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Seismic anisotropy of the northeastern margin of the Tibetan Plateau derived from analysis of SKS and Pms seismic phases
Guo GuiHong1,2; Wu ChengLong3; Tang GuoBin4,5; Hou Jue3,6,7; Zhang MingHui8; He ZhiHong9; Zhang Zhi4,5; Pu Ju10; Liu XuZhou10; Chen JiFeng10; Cheng JianWu10
2019-05-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume62Issue:5Pages:1650-1662
AbstractRock deformation may produce anisotropy, thus, seismic anisotropy contains deformation of the crust and upper mantle. Based on teleseismic SKS and Pms phases recorded by permanent broadband stations in Gansu and Qinghai provinces in the northeastern margin of the Tibetan Plateau, shear-wave splitting analysis is made to investigate the seismic anisotropy of crust and upper mantle in this region, which permits to infer the related deformation mechanism. This study obtains 230 pairs of splitting parameters at 56 stations using the minimum transverse energy method and rotation correlation method jointly from teleseismic SKS phase. The splitting parameters of crustal anisotropy were also revealed by the data from 24 stations using the sinusoidal moveout of the P-to-S converted phase from the Moho (Pms) in receiver functions. The matches and mismatches between observations at the surface and those from deep structures provide critical clues regarding the nature of the geodynamic process. Our shear-wave splitting results show that the average fast polarization directions of SKS and Pms are 123 degrees and 132 degrees, respectively. The NW-SE directed fast directions of crust and upper mantle are generally consistent with the main active structures on the surface, suggesting a vertically coherent deformation within the lithosphere. The average splitting times of SKS and Pms are 1. 0 s and 0.6 s, respectively, indicating that crustal anisotropy appears to play an important role in explaining the amount of SKS splitting times. The fast directions of SKS and Pms near the Kunlun fault are approximately parallel to its strike, which suggests that the Kunlun fault cut through the lithospheric mantle. However, the angle difference between the fast directions of SKS and Pms at the eastern Altyn Tagh fault implies the fault is a crustal-scale structure at its eastern end.
KeywordNortheastern Tibetan Plateau Upper mantle Crust Anisotropy Shear-wave splitting
DOI10.6038/cjg2019N0093
WOS KeywordUPPER-MANTLE ; DEFORMATION BENEATH ; CRUSTAL STRUCTURE ; LITHOSPHERE ; SUBDUCTION ; RANGE
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000467308600007
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/91499
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhang Zhi
Affiliation1.Lanzhou Univ, Lanzhou 730000, Gansu, Peoples R China
2.Key Lab Mech Disaster & Environm Western China, Lanzhou 730000, Gansu, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Coll Earth Sci, Guangxi Key Lab Hidden Metall Ore Deposits Explor, Guangxi 541004, Guilin, Peoples R China
5.Guilin Univ Technol, Guangxi 541004, Guilin, Peoples R China
6.Chinese Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China
7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
8.Binzhou Univ, Inst Informat Engn, Binzhou 256600, Shandong, Peoples R China
9.Kunming Prospecting Design Inst China Nonferrous, Kunming 650051, Yunnan, Peoples R China
10.China Earthquake Adm, Lanzhou Inst Seismol, Lanzhou 730000, Gansu, Peoples R China
Recommended Citation
GB/T 7714
Guo GuiHong,Wu ChengLong,Tang GuoBin,et al. Seismic anisotropy of the northeastern margin of the Tibetan Plateau derived from analysis of SKS and Pms seismic phases[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2019,62(5):1650-1662.
APA Guo GuiHong.,Wu ChengLong.,Tang GuoBin.,Hou Jue.,Zhang MingHui.,...&Cheng JianWu.(2019).Seismic anisotropy of the northeastern margin of the Tibetan Plateau derived from analysis of SKS and Pms seismic phases.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,62(5),1650-1662.
MLA Guo GuiHong,et al."Seismic anisotropy of the northeastern margin of the Tibetan Plateau derived from analysis of SKS and Pms seismic phases".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 62.5(2019):1650-1662.
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