An Approximate Inverse to the Extended Born Modeling Operator
نویسندگان
چکیده
We modify RTM to create an approximate inverse to the extended Born modeling operator in 2D. The derivation uses asymptotic ray theory and stationary phase principle, but the result applies directly to RTM. The inverse operator differs from the adjoint operator only by application of several explicit velocity-independent filters. This inverse operator, on the one hand, can be used as true amplitude migration (in the asymptotic sense). On the other hand, it can be used as preconditioner to speed up the iterations of Least-Squares Migration and Full Waveform Inversion.
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