The 3D Seismic Azimuthal Anisotropies and Velocities in the Eastern Tibetan Plateau Extracted by an Azimuth-Dependent Dispersion Curve Inversion Method
文献类型：期刊论文
| 作者 | Liang, Chuntao2,3; Liu, Zhiqiang3; Hua, Qian4; Wang, Liang3; Jiang, Ningbo3; Wu, Jing1 |
| 刊名 | TECTONICS
 |
| 出版日期 | 2020-04-01 |
| 卷号 | 39期号:4页码:27 |
| ISSN号 | 0278-7407 |
| 关键词 | anisotropy fast propagation direction Tibetan Plateau low-velocity zone GPS velocity |
| DOI | 10.1029/2019TC005747 |
| 英文摘要 | An 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 |
| WOS关键词 | SPHERICAL-EARTH SEISMOGRAMS ; SPARSE LINEAR-EQUATIONS ; SPECTRAL-ELEMENT METHOD ; WAVE ARRAY TOMOGRAPHY ; SE TIBET ; CRUSTAL FLOW ; TECTONIC EVOLUTION ; 2-STATION ANALYSIS ; LUSHAN EARTHQUAKE ; RADIAL ANISOTROPY |
| 资助项目 | National 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] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000546683100004 |
| 资助机构 | 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 ; 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/97145]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Liang, Chuntao |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 2.Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvirom Prot, Chengdu, Peoples R China 3.Chengdu Univ Technol, Educ Minist China, Key Lab Earth Explorat & Informat Tech, Chengdu, Peoples R China 4.Shaanxi Earthquake Agcy, Xian, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。