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| 3-D finite element modeling for evolution of stress field and interaction among strong earthquakes in Sichuan-Yunnan region | |
| 作者姓名： | 陈化然 陈连旺 马宏生 李轶群 张杰卿 何巧云 王建国 |
| 作者单位： | Earthquake Administration of Tianjin Municipality，Tianjin 300201，China，Institute of Crustal Dynamics，China Earthquake Administration，Beijing 100085，China，Institute of Earthquake Science，China Earthquake Administration，Beijing 100036，China，Earthquake Administration of Tianjin Municipality，Tianjin 300201，China，Earthquake Administration of Tianjin Municipality，Tianjin 300201，China，Earthquake Administration of Tianjin Municipality，Tianjin 300201，China，Earthquake Administration of Tianjin Municipality，Tianjin 300201，China |
| 基金项目： | State Key Basic Research Project (G1998040702) and Key Project of State Science and Technology during the tenth Five-year Plan (2001BA601B02-01-03). |
| 摘 要： | Introduction Sichuan-Yunnan region is a major area with frequent strong earthquakes in Chinese mainland, especially the middle-southern segment of South-North Seismic Zone, where many strong earth-quakes occurred in history. In the past 30 years, Sichuan-Yunnan region has two seismically active periods: one is from Tonghai earthquake in 1970 to Longling-Songpan earthquake in 1976, the other is from Lancang earthquake in 1988 to now. During this two periods, the M=7.7 Tonghai, M=7.1 Dagua… |
3-D finite element modeling for evolution of stress field and interaction among strong earthquakes in Sichuan-Yunnan region |
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| CHEN Hua-ran CHEN Lian-wang MA Hong-sheng LI Yi-qun ZHANG Jie-qing HE Qiao-yun WANG Jian-guo Earthquake Administration of Tianjin Municipality,Tianjin ,China Institute of Crustal Dynamics,China Earthquake Administration,Beijing ,China Institute of Earthquake Science,China Earthquake Administration,Beijing ,China.3-D finite element modeling for evolution of stress field and interaction among strong earthquakes in Sichuan-Yunnan region[J].Acta Seismologica Sinica(English Edition),2004,17(6). | |
| Authors: | CHEN Hua-ran CHEN Lian-wang MA Hong-sheng LI Yi-qun ZHANG Jie-qing HE Qiao-yun WANG Jian-guo Earthquake Administration of Tianjin Municipality Tianjin China Institute of Crustal Dynamics China Earthquake Administration Beijing China Institute of Earthquake Science China Earthquake Administration Beijing China |
| Institution: | 1. Earthquake Administration of Tianjin Municipality, Tianjin 300201, China 2. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China 3. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China |
| Abstract: | Based on the latest achievement about activities of geological structure, a 3-D finite-element model containing four layers of upper crust, lower crust (two layers) and upper mantle is established in the paper. By repeated tests and revisions, the boundary conditions of the model are determined. And then the background stress field, the stress field caused by fault creep and the stress field triggered by strong earthquake in Sichuan-Yunnan region, as well as their dynamic variations are calculated. The results indicate that the latter earthquake often occurs in the area with positive Coulomb rupture stress change associated with the former one, the former earthquake has a triggering effect on the latter one to a certain extent, and strong earthquake often occur in groups under the background of high stress, which is of great significance for distinguishing seismic anomalies, as well as for improving the level of earthquake prediction. |
| Keywords: | D finite element model background stress field stress field caused by fault creep stress field triggered by strong earthquake |
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