A primary reflection from any layer located somewhere below a water bottom (Figure 1a) is accompanied on a seismic record by series of multiples whose raypaths include one or more extra reflections from a water bottom (Figure 1b) either at a shot and/or at a geophone location. These multiples often have comparable or larger amplitudes than some primary reflections from deeper layers, making interpretation confusingly complicated. Therefore, extensive efforts have been devoted and different methods have been elaborated for suppression of such multiples. An interesting method formulated by Morley and Claerbout (1983) is generally applicable in the case of variable water depth (i.e., when the seafloor on Figures 1a and 1b is not exactly horizontal). The method presented here is similar to the Morley and Claerbout method.

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