Real Data

We now provide, as an example, an image gather obtained for a real dataset. Figure 17 represents an offset ray-parameter gather at a particular horizontal location. According to the theory, in the absence of weighting, the amplitude at high p_h needs to be decreased, while the amplitude at low p_h needs to be increased.

The left panel shows the gather computed without the Jacobian weighting factor, while the right panel shows the gather after amplitude compensation. As expected, the Jacobian weighting attenuates most of the energy at high p_h, and enhances the amplitude of the reflections at lower p_h.

 

kja10.5
Figure 17 Real data example. The bottom panels are offset ray-parameter gathers computed with compensated (left) and uncompensated (right) amplitudes. The top panels show the amplitude variation with offset ray parameter for an event at about 1.75 km depth. The amplitude decrease at small incidence angles is caused by the absence of innermost offsets from the recorded data.