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Modeling 3D acoustic-wave propagation using modified cuboid-based staggered-grid finite-difference methods with temporal and spatial high-order accuracy

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Abstract

To improve the modeling accuracy and adaptability of traditional temporal second-order staggered-grid finite-difference (SFD) methods for 3D acoustic-wave modeling, we propose a modified time-space-domain temporal and spatial high-order SFD stencil on a cuboid grid. The grid nodes on a double-pyramid stencil and the standard orthogonality stencil are used to approximate temporal and spatial derivatives. This stencil can adopt different grid spacing in each spatial axis, and thus it is more flexible than the existing one with the same grid spacing. Based on the time-space-domain dispersion relation, the high-order FD coefficients are generated by using Taylor expansion and least squares. Numerical analyses and modeling examples demonstrate that our proposed schemes have higher accuracy and better stability than other conventional schemes, and thus larger time steps can be used to improve the computational efficiency in 3D case.

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Authors and Affiliations

  1. Department of Geophysics, School of Geology Engineering and Geomatics, Chang’an University, Xi’an, 710054, China

    Shigang Xu

  2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China

    Yang Liu

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  1. Shigang Xu
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  2. Yang Liu
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Correspondence to Shigang Xu.

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Xu, S., Liu, Y. Modeling 3D acoustic-wave propagation using modified cuboid-based staggered-grid finite-difference methods with temporal and spatial high-order accuracy. Stud Geophys Geod 64, 465–482 (2020). https://doi.org/10.1007/s11200-020-1013-1

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  • DOI: https://doi.org/10.1007/s11200-020-1013-1

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