108 Seismic Imaging Figure 4.14 Fold variation. Variation was from 0 to 22. The horizontal axis in the figure is the in-line direction. The vertical axis is the cross-line direction. The processing was carried out with the SPW software developed by Parallel Geoscience (Mari and Herold, 2015). The listening time was limited to 250 ms, the sampling time interval was 0.5 ms. Figure 4.15 shows a shot point example. Figure 4.15 Example of a 3D shot point. It is possible to identify the refracted wave, reflected wave, air wave and surface wave. The air wave is aliased.
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