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Direct Surface Wave Radial Anisotropy Tomography in the Crust of the Eastern Himalayan Syntaxis
Author(s) -
Hu Shaoqian,
Yao Huajian,
Huang Hui
Publication year - 2020
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1029/2019jb018257
Subject(s) - crust , anisotropy , geology , shear (geology) , rayleigh wave , s wave , seismology , geophysics , shear velocity , dispersion (optics) , seismic anisotropy , surface wave , tomography , geometry , mantle (geology) , petrology , mechanics , optics , physics , turbulence , mathematics
A novel method is implemented to invert Rayleigh and Love wave dispersion curves of all paths jointly for 3‐D shear wave velocity and radial anisotropy simultaneously without intermediate steps. We use the method to derive high‐precision crustal shear wave velocity and radial anisotropy models around the eastern Himalayan syntaxis using ambient noise dispersion data (5–40 s). Results show that the crust can be divided into several subregions with different rigidity and preferred mineral alignment orientation depth‐dependently. In the middle crust, combined with other geophysical observations, 3‐D geometry of two continuous branches of eastward channelized weak zones is outlined in detail. Both branches of the weak zone are blocked by the high velocity zone with radial anisotropy of V s h > V s v at around 96–97°E. In the upper crust, the radial anisotropy model depicts a complex pattern, which is associated with the ongoing surface uplifting and shear strain rate distribution.