Scattering theory is a direct non-linear framework for calculating wavefields in complex heterogeneous media. A 3D, wave-theoretic model (based on the scalar/viscoacoustic wave equation) of reflected primaries and transmitted direct waves is derivable based on retention/rejection of certain pre- and postscattering Green's function propagation directions. This model generates primaries that have propagated through a complex overburden and interacted with a complex target, but represents an intensive computation problem. A further, hybrid approximation involving non-linear transmission through an extended 1D overburden perturbation and linear interaction with a 2D target restricts the model's applicability but dramatically reduces the associated computational burden.
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