| Numerical simulation for 1975 Haicheng and 1999 Xiuyan earthquake processes by DDA+FEM |
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| 作者姓名： | 张瑞青 魏富胜 乔成斌 林邦慧 |
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| 作者单位： | Institute of Geophysics，China Earthquake Administration，Beijing 100081，China，Institute of Geophysics，China Earthquake Administration，Beijing 100081，China，China Center for Earthquake Disaster Emergency Search and Rescue，Beijing100049，China，Institute of Geophysics，China Earthquake Administration，Beijing 100081，China |
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| 基金项目： | National Natural Science Foundation of China (40174011 and 40274029). |
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| 摘 要： | Introduction The Xiuyan earthquake(MS=5.4)on Nov.29,1999,occurred between Hushan town and Pi-anling town at the southeast end of the aftershocks of Haicheng earthquake(MS=7.3).These two earthquakes′sequences are highly similar in the way that the foreshocks are very frequent,focal mechanisms of the main shocks are about the same and fault strikes are approximately in the same direction.It is important to study these earthquakes for further research on seismogenesis to fore-cast earthquake…
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| 收稿时间： | 21 October 2003 |
| 修稿时间： | 17 September 2004 |
Numerical simulation for 1975 Haicheng and 1999 Xiuyan earthquake processes by DDA+FEM |
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| ZHANG Rui-qing,Wei Fu-sheng,QIAO Cheng-bin,LIN Bang-hui.Numerical simulation for 1975 Haicheng and 1999 Xiuyan earthquake processes by DDA+FEM[J].Acta Seismologica Sinica(English Edition),2005,18(2):171-179. |
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| Authors: | ZHANG Rui-qing Wei Fu-sheng QIAO Cheng-bin LIN Bang-hui |
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| Institution: | 1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2. China Center for Earthquake Disaster Emergency Search and Rescue, Beijing 100049, China |
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| Abstract: | In this paper, using discontinuous deformation analysis, we simulate numerically the processes of the 1975 Ha- icheng earthquake and the 1999 Xiuyan earthquake in the tectonic environment of North China where blocks re- strict each other by DDA+FEM. Based on the research on the distribution of foreshocks and recent aftershocks of Xiuyan earthquake and the results from our study and other study on Haicheng earthquake, we present a tectonic block model of Haicheng and Xiuyan earthquakes. The results from numerical simulation include the variation of principal stress field released by these two earthquakes, contour patterns of maximum shear stress change, varia- tion patterns of displacement vectors before and after the earthquakes and variation of the earthquake fault slip with time, which agree basically with the focal mechanisms, macroscopic isoseismal and horizontal displacement characters from observations. |
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| Keywords: | discontinuous deformation analysis numerical simulation rupture processes of earthquake |
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