Preconditioned Conjugate Gradient Algorithm-Based 2D Waveform Inversion for Shallow-Surface Site Characterization

Figure 4

Noise-free data test of the complex structure model. (a) The true model. The white arrows and the solid yellow circles represent the positions of the shots and the receivers. (b) The initial model. (c-d) The inversion results of the CG and the PCG. The black dotted lines represent the boundary where the S-wave velocity changes in the true model.

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