The rationale for generating comparable physical and computer models is given. The requirement for a finite-difference model with one of its internal horizons conforming to a physical boundary condition is explained. The boundary condition is that of a water-bottom; where the acoustic waves in the water interact with the elastic waves in the solid material below. The condition is developed for use within the staggered-grid representation. Examples are given for a model that matches a physical model in water, and for some simple offshore seismic type models.
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