Abstract:
This paper is a short review of recent methods of ray tracing with particular regard to the ones used in seismic transmission tomography. Some aspects are described with their main characteristics and drawbacks. The main aspects of Linear Traveltime Interpolation algorithm and its implementation is described in the case of a transversely isotropic medium also by the results of a synthetic model. Covariance matrices are used as a tool for the choice of the grid distribution of the investigated area. Some particular features are discussed and two case histories are shown considering both the cases of isotropic and transversely isotropic medium.