| 作者姓名： | Zhang Guomin Shi Yaolin and Zhang YongxianCenter for Analysis and Prediction SSB Beijing P.R. China Graduate School Academia Sinica Beijing P.R. China |
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| 作者单位： | Zhang Guomin，Shi Yaolin，and Zhang YongxianCenter for Analysis and Prediction，SSB，Beijing 100036，P.R. China Graduate School，Academia Sinica，Beijing 100039，P.R. China |
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| 摘 要： | According to studies of more than 20 earthquakes with MS≥5.0 in North China, seven features of the short-term and imminent earthquake precursors have been summarized in this paper. At the same time, taking the short-term and imminent earthquake stage as the physical process of a source's medium softening and fault creep, we calculated temporal variation of mean stress, maximum shear stress, body strain, and pore pressure in some certain points (supposed stations) in the source area and its adjacent area by using an anisotropic and nonlinear source model and a finite element method. According to an analysis of these theoretical curves, we conclude that the short-term and imminent earthquake precursors have such characteristics as complex shapes, exponential growth of the precursor number with tune, and precursors' migration from the outside area to the source area, which to a certain extent reveal the cause of the characteristics of the short-term and imminent earthquake precursor field.
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Characteristics of a Short-Term and Imminent Earthquake Precursor Field in the Northern Part of North China and Numerical Simulation of Source Process |
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| Zhang Guomin,Shi Yaolin,and Zhang YongxianCenter for Analysis and Prediction,SSB,Beijing ,P.R. China Graduate School,Academia Sinica,Beijing ,P.R. China.Characteristics of a Short-Term and Imminent Earthquake Precursor Field in the Northern Part of North China and Numerical Simulation of Source Process[J].Earthquake Research in China,1996(2). |
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| Authors: | Zhang Guomin Shi Yaolin and Zhang YongxianCenter for Analysis and Prediction SSB Beijing PR China Graduate School Academia Sinica Beijing PR China |
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| Institution: | Zhang Guomin,Shi Yaolin,and Zhang YongxianCenter for Analysis and Prediction,SSB,Beijing 100036,P.R. China Graduate School,Academia Sinica,Beijing 100039,P.R. China |
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| Abstract: | |
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| Keywords: | Numerical simulation Source process Impending earthquake anomaly Northern part of North China |
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