Crust-mantle velocity structure of S wave and dynamic process beneath Burma Arc and its adjacent regions

	Crust-mantle velocity structure of S wave and dynamic process beneath Burma Arc and its adjacent regions
	Hu Jia-Fu 1; Hu Yi-Li 1; Xia Jing-Yu 1; Chen Yun 2; Zhao Hong 1; Yang Hai-Yan 1
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2008
卷号	51 期号:1 页码:140-148
关键词	Burma Arc S wave velocity dynamic process subducted slab
ISSN号	0001-5733
文献子类	Article
英文摘要	The Rayleigh dispersion data of 530 selected paths crossing Burma Arc and its adjacent regions are determined by applying the MF-FTAN (Matched-Filter Frequency-Time Analysis) technique to long period data recorded at SHIO, CHTO, KMI, and LSA stations, the periods of the Rayleigh dispersion are in the range of 10.45 similar to 105.03 s. On this basis, a method of grid dispersion inversion is proposed to extract pure-path dispersion in a P x P grid from mixed-path dispersion. Then, the S velocity structure to a depth of 200 kin is inverted from pure-path dispersion in each grid cell, finally, the 3-D velocity structure of S wave is reconstructed beneath Burma Arc and its adjacent regions. The result shows that taking Sagain fault as the boundary, the velocity of crust on the west side of the fault is higher than one on the east side of the fault; lithosphere depth is in the range of 110 similar to 130 kin and the S wave velocity at the top of upper mantle is 4.3 similar to 4.4 km/s beneath the Indo-Burma regions; however, on the east side of Burma Are; there is a lower-velocity column of uprising mantle about 150 similar to 200 km wide beneath Yunnan-Myanmar-Thailand Block; the lithosphere depth is 70 similar to 80 kin and the velocity of S wave at the top of mantle is 4.1 similar to 4.2 km/s in the area. On the other hand, the S wave velocity structure shows an EW(east-west) variation, this distribution feature corresponds to the distribution of epicenters and volcanoes, and the strike of faults.
WOS关键词	YUNNAN
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000252841900018
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/68770]
专题	中国科学院地质与地球物理研究所
通讯作者	Hu Jia-Fu
作者单位	1.Yunnan Univ, Dept Geophys, Kunming 650091, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Hu Jia-Fu,Hu Yi-Li,Xia Jing-Yu,et al. Crust-mantle velocity structure of S wave and dynamic process beneath Burma Arc and its adjacent regions[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2008,51(1):140-148.
APA	Hu Jia-Fu,Hu Yi-Li,Xia Jing-Yu,Chen Yun,Zhao Hong,&Yang Hai-Yan.(2008).Crust-mantle velocity structure of S wave and dynamic process beneath Burma Arc and its adjacent regions.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,51(1),140-148.
MLA	Hu Jia-Fu,et al."Crust-mantle velocity structure of S wave and dynamic process beneath Burma Arc and its adjacent regions".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 51.1(2008):140-148.