Modelowanie trajektorii promieni i czasów przebiegu fal odbitych PP, SS i PS dla dyskretnego ośrodka poprzecznie izotropowego z nachyloną osią symetrii

In the presented paper the basic assumptions of the algorithm and program of seismic ray trajectories and travel times modelling are described for the case of reflected PP, SS and PS waves in the discrete anisotropic (transversely isotropic) medium with tilted symmetry axis. The ray trajectories and travel times in the discrete horizontally layered medium (VTI) and in the monoclinally dipping layers are defined by means of the numerical solution of the partial equations set resulting from the Fermat principle. The values of the velocities and Thomsen anisotropy parameters are defined in the nodes of the assumed, two dimensional grid. The comparison of the reflection waves hodographs was accomplished for selected isotropic and anisotropic models in the case of CDP gathers.