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Numerical simulations of deformation and movement of blocks within North China in response to 1976 Tangshan earthquake

Numerical simulations of deformation and movement of blocks within North China in response to 1976 Tangshan earthquake

作     者:BAI Wuming (白武明) LIN Banghui (林邦慧) CHEN Zu'an (陈祖安) 

作者机构:Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Institute of Geophysics China Seismological Bureau Beijing 100081 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China 

出 版 物:《Science China Earth Sciences》 (中国科学(地球科学英文版))

年 卷 期:2003年第46卷第z2期

页      面:141-152页

核心收录:

学科分类:070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基  金:国家重点基础研究发展计划(973计划)(G1998040704) 

主  题:discontinuous deformation analysis, Tangshan earthquake, deformation and movement of block. 

摘      要:Using methods of discontinuous deformation analysis and finite element (DDA+FEM), this paper simulates dynamic processes of the Tangshan earthquake of 1976, which occurred in the northern North China where its internal blocks apparently interacted. Studies focus upon both the movement and deformation of the blocks, in particular, the Ordos block, and variations of stress states on the boundary faults. The Tangshan earthquake was composed of three events: slipping motions of NNE-striking major fault, NE-striking fault near the northeastern end of the NNE-striking fault, and NW-striking fault on the southeastern side of the NNE-striking fault. Compared with previous studies, our model yields a result that is more agreeable with the configuration of aftershock distributions. A number of data are presented, such as the principle stress field during the earthquake, contours of the maximum shear stress, the strike-slip deformation between blocks near the earthquake focus, time-dependent variations of slips of earthquake-triggered faulting, the maximum slip distance, and stress drops. These results are in accord with the earthquake source mechanism, basic parameters from earthquake wave study, macro-isoseismic line, observed horizontal displacement vectors, etc. The Tangshan earthquake exerted different influences on the adjacent blocks and boundary faults between them, thus resulting in differential movement and deformation. The Ordos block seems to have experienced the small-scale counterclockwise rotation and deformation, but its northeast part, bounded on the east by the Taihangshan and on the north by the Yanshan and Yinshan belts, underwent relatively stronger deformation. The Tangshan earthquake also changed the stress state of boundary faults of the North China, leading to an increase in shear stress and a decrease in normal stress in the NW-trending Zhangjiakou-Penglai fault through Tangshan City and the northern border faults of the Ordos block, and therefore rai

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