Abstract
Summary For wavefield simulation and imaging, the k-space method is one of the highly accurate wave propagation methods. However, to describe the material heterogeneity, the conventional first-order k-space method requires many mixed-domain operators, which are the most expensive part of the wave-extrapolation process. We have analyzed and summarized the problem of the conventional k-space method as symmetrical factorization of the wave propagators. Based on this analysis, we develop a new asymmetrical factorization-based k-space method that can significantly reduce the number of mixed-domain operators without compromising modeling accuracy. The elastic numerical examples demonstrate the correctness and effectiveness of our method.
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