Actually its spectrum is only approximately white because the spectrum is smoothed before it is divided out. This is because of the nonsymmetric brightness histogram of natural wood. The synthetic data fails to segregate the two dips into a checkerboard pattern. Synthetic brick edges are everywhere and do not enclose blocks containing a fixed color. A spectacular failure of the stationarity assumption.
All dips are present but in different locations.
WGstack Figure 7 Gulf of Mexico seismic section, modeled, and deconvolved. The deconvolution suppresses the strong horizontal layering giving a better view of the hyperbolas.