f Large scale elastodynamics: A cost-effective, accurate and non-dispersive approach

High-order finite-difference (PD) schemes for the numerical integration of elastodynamic equations offer a viabIe answer to the challenges of large scale geophysical modeling. Several authors have proposed non-dispersive numerical spatial differentiators: such operators are designed by maximizing the spectral frequency band for which a peak relative error in the numerical group velocity is bounded by a specified threshold. In previous publications, the authors of this paper have explicitly addressed the cost-effectiveness issue in non-dispersive numerica! wave propagation.