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Complex seismic anisotropic structure beneath the central Tien Shan revealed by shear wave splitting analyses
Li, YH; Wu, QJ; Jiang LJ(江丽君); Jiang, LJ; Zhang, RQ
2010
发表期刊GEOPHYSICAL JOURNAL INTERNATIONAL
卷号181期号:3页码:1678-1686
通讯作者[Li, Yonghua ; Wu, Qingju ; Zhang, Ruiqing] China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China ; [Jiang, Lijun] CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
摘要P>Shear wave splitting parameters (fast polarization directions and splitting times) obtained at the permanent broad-band station Wushi (WUS), which is situated in central Tien Shan, China, demonstrate systematic azimuthal variations. The fast polarization directions range from 26 degrees to 85 degrees and the delay times range from 0.4 to 1.6 s, suggesting a complex anisotropic structure that cannot be adequately explained by a single anisotropic layer with horizontal axis of symmetry. The azimuthal variations have an apparent 90 degrees periodicity and thus can be best explained by a two-layer anisotropic model with horizontal symmetry axes. The optimal fast direction for the upper layer is in the 60 degrees-80 degrees range that is subparallel to the strike of the Tien Shan orogenic belt, and can consequently be attributed to the ongoing N-S directed shortening. The fast direction for the lower layer ranges from 85 degrees to 105 degrees and can be explained by lattice-preferred orientation of olivine crystals in the asthenosphere associated with present-day absolute plate motion of the Eurasian plate.
文章类型Article
关键词Seismic anisotropy Kinematics of crustal and mantle deformation Asia
学科领域Geochemistry & Geophysics
DOI10.1111/j.1365-246X.2010.04589.x
研究领域[WOS]Geochemistry & Geophysics
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语种英语
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000277716400034
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/239473
专题多学科研究中心
作者单位中国科学院高能物理研究所
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Li, YH,Wu, QJ,Jiang LJ,et al. Complex seismic anisotropic structure beneath the central Tien Shan revealed by shear wave splitting analyses[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2010,181(3):1678-1686.
APA Li, YH,Wu, QJ,江丽君,Jiang, LJ,&Zhang, RQ.(2010).Complex seismic anisotropic structure beneath the central Tien Shan revealed by shear wave splitting analyses.GEOPHYSICAL JOURNAL INTERNATIONAL,181(3),1678-1686.
MLA Li, YH,et al."Complex seismic anisotropic structure beneath the central Tien Shan revealed by shear wave splitting analyses".GEOPHYSICAL JOURNAL INTERNATIONAL 181.3(2010):1678-1686.
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