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Equations d'onde et modelesNormal access

Author: Ch. Hemon
Journal name: Geophysical Prospecting
Issue: Vol 26, No 4, December 1978 pp. 790 - 821
DOI: 10.1111/j.1365-2478.1978.tb01634.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 1.93Mb )

Summary:
The method of finite differences is applied to the computation of multi-dimensional synthetic seismograms. This paper gives a study of the mathematical and numerical formulations of the problem, the boundary conditions, the convergence conditions and how to simulate the source in both one solid or a liquid. It is shown that the numerical formulation chosen is valid both for direct and inverse problems (i.e. for modeling and migration). This formulation makes it possible to use the normal incidence reflection coefficients for P and S waves, whether they travel horizontally or vertically. The examples shown have been chosen on purpose in order to be easily interpreted. They do not give a full idea of the possibilities of the algorithm which allows to consider non-planar interfaces, except close to the vertical axis.


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