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

doi:10.1360/03dz0011

	Numerical simulations of deformation and movement of blocks within North China in response to 1976 Tangshan earthquake
	Bai, WM ; Lin, BH ; Chen, ZA
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2003-10-01
卷号	46 页码:141-+
关键词	discontinuous deformation analysis Tangshan earthquake deformation and movement of block
ISSN号	1006-9313
DOI	10.1360/03dz0011
文献子类	Article
英文摘要	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 raises the potential risk of earthquake occurrence. This result is supported by the facts that a series of Ms greater than or equal to 6 earthquakes took place at the northern margin of the Ordos block after the Tangshan earthquake.
WOS关键词	CRUSTAL DEFORMATION ; GPS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000186555200011
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/78495]
专题	中国科学院地质与地球物理研究所
通讯作者	Bai, WM
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.China Seismol Bur, Inst Geophys, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Bai, WM,Lin, BH,Chen, ZA. Numerical simulations of deformation and movement of blocks within North China in response to 1976 Tangshan earthquake[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2003,46:141-+.
APA	Bai, WM,Lin, BH,&Chen, ZA.(2003).Numerical simulations of deformation and movement of blocks within North China in response to 1976 Tangshan earthquake.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,46,141-+.
MLA	Bai, WM,et al."Numerical simulations of deformation and movement of blocks within North China in response to 1976 Tangshan earthquake".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 46(2003):141-+.