109 4. Near-surface reflection surveying The processing sequence of each shot includes: amplitude recovery, deconvolution in the 15-150 Hz frequency bandwidth, tail mute, and static corrections (Figure 4.16). The deconvolution was carried out to increase the resolution and attenuate the surface waves. A tail mute was used to eliminate air waves and surface waves. The static corrections were performed to compensate the effects of the weathering zone. In the example, the 3D static corrections are very weak. Figure 4.16 Some processing steps. Top: example of a raw shot before and after tail mute; bottom: example of 3D shot point before and after deconvolution; left: near offset 3D shot point. The shot point is shot number 1 on line 1; right: far offset 3D shot point. The shot point is shot number 6 on line 11. A reflected event is clearly visible at 100 ms, after deconvolution.
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