Differential Deformation Patterns of the Central Tanlu Fault Zone Revealed by 3D Ambient Noise Radial Anisotropy Tomography With Improved Quality Control Process

Abstract In ambient noise tomography, although Love waves can be extracted from the horizontal component of ambient noise cross‐correlation functions (CCFs), it's still less used than Rayleigh waves because the data quality is generally lower compared to the vertical component. This study presents a refined workflow incorporating the Rayleigh‐wave phase‐matching method for quality control, ultimately leading to more robust and reliable inversion results. We apply this method to derive high‐quality Love wave phase velocity dispersion curves from the dense array in the Weifang segment of the Tanlu fault zone (TLFZ) in the North China Craton. Then, together with Rayleigh wave dispersion derived from the vertical component of CCFs, we use the direct tomography method for surface wave dispersion to invert for the high‐resolution three‐dimensional shear wave velocity and radial anisotropy model of the upper crust simultaneously. The result shows that the quality control process has significantly improved the reliability of the inverted radial anisotropy model. Our models provide new evidence for the neotectonic activity differences between the eastern and western branches of the TLFZ and reveal the different deformation modes between Luxi block and Ludong block in the upper crust since the Mesozoic.