The Poisson ratio and crustal structure across the NE Tibetan Plateau determined from receiver functions

	The Poisson ratio and crustal structure across the NE Tibetan Plateau determined from receiver functions
	Li Yong-Hua ; Wu Qing-Ju ; An Zhang-Hui ; Tian Xiao-Bo ; Zeng Rong-Sheng ; Zhang Rui-Qing ; Li Hong-Guang
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2006-09-01
卷号	49 期号:5 页码:1359-1368
关键词	the NE Tibetan Plateau receiver functions crustal structure Poisson ratio
ISSN号	0001-5733
文献子类	Article
英文摘要	We selected broadband teleseismic waveform data recorded by the Gansu Digital Seismic Network to study the crustal and upper mantle structure beneath the Northeastern Tibetan Plateau. The crustal thickness and V-p/V-S ratio are estimated by the grid-search method using crustal conversion and multiples, assuming an average P-wave velocity in the crust. Teleseismic P waveform modeling is carried out to investigate the S-wave velocity structure, assuming the fixed V-P/V-S value inferred from the grid-search method. Our results show that the crust is 50 similar to 55km thick beneath Qilian terrane, and about 45 km beneath the Hexi corridor and Qaidam. terrane. The V-P/V-S ranges from 1.66 similar to 1.85, and the Poisson's ratio is about 0.215 similar to 0.294. Our results also show that the Moho interface is sharp beneath the Northeastern Tibetan Plateau. Both of the low-to-normal Poisson's ratio and the sharp Moho don't support the argument of significant partial melting in the upper-to-middle crust and underplating beneath the lower crust of the Northeastern Tibet Plateau. The existence of anticorrelation between V-P / V-S and the crustal thickness strongly suggests that the crust, is mainly composed of felsic mineral in the northeastern Tibetan crust. The seismic evidence may indicate that the thickened crust, mostly in its upper part, is probably due to successive intracrustal thrusts.
WOS关键词	VELOCITY STRUCTURE ; QINGHAI ; BENEATH
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000240860700015
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/66970]
专题	中国科学院地质与地球物理研究所
通讯作者	Li Yong-Hua
作者单位	1.China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China 2.China Earthquake Adm, Lanzhou Inst Seismol, Lanzhou 730000, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Li Yong-Hua,Wu Qing-Ju,An Zhang-Hui,et al. The Poisson ratio and crustal structure across the NE Tibetan Plateau determined from receiver functions[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2006,49(5):1359-1368.
APA	Li Yong-Hua.,Wu Qing-Ju.,An Zhang-Hui.,Tian Xiao-Bo.,Zeng Rong-Sheng.,...&Li Hong-Guang.(2006).The Poisson ratio and crustal structure across the NE Tibetan Plateau determined from receiver functions.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,49(5),1359-1368.
MLA	Li Yong-Hua,et al."The Poisson ratio and crustal structure across the NE Tibetan Plateau determined from receiver functions".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 49.5(2006):1359-1368.