Downward continuation |
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Figure 7. Reconstruction after modeling. Left is by the nearest-neighbor Kirchhoff method. Right is by the phase shift method. |
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Figure 7.8 shows the temporal spectrum of the original sigmoid model, along with the spectrum of the reconstruction via phase-shift methods. We see the spectra are essentially identical with little growth of high frequencies as we noticed with the Kirchhoff method in Figure .
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Figure 8. Top is the temporal spectrum of the model. Bottom is the spectrum of the reconstructed model. | |
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Figure 7.9 shows the effect of coarsening the space axis. Synthetic data is generated from an increasingly subsampled model. Again we notice that the phase-shift method of this chapter produces more plausible results than the simple Kirchhoff programs of chapter .
commod
Figure 9. Modeling with increasing amounts of lateral subsampling. Left is the nearest-neighbor Kirchhoff method. Right is the phase-shift method. Top has 200 channels, middle has 100 channels, and bottom has 50 channels. |
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Downward continuation |