Research Article

Optimal 25-Point Finite-Difference Subgridding Techniques for the 2D Helmholtz Equation

Figure 3

(a) A near-surface low-velocity layer model, (b) the real part of the solution for obtained by the refined subgridding 25p with , (c) the common-shot-point records for the wavefield by the refined uniform 25p with uniform grid size , (d) the common-shot-point records for the wavefield by the refined subgridding 25p with , (e) synthetic seismograms generated by the refined uniform 25p with for the point (300 m, 0 m), and (f) synthetic seismograms generated by the refined subgridding 25p with for the point (300 m, 0 m).
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