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Numerical modeling based on the improved BSO algorithm for asymmetric elastic wave equations

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Abstract

With the continuous research in seismology, the influence of the heterogeneity caused by microstructure interactions of the medium on seismic wave propagation has been paid more attention. Wang et al. (2020) proposed to describe the complex microstructures of the medium in the framework of the generalized continuum mechanics theory, and derived the asymmetric elastic wave equations containing the characteristic length scale parameter of the medium. In addition, scale effects of seismic wave propagation will appear when considering microstructures of the medium. In this work, in order to better analyze the scale effects and extract the new components of wave fields owing to the microstructure interactions, we propose an optimized finite-difference (FD) method based on the improved bat swarm optimization (BSO) algorithm. Then the optimized FD method is used to perform numerical modeling for the asymmetric elastic wave equations considering microstructures of the medium. Numerical dispersion analysis indicate that the optimized FD method has high accuracy. According to the numerical modeling results obtained by the optimized FD method, scale effects of seismic wave propagation can be clearly observed when considering microstructures of the medium.

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Acknowledgments

This work was funded by “HYXD” national project under grant A2309002, XJZ2023050044.

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Authors and Affiliations

  1. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing, People’s Republic of China

    Cheng-fang Zhang & Zhi-yang Wang

  2. Third Research Institute of China Electronics Technology Group Corporation, Beijing, China

    Hai-xin Feng

  3. School of Energy and Power Engineering, Beihang University, Beijing, People’s Republic of China

    Zhi-chun Zhou

  4. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, People’s Republic of China

    Wen-lei Bai

  5. University of Chinese Academy of Sciences, Beijing, People’s Republic of China

    Wen-lei Bai

Authors
  1. Cheng-fang Zhang
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  2. Hai-xin Feng
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  3. Zhi-chun Zhou
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  4. Wen-lei Bai
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  5. Zhi-yang Wang
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Corresponding author

Correspondence to Zhi-yang Wang.

Additional information

This work was funded by “HYXD” national project under grant A2309002, XJZ2023050044.

Chengfang Zhang received a B.S. degree at the Beijing University of Chemical Technology, China, in 2020. He is currently pursuing a master’s degree at the College of Information Science and Technology, Beijing University of Chemical Technology, China. His main research focus is the finite difference method.

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Zhang, Cf., Feng, Hx., Zhou, Zc. et al. Numerical modeling based on the improved BSO algorithm for asymmetric elastic wave equations. Appl. Geophys. 20, 397–410 (2023). https://doi.org/10.1007/s11770-023-1024-0

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  • DOI: https://doi.org/10.1007/s11770-023-1024-0

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