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Crustal structure across Longmenshan fault belt from passive source seismic profiling

文献类型：期刊论文

作者Zhang, Zhongjie1; Wang, Yanghua2; Chen, Yun1; Houseman, Gregory A.3; Tian, Xiaobo1; Wang, Erchie1; Teng, Jiwen1
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2009-09-05
卷号36
ISSN号0094-8276
DOI10.1029/2009GL039580
文献子类Article
英文摘要We analyse receiver functions from 29 broad-band seismographs along a 380-km profile across the Longmenshan (LMS) fault belt to determine crustal structure beneath the east Tibetan margin and Sichuan basin. The Moho deepens from about 50 km under Songpan-Ganzi in east Tibet to about 60 km beneath the LMS and then shallows to about 35 km under the western Sichuan basin. The average crustal Vp/Vs ratios vary in the range 1.75-1.88 under Songpan-Ganzi in east Tibet, 1.8-2.0 under the LMS, and decrease systematically across the NW part of the Sichuan basin to less than 1.70. A negative phase arrival above the Moho under Songpan-Ganzi and Sichuan basin is interpreted as a PS conversion from the top of a low-velocity layer in the lower crust. The very high crustal Vp/Vs ratio and negative polarity PS conversion at the top of lower crust in east Tibet are inferred to be seismic signatures of a low-viscosity channel in the eastern margin of the Tibetan plateau. The lateral variation of Moho topography, crustal Vp/Vs ratio and negative polarity PS conversion at the top of the lower crust along the profile seem consistent with a model of lower crust flow or tectonic escape. Citation: Zhang, Z., Y. Wang, Y. Chen, G. A. Houseman, X. Tian, E. Wang, and J. Teng (2009), Crustal structure across Longmenshan fault belt from passive source seismic profiling, Geophys. Res. Lett., 36, L17310, doi:10.1029/2009GL039580.
WOS关键词TIBETAN PLATEAU ; CONTINENTAL COLLISION ; ASIA ; LITHOSPHERE ; MANTLE ; FLOW ; SUBDUCTION ; BENEATH ; MARGIN
WOS研究方向Geology
语种英语
WOS记录号WOS:000269635600005
出版者AMER GEOPHYSICAL UNION
资助机构Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; 40830315) ; 40830315) ; 40830315) ; 40830315) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; 40830315) ; 40830315) ; 40830315) ; 40830315) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; 40830315) ; 40830315) ; 40830315) ; 40830315) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; Chinese Academy of Sciences(KZCX2-YW-132) ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; National Nature Science Foundation of China(40721003 ; 40830315) ; 40830315) ; 40830315) ; 40830315)
源URL[http://ir.iggcas.ac.cn/handle/132A11/70416]  
专题中国科学院地质与地球物理研究所
通讯作者Zhang, Zhongjie
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2BP, England
3.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
推荐引用方式
GB/T 7714		 Zhang, Zhongjie,Wang, Yanghua,Chen, Yun,et al. Crustal structure across Longmenshan fault belt from passive source seismic profiling[J]. GEOPHYSICAL RESEARCH LETTERS,2009,36.
APA Zhang, Zhongjie.,Wang, Yanghua.,Chen, Yun.,Houseman, Gregory A..,Tian, Xiaobo.,...&Teng, Jiwen.(2009).Crustal structure across Longmenshan fault belt from passive source seismic profiling.GEOPHYSICAL RESEARCH LETTERS,36.
MLA Zhang, Zhongjie,et al."Crustal structure across Longmenshan fault belt from passive source seismic profiling".GEOPHYSICAL RESEARCH LETTERS 36(2009).

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来源：地质与地球物理研究所

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