Reciprocity is applied to the situation where numerical simulations are needed for a number of source locations but relatively a few receiver positions. By invoking source-receiver reciprocity, the number of simulations can be generally reduced to three times the number of receiver positions. The procedure is illustrated for a heterogeneous medium with both single-force and double-couple sources. The numerical tests using a finite-difference implementation show that the reciprocal simulations can be performed with the same level of accuracy as the forward calculations. [References: 19]
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