Abstract

Wave-equation extrapolation and adaptive subtraction methods are well established technique for water-bottom and pegleg multiple attenuation (Bernth and Sonneland, 1983; Wiggins, 1988; Julien and Raoult, 1989; Hardy et al., 1991). Conventional implementations of the method, however, can encounter several drawbacks: (1) They behave poorly in the presence of spatial aliasing due to insufficient sampling in the offset dimension; (2) They behave poorly in the presence of pegleg multiples from dipping water bottoms due to multiple emulation not fully honoring real water bottom geometry; (3) They occasionally degrade primaries in the presence of noisy data (which is unfortunately often the case) due to insufficient constraints to the adaptive filter. All of these problems can be mitigated with modifications to the algorithms.

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