IGGCAS OpenIR  > 岩石圈演化国家重点实验室
The 3D Seismic Azimuthal Anisotropies and Velocities in the Eastern Tibetan Plateau Extracted by an Azimuth-Dependent Dispersion Curve Inversion Method
Liang, Chuntao1,2; Liu, Zhiqiang2; Hua, Qian3; Wang, Liang2; Jiang, Ningbo2; Wu, Jing4
2020-04-01
Source PublicationTECTONICS
ISSN0278-7407
Volume39Issue:4Pages:27
AbstractAn azimuth-dependent dispersion curve inversion (ADDCI) method is applied to Rayleigh waves to extract 3D velocity and azimuthal anisotropy. The synthetic tests show that the ADDCI method is able to extract azimuthal anisotropy at different depths. The errors of the fast propagation direction (FPD) and the magnitude of the anisotropy (MOA) are less than 10 degrees and 1-2%, respectively. The 3D anisotropic model shows large variations in the FPDs and MOAs with depth and blocks; strong contrasts are observed across major faults, and the average MOA in the crust is approximately 3%. The FPDs are positively correlated with the GPS velocity direction and the strikes of regional faults in most of the blocks. The low-velocity zones (LVZs) in middle to lower crust are widely observed in the Songpan-Ganze terrane, the north Chuan-Dian block, and surprisingly in the Huayingshan thrust and fold belt. The LVZs in middle crust are also positively correlated with a region of low velocities in the uppermost mantle. These observations may suggest that large-scale deformation is coupled vertically from surface to uppermost mantle. Crust shortening by the pure shearing process, which involves the thrusting and folding of the upper crust and the lateral extrusion of blocks, may be the major mechanism causing the growth of the eastern Tibetan Plateau. Key Points An azimuth-dependent dispersion curve inversion (ADDCI) method to find the 3D anisotropy and velocity model for the eastern Tibetan Plateau and the western Yangtze Craton; fast propagation directions and magnitudes of anisotropies show strong variations in depth and between different blocks The fastest propagation directions of seismic waves are positively correlated with the GPS velocity directions and the strikes of regional faults in most of the blocks Velocities, magnitudes, and the fast propagation directions of anisotropies show strong block characteristics. This is consistent with the pure shearing model that involves lateral block extrusion and folding and thrusting in the upper crust
Keywordanisotropy fast propagation direction Tibetan Plateau low-velocity zone GPS velocity
DOI10.1029/2019TC005747
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordSPHERICAL-EARTH SEISMOGRAMS ; SPARSE LINEAR-EQUATIONS ; SPECTRAL-ELEMENT METHOD ; WAVE ARRAY TOMOGRAPHY ; SE TIBET ; CRUSTAL FLOW ; TECTONIC EVOLUTION ; 2-STATION ANALYSIS ; LUSHAN EARTHQUAKE ; RADIAL ANISOTROPY
Language英语
Funding ProjectNational Key R&D Program of China[2018YFC1503401] ; National Key R&D Program of China[2016ZX05023-004] ; National Natural Science Foundation of China[41674059] ; National Natural Science Foundation of China[41340009]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000546683100004
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/97145
Collection岩石圈演化国家重点实验室
Corresponding AuthorLiang, Chuntao
Affiliation1.Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvirom Prot, Chengdu, Peoples R China
2.Chengdu Univ Technol, Educ Minist China, Key Lab Earth Explorat & Informat Tech, Chengdu, Peoples R China
3.Shaanxi Earthquake Agcy, Xian, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Liang, Chuntao,Liu, Zhiqiang,Hua, Qian,et al. The 3D Seismic Azimuthal Anisotropies and Velocities in the Eastern Tibetan Plateau Extracted by an Azimuth-Dependent Dispersion Curve Inversion Method[J]. TECTONICS,2020,39(4):27.
APA Liang, Chuntao,Liu, Zhiqiang,Hua, Qian,Wang, Liang,Jiang, Ningbo,&Wu, Jing.(2020).The 3D Seismic Azimuthal Anisotropies and Velocities in the Eastern Tibetan Plateau Extracted by an Azimuth-Dependent Dispersion Curve Inversion Method.TECTONICS,39(4),27.
MLA Liang, Chuntao,et al."The 3D Seismic Azimuthal Anisotropies and Velocities in the Eastern Tibetan Plateau Extracted by an Azimuth-Dependent Dispersion Curve Inversion Method".TECTONICS 39.4(2020):27.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Liang, Chuntao]'s Articles
[Liu, Zhiqiang]'s Articles
[Hua, Qian]'s Articles
Baidu academic
Similar articles in Baidu academic
[Liang, Chuntao]'s Articles
[Liu, Zhiqiang]'s Articles
[Hua, Qian]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Liang, Chuntao]'s Articles
[Liu, Zhiqiang]'s Articles
[Hua, Qian]'s Articles
Terms of Use
No data!
Social Bookmark/Share
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit Add to Technorati
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.