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	Imaging Poisson's Ratio of the Uppermost Mantle beneath China
	Pei S. P. ; Sun Y. S. ; Toksoz M. N. ; Chen Y. J. ; Gao X. ; Wang Z. ; Zhao J. M. ; Liu H. B.
	2011
关键词	travel-time tomography tibetan plateau velocity structure continental collision surrounding regions pn tomography california evolution inversion asia
英文摘要	We have obtained a Poisson's ratio image of the uppermost mantle beneath China by performing tomographic inversion of travel-time differences between Sn and Pn. The arrival pairs were selected from the Annual Bulletin of Chinese Earthquakes from 1985 to 2007 and from the International Seismological Center (ISC) data set between 1985 and 2005. The data include 58,663 arrival pairs from 10,486 earthquakes recorded at 204 stations. The average Poisson's ratio is 0.266. The preliminary tomographic results show that (1) the pseudowave velocity is high and the velocity ratio (V(P)/V(S)) and Poisson's ratio are low in the stable cratons around the Tibetan Plateau such as the Tarim and Junggar basins, the Ordos craton, and the southern region of the Sichuan basin; (2) a low pseudowave velocity and high velocity ratio and Poisson's ratio exist in the central and northern Tibetan Plateau, the North-South Seismic Zone, and north China; and (3) the high velocity ratio and Poisson's ratio region in the Tibetan Plateau extends to the surrounding cratons, suggesting that the uplift of the Tibetan Plateau results from a high Poisson's ratio or partially melted rocks beneath the plateau and that the softer rocks have intruded into the upper mantle of surrounding cratons.
出处	Bulletin of the Seismological Society of America
卷	101
期	3
页	1452-1461
收录类别	SCI
语种	英语
ISSN号	0037-1106
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23225]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Pei S. P.,Sun Y. S.,Toksoz M. N.,et al. Imaging Poisson's Ratio of the Uppermost Mantle beneath China. 2011.

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