Data were generated using SEPlib Kirmod3d program. The reflectivity map simply consists of a set of gradually dipping planes, from zero dip to . The azimuth of the planes is with respect to the direction of the acquisition, which maximizes problems in imaging.
Figure 7 Geometry of the set of slanted planes, dipping at , , , and towards increasing x and y, at with respect to the in-line direction.
Data generated are on a regular grid and are common-azimuth, that is, with no cross-line offset component. The geometry of the grid is illustrated in Figure 8, with 64 samples in cmp-x and cmp-y, 128 in offset.
We used a very fine time sampling (1 ms) in order to minimize interpolation errors during modeling with Kirmod3d and sub-sampled data to 2ms afterwards. We generated Green functions with velocity law v(z)=1500+0.5z, which roughly corresponds to typical gradients found in the Gulf of Mexico.