A method for calculating synthetic seismograms in laterally varying media

Abstract

Summary An effective algorithm for computing synthetic seismograms in laterally inhomogeneous media has been developed. The method, based on zero‐order asymptotic ray theory, is primarily intended for use in refraction and reflection studies and provides an economical means of seismic modelling. A given smoothed velocity‐depth‐distance model is divided into small squares with constant seismic parameters and first‐order interfaces are represented by an arbitrary number of dipping linear segments. The computation of ray propagation and amplitudes through such a model does not involve complicated analytic expressions and therefore minimizes computer time. Amplitudes are determined by geometrical spreading of spherical wave‐fronts and energy partitioning at interfaces. Synthetic seismograms calculated for laterally homogeneous models are in good agreement with those obtained by the Reflectivity Method. Copyright © 1982, Wiley Blackwell. All rights reserved