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Crustal structure beneath SE Tibet from joint analysis of receiver functions and Rayleigh wave dispersion
Author(s) -
Sun Xiaoxiao,
Bao Xuewei,
Xu Mingjie,
Eaton David W.,
Song Xiaodong,
Wang Liangshu,
Ding Zhifeng,
Mi Ning,
Yu Dayong,
Li Hua
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl059269
Subject(s) - geology , crust , seismology , receiver function , rayleigh wave , block (permutation group theory) , joint (building) , dispersion (optics) , seismic array , flow (mathematics) , lithosphere , geophysics , surface wave , tectonics , geometry , physics , optics , engineering , architectural engineering , telecommunications , mathematics , computer science
New constraints on the pattern of crustal flow in SE Tibet are obtained from joint analysis of receiver functions and Rayleigh wave dispersion with a newly deployed seismic array. The crust in the Sichuan‐Yunnan Diamond Block has an average thickness of ~45 km and gradually thins toward the Indo‐China Block to the west and the Yangtze Block to the east. High V P / V S ratios are detected to the west of the Xiaojiang fault, but not in the Yangtze Block to the east. The S wave velocity profile reveals that intra‐crustal low‐velocity zones (IC‐LVZs) are strongly heterogeneous, with two LVZs in the middle and mid‐lower crust, respectively, in marked contrast to previous observations of a single LVZ. Combined with other observations, the two IC‐LVZs are interpreted as isolated channels of crustal flow at different depths beneath SE Tibet, resulting in the observed complex pattern of radial anisotropy and further elucidating patterns of flow and deformation.