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Seismic Azimuthal Anisotropy of Northeastern Tibetan Plateau From Ambient Noise Double Beamforming Tomography: Implications for Crustal Deformation
Wu, Xiaoyang1,2; Guo, Zhen1,3; Li, Shilin1; Yu, Yong1; Bai, Qipeng4; Chen, Yongshun John1
2023-06-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume128Issue:6Pages:16
Corresponding AuthorGuo, Zhen(guoz3@sustech.edu.cn) ; Chen, Yongshun John(johnyc@sustech.edu.cn)
AbstractIn this study, we obtain a three-dimensional (3-D) high resolution seismic anisotropy model of NE Tibet using ambient noise double beamforming (DBF) tomography with ChinArray-Himalaya II data. DBF tomography technique allows for the simultaneous derivation of local phase velocity and azimuthal anisotropy from ambient noise cross-correlations without performing tomographic inversion. Based on the DBF tomography results, we have constructed a high resolution 3-D azimuthal anisotropic shear wave velocity model of NE Tibet. Our model indicates the presence of prominent low velocities and strong azimuthal anisotropy in the mid-to lower crust beneath the Songpan-Ganzi belt, while the mid-to lower crust of the Qilian belt exhibits relatively weak low velocity and azimuthal anisotropy. We propose that crustal channel flow may be the primary mechanism driving crustal deformation in the Songpan-Ganzi belt, which is in the mature part of the plateau. As the Qilian belt is at an early stage of plateau formation, it is characterized by crustal shortening with the development of a sub-vertical foliation. Additionally, the misalignment between predicted and observed shear wave splitting reveals decoupled crust and upper mantle deformation west of the Ordos block where eastward mantle flow is deflected by the lithospheric keel of Ordos.
Keywordseismic ambient noise tomography double beamforming northeastern Tibetan Plateau seismic azimuthal anisotropy crustal deformation
DOI10.1029/2022JB026109
Indexed BySCI
Language英语
Funding ProjectNational Science Foundation of China[42122027] ; National Science Foundation of China[41974052] ; National Science Foundation of China[41890814] ; National Science Foundation of China[U1901602] ; National Science Foundation of China[41904056] ; Shenzhen Sustainable Development Science and Technology Project[KCXFZ20201221173608023] ; Shanghai Science and Technology Committee[19dz1200200]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000999811800001
PublisherAMER GEOPHYSICAL UNION
WOS KeywordSURFACE-WAVE TOMOGRAPHY ; LOW-VELOCITY ZONE ; MANTLE DEFORMATION ; RADIAL ANISOTROPY ; CROSS-CORRELATION ; QILIAN-SHAN ; BENEATH ; EASTERN ; INVERSION ; EVOLUTION
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/183224
Collection海洋地质与环境重点实验室
Corresponding AuthorGuo, Zhen; Chen, Yongshun John
Affiliation1.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
3.Shanghai Sheshan Natl Geophys Observ & Res Stn, Shanghai, Peoples R China
4.Southern Univ Sci & Technol, Acad Adv Interdisciplinary Studies, Shenzhen, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wu, Xiaoyang,Guo, Zhen,Li, Shilin,et al. Seismic Azimuthal Anisotropy of Northeastern Tibetan Plateau From Ambient Noise Double Beamforming Tomography: Implications for Crustal Deformation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(6):16.
APA Wu, Xiaoyang,Guo, Zhen,Li, Shilin,Yu, Yong,Bai, Qipeng,&Chen, Yongshun John.(2023).Seismic Azimuthal Anisotropy of Northeastern Tibetan Plateau From Ambient Noise Double Beamforming Tomography: Implications for Crustal Deformation.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(6),16.
MLA Wu, Xiaoyang,et al."Seismic Azimuthal Anisotropy of Northeastern Tibetan Plateau From Ambient Noise Double Beamforming Tomography: Implications for Crustal Deformation".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.6(2023):16.
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