| Seismic anisotropy beneath Southern Tibet |
| |
| 作者姓名： | 吕庆田 马开义 姜枚 |
| |
| 作者单位： | QING-TIAN LUI;KAI-YI MA;MEI JIANG;A. Hirn andA. Nercessian( Institute of Mineral Deposits，CAGS，Beijing 100037，China)(Seismological Dept IPG 4 Place Jussieu，75252 France) |
| |
| 摘 要： | ＳｅｉｓｍｉｃａｎｉｓｏｔｒｏｐｙｂｅｎｅａｔｈＳｏｕｔｈｅｒｎＴｉｂｅｔＱＩＮＧ－ＴＩＡＮＬＵＩ（吕庆田），ＫＡＩ－ＹＩＭＡ（马开义），ＭＥＩＪＩＡＮＧ＇（姜枚），Ａ．ＨｉｒｎａｎｄＡ．Ｎｅｒｃｅｓｓｉａｎ（ＩｎｓｔｉｔｕｔｅｏｆＭｉｎｅｒａｌＤｅ...
|
| 收稿时间： | 3 November 1994 |
| 修稿时间： | 19 May 1995 |
Seismic anisotropy beneath Southern Tibet |
| |
| Qing-Tian Lü, Kai-Yi Ma, Mei Jiang, A. Hirn and A. Nercessian.Seismic anisotropy beneath Southern Tibet[J].Acta Seismologica Sinica(English Edition),1996,9(2):279-287. |
| |
| Authors: | Qing-Tian Lü Kai-Yi Ma Mei Jiang A Hirn and A Nercessian |
| |
| Institution: | (1) Institute of Mineral Deposits, CAGS, 100037 Beijing, China;(2) Seismological Dept., IPG, 4 Place Jussieu, 75252 Paris, France;(3) Present address: Postgraduated School (Beijing), China University of Geosciences, China |
| |
| Abstract: | We have examined shear-wave splitting in teleseismic waves (SKS) recorded on 20 seismographs deployed on a profile that followed
the Southern Tibet highway during the 1992 Sino-French seismic experiment. The “cross-correlation” method is applied to derive
splitting parameters. The most striking feature is the abrupt variation in splitting orientation across ITS. North of ITS,
12 stations have an average N70°E orientation of the fast wave, with a delay between the fast and slow waves of up to 1 second.
On the contrary, 7 stations located to the south of ITS show an N25°W orientation and a smaller magnitude. We compare the
observations with surface geological features and discuss the source of anisotropy and its constraints on the deformation
model of the Tibetan Plateau. Our studies suggest that the anisotropy may be generated by the high strain induced by the underthrusting
of the India lithosphere in the south of ITS. North of ITS, anisotropy may relate to ductile deformation and flow in the upper
mantle. Analysis of the anisotropy pattern with the deformation models of the Tibetan Plateau suggests that both internal
ductile deformation and continental northeastward extrusion contribute to crustal shortening and uplift of the Tibetan Plateau.
This Sino-French Tibetan seismic experiment was sponsored by the Ministry of Geology and Mineral Resources of China, and the
Centre National de la Recherche Scientifique and the Direction de la Recherche et des Etudes Doctorales, Ministry of Public
Education in France. During our investigation, we have received valuable assistance from several institutes and personnal:
The Tibetan local government, Military District, Bureau of Geology, Bureau of Seismology, Committee of Sciences and Technology,
and Lhasa Seismic Station. |
| |
| Keywords: | Tibetan Plateau anisotropy shear-wave splitting upper mantle |
| 本文献已被 CNKI SpringerLink 等数据库收录！ |
|
