2D QP anisotropic stereo-tomography for VTI media in triangulated model

Based on the anisotropic ray perturbation theory in slowness squared triangulated model, a 2D QP wave anisotropic stereo-tomography for VTI media is presented. Due to the sparsity of slowness-squared triangulated model, the scale of FRECHET derivative matrix of stereo-tomography is greatly reduced thus the computational cost is significantly cut down. Meanwhile, the accuracy of a joint inversion of the interface position, background velocity and anisotropic parameters is pretty good. The numerical examples demonstrated the correctness of the presented Frechet derivatives and the feasibility of the inversion strategy.