1887

Abstract

Summary

The finite-difference (FD) method is widely used for the simulation of seismic-wave propagation. Since Rayleigh-wave wavelength usually increases with depth, we adopt a depth dependent nonuniform grid system in the FD modelling. The grid spacing generally increases exponentially with depth. The discretization of grids depends on two factors: the starting grid size and the increasing factor. By testing a homogeneous synthetic example, we chose the optimal discretization parameters by the tradeoff between accuracy and computational cost. As a rule of thumb, we choose a starting size of 2/3 of the horizontal resolution and an increase of grid spacing of 10% for the modelling of shallow-seismic wave fields. This nonuniform grid leads to an increase of accuracy while reducing the computational cost to about 55% compared to a uniform grid system. We also apply the nonuniform grid to a laterally heterogeneous model to prove the applicability of nonuniform FD method to a complex model.

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/content/papers/10.3997/2214-4609.201802568
2018-09-09
2020-07-08
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References

  1. Berg, P., If, F., Nielsen, P. and Skovgaard, O.
    [1994] Analytical reference solutions. Modeling the earth for oil exploration, 77, 421–427.
    [Google Scholar]
  2. Pan, Y., Gao, L. and Bohlen, T.
    [2018] Time-domain full-waveform inversion of Rayleigh and Love waves in presence of free-surface topography. Journal of Applied Geophysics, 152, 77–85.
    [Google Scholar]
  3. Pitarka, A.
    [1999] 3D Elastic Finite-Difference Modeling of Seismic Motion Using Staggered Grids with Nonuniform Spacing. Bulletin of the Seismological Society of America, 89, 54–68.
    [Google Scholar]
  4. Socco, L.V., Comina, C. and Khosro Anjom, F.
    [2017] Time-average velocity estimation through surface-wave analysis: Part 1—S-wave velocity. Geophysics, 82(3), U49–U59.
    [Google Scholar]
  5. Virieux, J.
    [1986] P-SV wave propagation in heterogeneous media: Velocity-stress finite-difference method. Geophysics, 51(4), 889–901.
    [Google Scholar]
  6. Zeng, C., Xia, J., Miller, R.D. and Tsoflias, G.P.
    [2012] An improved vacuum formulation for 2D finite-difference modeling of Rayleigh waves including surface topography and internal discontinuities. Geophysics, 77(1), T1–T9.
    [Google Scholar]
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