Finite-difference Elastic Modelling Below a Structured Free Surface

Summary This paper shows experiments using a unique method of implementing a structured free surface boundary for a finite-difference model. The method employs the same concepts as the implicit solutions used for finite-difference formulations posed in a recursive manner. The displacements required across the free surface boundary are then found by a deterministic method where structure is locally flat, and by an implicit method where the structure is sloped, proceeding from low to higher elevations. The limitations to this technique are shown, and a practical example is given.