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A simplified calculation for adaptive coefficients of finite-difference frequency-domain method

  • Seismic modeling and wave propagation
  • Published:
Applied Geophysics Aims and scope Submit manuscript

Abstract

The finite-difference frequency domain (FDFD) method is widely applied for simulating seismic wavefields, and a key to achieving successful FDFD simulation is to construct FDFD coefficients that can effectively suppress numerical dispersion. Among the existing FDFD coefficients for seismic wavefield simulation, adaptive FDFD coefficients that vary with the number of wavelengths per grid can suppress numerical dispersion to the maximum extent. The current methods for calculating adaptive FDFD coefficients involve numerical integration, conjugate gradient (CG) optimization, sequential initial value selection, and smooth regularization, which are difficult to implement and inefficient in calculations. To simplify the calculation of adaptive FDFD coefficients and improve the corresponding computational efficiency, this paper proposes a new method for calculating adaptive FDFD coefficients. First, plane-wave solutions with different discrete propagation angles are substituted in the FDFD scheme, and the corresponding least-squares problem is constructed. As this problem is ill-conditioned and obtaining smooth adaptive FDFD coefficients by the conventional solving method based on normal equations is difficult, this paper proposes solving the least-squares problem by solving the corresponding overdetermined linear system of equations through QR matrix decomposition. Compared with the existing methods for calculating adaptive FDFD coefficients based on numerical integration, CG optimization, and sequential initial value selection, the proposed method allows for a simplified computational process and considerably higher computational efficiency. Numerical wavefield simulation results show that the adaptive-coefficient FDFD method based on QR matrix decomposition can achieve the same accuracy as those based on numerical integration, CG optimization, and sequential initial value selection while requiring less computation time.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 42174161, No. 41974123), China Postdoctoral Science Foundation (No. 2022M711004), China National Petroleum Corporation Exploration and Development Research Institute Open Fund (No. 822102016), and the Jiangsu Province Science Fund for Distinguished Young Scholars (No. BK20200021).

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Correspondence to Jing Ba.

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Xu Wen-Hao received his Ph.D. degree in Information and Communication Engineering from Xi’an Jiaotong University in 2022 and has been working as an assistant researcher in the School of Earth Science and Engineering, Hohai University, since 2022. His main research interests are seismic wavefield simulation and seismic parameter inversion.

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Xu, WH., Ba, J., Carcione, J.M. et al. A simplified calculation for adaptive coefficients of finite-difference frequency-domain method. Appl. Geophys. 20, 262–277 (2023). https://doi.org/10.1007/s11770-023-1045-8

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  • DOI: https://doi.org/10.1007/s11770-023-1045-8

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