Azimuthal Anisotropy of Receiver Functions in the Central South China Block and its Tectonic Implications

By the H-к stacking of receiver functions and splitting Pms phases, using seismic data from Regional Seismic Network Huanan Array, a high-resolution temporary array deployed for 2 years in study area. This revealed strong lateral heterogeneity crustal structures central South China block. Crustal thickness reduces northwest to southeast, with significant differences across boundary sub-blocks. The average Vp/Vs ratio gradually increases west east, leading high values coastal region, which suggests that subduction Pacific plate has possibly caused underplating magma or upwelling upper mantle material. azimuthal anisotropy Dabie orogen Jiangnan is generally consistent strike tectonic belt as well orientation absolute movement. We suggest related extension deformation lithosphere. crust close deformation. Cathaysia block are motion, indicating lithospheric under-invasion