Reverse-time migration as the conjugate of forward modeling

Jun Ji

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ABSTRACT

This paper presents a reverse-time migration algorithm as the conjugate of the forward time-extrapolation modeling. The conjugate operator is obtained by formulating the forward operator explicitly and by transposing the forward operator. The algorithm is tested by a numerical experiment for a 1-D layered model. A method to suppress artifacts, which are caused by the intrinsic non-unitary property of the operator, is introduced using the least-squares optimization technique.