The imaging quality and efficiency of elastic reverse-time migration (RTM) depends strongly on the algorithms used for the solving of elastic wave equations. To improve the quality and efficiency for seismic imaging, an efficient staggered-grid finite-difference (SFD) scheme based on a sampling interpolation method with adaptive variable difference operator lengths is proposed to perform elastic RTM. Numerical analysis shows that the sampling interpolation SFD scheme has higher accuracy than the conventional Taylor-series expansion SFD scheme for solving elastic wave equations. The proposed elastic RTM algorithm is also tested using a theoretical model. The model test demonstrates that elastic RTM using the sampling interpolation SFD scheme can obtain better images than that using the Taylor-series expansion SFD scheme, particularly for PS images. In addition, the application of adaptive variable difference operator lengths can effectively improve the computational efficiency in elastic RTM.


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