The plane wave propagates downward and a part of the energy is going back to the receivers. The data are not migrated. However, the fit is obvious. The main faults, the channels, the oxbows, and the three lenses are clearly visible. Click for more detail.
Seismic quality is very good.
Obviously, when time increases, the picture becomes blurrier. But geologic events can be followed in the plane wave seismograms until the basement. This experiment allows consideration of an approximation of acquisition design without shooting everywhere in the model. In the second experiment, sources are spread along the unconformity linking the upper part of the model to the basement. This unconformity is a horizontal plane.