P211 VSP Wavefield Separation. Model-based Waveby-Wave Approach Summary 1 Wavefield separation is one of the main steps in processing VSP data. The purpose of this paper is to develop an optimization approach for VSP wavefield separation in the time domain. We model the actual wavefield as a sum of waves with unknown parameters. The wavefield separation problem is reduced to a nonlinear optimization problem with a small number (usually from two to four) of unknown waves with their wave shape functions amplitudes and time-dependent time shifts. Introduction: Downgoing and upgoing P and S waves are used for different purposes. Downgoing


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