Direct estimation of rupture depths of earthquake faults from coseismic surface deformation

doi:10.1007/s11430-013-4814-z

	Direct estimation of rupture depths of earthquake faults from coseismic surface deformation
	Fu Zhen 4; Hu CaiBo 1; Zhang HaiMing 2; Xu HuiHui 2; Cai YongEn 2
刊名	SCIENCE CHINA-EARTH SCIENCES
	2014
卷号	57 期号:8 页码:1986-1994
关键词	surface deformation zero-strain points rupture depths dip angles of faults InSAR
ISSN号	1674-7313
DOI	10.1007/s11430-013-4814-z
英文摘要	The rupture dimensions of earthquake faults are important parameters for characterizing earthquake ruptures and ground motions. Two key parameters to be determined are the rupture depth and dip angle of earthquake faults. Dislocation theory in an elastic half space indicates that if a seismic rupture directly runs up to the ground surface, there exist zero points of horizontal strain in the surface deformation, which correspond to the rupture depths, except for pure strike-slip faults. In this study, we use numerical simulations to investigate the possibility of inferring rupture depths from zero-strain points for cases of buried faults and heterogeneous media. The results show that the correspondence of zero-strain points to the rupture depths can be influenced by the heterogeneity of the underground media and the stress field. For buried faults, the correspondence relationship is approximately valid when the fault depth is < 1 km. In addition, the range of earthquake fault dip angles can be estimated by horizontal displacements on the ground. We also study how to determine the rupture depths of faults from InSAR data after large earthquakes, and successfully apply the method to the 2008 Wenchuan earthquake. The method proposed here, which determines the parameters of fault geometry according to surface deformation, is simple and easy to perform. With independent of aftershocks, it can provide valuable constraints to kinematic inversions.
学科主题	构造地质学
WOS关键词	1999 CHI-CHI ; SLIP DISTRIBUTION ; WENCHUAN EARTHQUAKE ; TAIWAN EARTHQUAKE ; CHELUNGPU FAULT ; GEOMETRY ; DISPLACEMENTS ; PARAMETERS ; PLANE ; MODEL
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000339818800028
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41073]
专题	中国地质科学院
作者单位	1.Chinese Acad Geol Sci, Beijing 100037, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China 3.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China 4.中国地质科学院（院部）
推荐引用方式 GB/T 7714	Fu Zhen,Hu CaiBo,Zhang HaiMing,et al. Direct estimation of rupture depths of earthquake faults from coseismic surface deformation[J]. SCIENCE CHINA-EARTH SCIENCES,2014,57(8):1986-1994.
APA	Fu Zhen,Hu CaiBo,Zhang HaiMing,Xu HuiHui,&Cai YongEn.(2014).Direct estimation of rupture depths of earthquake faults from coseismic surface deformation.SCIENCE CHINA-EARTH SCIENCES,57(8),1986-1994.
MLA	Fu Zhen,et al."Direct estimation of rupture depths of earthquake faults from coseismic surface deformation".SCIENCE CHINA-EARTH SCIENCES 57.8(2014):1986-1994.