Abstract
Absorbing boundary conditions are widely used in numer ical modeling of wave propagation in unbounded media to reduce reflections from artificial boundaries (Lindman, 1975; Clayton and Engquist, 1977; Reynolds, 1978; Liao et aI., 1984; Cerjan et aI., 1985; Randall, 1988; Higdon, 1991). We are interested in a particular absorbing boundary condition that has maximum absorbing ability with a minimum amount of computation and storage. This is practical for 3-D simu lation of elastic wave propagation by a finite-difference method. Peng and Toksoz (1994) developed a method to design a class of optimal absorbing boundary conditions for a given operator length. In this short note, we give a brief
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