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M., and Loewenthal, D., 1984, Elastic wave calculations quency dispersion is of a nature usually found in seismic work by the Fourier method: BSSA, 74, 875-89 1. and the essential properties of the field can still be observed. Marfurt, K. I., 1984, Accuracy of finite-difference and finite-element modeling of the scalar and elastic wave equations: Geophysics, 49, Migration, the inverse of modeling, traditionally has been done 533-549. However, Neves, K. W., 1983, Vector algorithms as a function of hardware architecture: extrapolation in depth is not always a stable process due to evanescent Presented by SIAM conference on parallel processing, Norfolk. However, efforts to apply this result to modeling problems, not to mention inverse problems, have yet to be published. High Order Finite-Difference Modeling s15.5 and Reverse time Migration Zero-offset stack modeling and migration methods D. Loewenthal, Federal Univ. of Bahia, Brazil, on leave from Our objective in this work is to treat the problems of modeling Tel-Aviv Univ., Israel; C. J. Wang and 0. G. Johnson, AGL, and migrating zero-offset stacked section (i.e., after stack processing) Univ. of Houston In modeling, we imitate the actual The treatment of the full acoustic wave equation by secondorder seismic field experiment and simulate it in the computer.