Surface wave array tomography in SE Tibet from ambient seismic noise and two-station analysis – II. Crustal and upper-mantle structure
Jun 06,2025
This paper investigates the 3-D shear wave speed variations in the crust and upper mantle of the southeastern borderland of the Tibetan Plateau using data from 25 temporary broad-band stations and one permanent station. The study employs Rayleigh wave phase velocity dispersion curves obtained from empirical Green’s functions (EGF) derived from ambient noise interferometry and traditional two-station (TS) analysis to construct phase velocity maps and estimate 3-D wave speed variations using the Neighbourhood Algorithm (NA). The results reveal significant lateral variations in shear wave speed, with prominent low-velocity layers (LVLs) in the middle and lower crust associated with major fault zones. The study concludes that crustal flow patterns are more complicated than previously thought, involving both middle and lower crustal flow.
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