| 2001年8.1级昆仑山大震破裂过程及对2008年汶川8.0级大震孕育发生影响的研究 |
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| 引用本文： | 陈祖安,林邦慧,白武明,程旭,王运生.2001年8.1级昆仑山大震破裂过程及对2008年汶川8.0级大震孕育发生影响的研究[J].地球物理学报,2011,54(1):108-120. |
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| 作者姓名： | 陈祖安 林邦慧 白武明 程旭 王运生 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所地球深部研究重点实验室, 北京 100029;
2. 中国地震局地球物理研究所, 北京 100081;
3. 成都理工大学地质灾害防治与地质环境保护国家重点实验室, 成都 610059 |
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| 基金项目： | 国家自然科学基金项目，地质灾害防治与地质环境保护国家重点实验室(成都理工大学)项目 |
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| 摘 要： | 本文用三维流变非连续变形(块体边界)与有限元(块体内)相结合(DDA+FEM)的方法,在青藏高原及其东侧四川盆地,鄂尔多斯块体地区三维构造块体相互制约的大环境中,考虑了龙门山断裂带东西两侧地势、地壳厚度和分层的明显变化,及断裂带东侧四川盆地及鄂尔多斯块体坚硬地壳阻挡的影响,通过用GPS资料做位移速率边界约束和震源机制约...
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| 关 键 词： | 昆仑山大震 汶川大震 构造块体 数值模拟 破裂过程 |
| 收稿时间： | 2010-04-15 |
A study on the rupture process of the 2001 Ms8.1 Kunlunshan earthquake and its influence on pregnant process and occurrence of the Ms8.0 Wenchuan earthquake in 2008 |
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| CHEN Zu-An,LIN Bang-Hui,BAI Wu-Ming,CHENG Xu,WANG Yun-Sheng.A study on the rupture process of the 2001 Ms8.1 Kunlunshan earthquake and its influence on pregnant process and occurrence of the Ms8.0 Wenchuan earthquake in 2008[J].Chinese Journal of Geophysics,2011,54(1):108-120. |
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| Authors: | CHEN Zu-An LIN Bang-Hui BAI Wu-Ming CHENG Xu WANG Yun-Sheng |
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| Institution: | 1. Key Laboratory of the Study of Earth's Deep Interior, Institute of Geology and Geophysics, The Chinese Academy of Sciences, Beijing 100029, China;
2. Institute of Geophysics, Chinese Seismological Bureau, Beijing 100081, China;
3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | In this paper, 3D Finite Element Method combined with Discontinuous Deformation Analysis is used to firstly calculate velocity and stress fields of the Qingzang Plateau in the framework of northward compression of the Indian Plate and obstruction of the strong crust of Sichuan basin, with constraints from GPS data and focal mechanism. Then we simulated the rupture process of the Kunlunshan Ms8.1 earthquake in 2001, and studied the characteristics of stress change on the boundary faults of tectonic blocks caused by the earthquake, especially the influence on the seismogenic fault of the Wenchuan earthquake in 2008. The results show that (1) the Kunlunshan earthquake undergoes sinistral strike-slip movement, the calculated maximum horizontal dislocation of the seismogenic fault is 4.5 m, and the calculated maximum stress drop is 18 MPa. The distribution of principal compressive stress change, the contour map of maximum shear stress change before and after Kunlunshan earthquake, the 3D distribution of the vertical displacement caused by the earthquake acquired via calculation are totally in agreement with the focal mechanism solution, the coseismic displacement distribution on the rupture zone of the earthquake. (2) The maximum shear stress variation on the north and south sides of the seismogenic fault is asymmetrical, with the stress change gradient on the south side much greater than that on the north side. (3) We find that the Kunlunshan earthquake caused the coulomb failure stress increase 0.016 MPa (upper crust) on the seismogenic fault of the 2008 Wenchuan earthquake. The rupture process of Kunlunshan earthquake, a sinistral strike-slip movement on the seismic fault of eastern Kunlun fracture zone, caused Bayankala block at southern side of eastern Kunlun fracture zone to extend further to east and deform to a certain extent. Meanwhile, the obstruction of stronger crust in Sichuan basin at eastern side of Bayankala block made the Coulomb failure stress increase and strain energy accumulation strengthen, on seismic fault of Wenchuan earthquake with low dip angle at eastern boundary of the block. Therefore, the occurrence of the Kunlunshan earthquake has played a role of promoting the generation and instability of the seismogenic fault of the Wenchuan earthquake. |
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| Keywords: | Kunlunshan earthquake Wenchuan earthquake Tectonic block Numerical simulation Rupture process |
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