Mechanism of postseismic deformation of ground surface following the;1999 Chi-Chi earthquake, Taiwan

doi:10.6038/cjg20130817

	Mechanism of postseismic deformation of ground surface following the;1999 Chi-Chi earthquake, Taiwan
	Fu Zhen 3; Zhang Hai-Ming ; Cai Yong-En
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2013
卷号	56 期号:8 页码:2681-2689
关键词	Chi-Chi earthquake Viscous relaxation Postseismic deformation GPS data LDDA method
ISSN号	0001-5733
DOI	10.6038/cjg20130817
英文摘要	GPS measurements of 450 days after the 1999 Chi-Chi, Taiwan, earthquake revealed large postseismic displacement from dozens to hundreds of millimeters. Two possible mechanisms responsible for the postseismic deformation of the surface are the viscous relaxation of the lower crust and the afterslip caused by the aseismic creep of the earthquake fault. In this study, the finite element method (LDDA) for the viscoelastic contact problems is used to simulate the postseismic deformation process of the 1999 Chi-Chi earthquake with the GPS data as constraints. And the two possible mechanisms, viscous relaxation and afterslip, are discussed. The results indicate that the postseismic deformation observed by GPS can be well explained by the viscous relaxation mechanism. The viscosity of the lower crust below the Taiwan area is estimated as 10(17) Pa . s by the trial and error method. The effect of afterslip mechanism on the postseismic deformation of the Chi-Chi earthquake is investigated by the numerical method with rate-and-state dependent frictional law. The results suggest that the GPS data cannot be explained by the afterslip mechanism alone, which only affects the postseismic deformation in the early 50 days after the mainshock. These studies will throw light on understanding the mechanism of the postseismic deformation of the 1999 Chi-Chi, Taiwan, earthquake.
学科主题	地震地质学
WOS关键词	LANDERS EARTHQUAKE ; FRICTIONAL SLIP ; AFTERSLIP ; CRUST ; INSTABILITY ; CALIFORNIA ; MANTLE ; LAWS
WOS研究方向	Geochemistry & Geophysics
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000323854200017
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40229]
专题	中国地质科学院
作者单位	1.Chinese Acad Geol Sci, Beijing 100037, Peoples R China. 2.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. 3.中国地质科学院（院部）
推荐引用方式 GB/T 7714	Fu Zhen,Zhang Hai-Ming,Cai Yong-En. Mechanism of postseismic deformation of ground surface following the;1999 Chi-Chi earthquake, Taiwan[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2013,56(8):2681-2689.
APA	Fu Zhen,Zhang Hai-Ming,&Cai Yong-En.(2013).Mechanism of postseismic deformation of ground surface following the;1999 Chi-Chi earthquake, Taiwan.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,56(8),2681-2689.
MLA	Fu Zhen,et al."Mechanism of postseismic deformation of ground surface following the;1999 Chi-Chi earthquake, Taiwan".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 56.8(2013):2681-2689.