A reciprocity method for multiple-source simulations

Reciprocity is applied to the situation where numerical simulations are nee ded for a number of source locations but relatively a few receiver position s. By invoking source-receiver reciprocity, the number of simulations can b e generally reduced to three times the number of receiver positions. The pr ocedure is illustrated for a heterogeneous medium with both single-force an d double-couple sources. The numerical tests using a finite-difference impl ementation show that the reciprocal simulations can be performed with the s ame level of accuracy as the forward calculations.