气候变化领域集成服务门户(CCPortal): Seismic Azimuthal Anisotropy of Northeastern Tibetan Plateau From Ambient Noise Double Beamforming Tomography: Implications for Crustal Deformation

CCPortal

DOI	10.1029/2022JB026109
	Seismic Azimuthal Anisotropy of Northeastern Tibetan Plateau From Ambient Noise Double Beamforming Tomography: Implications for Crustal Deformation
	Wu, Xiaoyang; Guo, Zhen; Li, Shilin; Yu, Yong; Bai, Qipeng; Chen, Yongshun John
发表日期	2023
ISSN	2169-9313
EISSN	2169-9356
卷号	128 期号:6
英文摘要	In 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.
关键词	seismic ambient noise tomography double beamforming northeastern Tibetan Plateau seismic azimuthal anisotropy crustal deformation
英文关键词	SURFACE-WAVE TOMOGRAPHY; LOW-VELOCITY ZONE; MANTLE DEFORMATION; RADIAL ANISOTROPY; CROSS-CORRELATION; QILIAN-SHAN; BENEATH; EASTERN; INVERSION; EVOLUTION
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000999811800001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283594
作者单位	Southern University of Science & Technology; Chinese Academy of Sciences; Institute of Oceanology, CAS; Southern University of Science & Technology
推荐引用方式 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],2023,128(6).
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).
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).