Very practical reference rays for calculating S waves by means of the coupling ray theory are anisotropic common S-wave rays. The equations required for common S-wave ray tracing in a smooth elastic anisotropic medium, and for the corresponding dynamic ray tracing, are presented in a form suitable for numerical coding. The proposed algorithm has been coded, and two-point anisotropic common S-wave travel times have been numerically calculated by anisotropic common S-wave ray tracing in a test example. The computed two-point anisotropic common S-wave travel times are compared with the second-order travel-time perturbations from isotropic rays to anisotropic common S-wave rays.
Travel time, ray tracing, dynamic ray tracing, geometrical spreading, coupling ray theory, seismic anisotropy, inhomogeneous media.
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