气候变化领域集成服务门户(CCPortal): Crustal shear wave velocity and radial anisotropy in the Xiaojiang fault zone system (SE Tibet) revealed by ambient noise interferometry

CCPortal

DOI	10.1016/j.tecto.2020.228594
	Crustal shear wave velocity and radial anisotropy in the Xiaojiang fault zone system (SE Tibet) revealed by ambient noise interferometry
	Yang Y.; Hu S.; Yao H.; Fang L.; Wu J.
发表日期	2020
ISSN	00401951
卷号	792
英文摘要	The Xiaojiang fault zone system (XJFS) is located in the southeastern Tibet with high seismicity. In this study, we invert Rayleigh and Love wave dispersion curves obtained from three dense seismic arrays jointly for high-resolution 3-D crustal average shear wave velocity and radial anisotropy models simultaneously in XJFS. Our model reveals that the upper crust and mid-lower crust generally exhibit negative and positive radial anisotropy, respectively, implying that the deformation pattern is depth-dependent. To the east of the Lvzhijiang Fault, most of the low velocity zones in the mid-crust correspond to the positive radial anisotropy (Vsh > Vsv); the channelized weak zone seems to be continuous across the Red River Fault at depth of 20 km, probably within a thin layer. West of the Lvzhijiang Fault, where it is inferred to be the inner zone of the Permian Emeishan Large Igneous Province, the high velocity zone and positive radial anisotropy in the mid-lower crust can be attributed to the underplating and intruded magmatic rocks. In the upper crust, the high and low velocity zones are mostly belt-shape and follow the north-south direction parallel to the regional major faults; the lateral variation of the radial anisotropy spatially corresponds to the activity of different segments of the Xiaojiang fault zone. Our models depict detailed geometry of the channelized weak zone in the mid-lower crust and provide new insight into the role of major faults in regional tectonics. © 2020 Elsevier B.V.
关键词	Ambient noise tomography Crustal shear wave velocity Radial anisotropy Southeastern Tibet Xiaojiang fault zone system
英文关键词	Acoustic wave velocity; Anisotropy; Dispersion (waves); Igneous rocks; Shear waves; Wave propagation; Deformation pattern; Emeishan large igneous provinces; Lateral variations; Love wave dispersion; Low velocity zones; Radial anisotropy; Regional tectonics; Shear wave velocity; Shear flow; ambient noise; anisotropy; crustal structure; interferometry; Love wave; Rayleigh wave; S-wave; seismicity; wave velocity; China; Red River Fault Zone; Xiaojiang Fault Zone; Yunnan
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207904
作者单位	Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science of Technology of China, Hefei, Anhui 230026, China; Hubei Subsurface Multi-scale Imaging Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, 430074, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Mengcheng, Anhui 233500, China; CAS Center for Excellence in Comparative Planetology, Hefei, Anhui 230026, China; Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China
推荐引用方式 GB/T 7714	Yang Y.,Hu S.,Yao H.,et al. Crustal shear wave velocity and radial anisotropy in the Xiaojiang fault zone system (SE Tibet) revealed by ambient noise interferometry[J],2020,792.
APA	Yang Y.,Hu S.,Yao H.,Fang L.,&Wu J..(2020).Crustal shear wave velocity and radial anisotropy in the Xiaojiang fault zone system (SE Tibet) revealed by ambient noise interferometry.Tectonophysics,792.
MLA	Yang Y.,et al."Crustal shear wave velocity and radial anisotropy in the Xiaojiang fault zone system (SE Tibet) revealed by ambient noise interferometry".Tectonophysics 792(2020).