To further test the effectiveness of PS transmission migration, synthetic data were generated for a salt diapir model (Figure 3.11a). The seismograms, shown in Figure 3.12, were generated with a 2D elastic forward modeling code using a homogeneous background velocity of 3000 m/s and a salt velocity of 5000 m/s. A P-to-S velocity ratio of 2.2 is assumed for the entire model. A source was placed far below the surface (520 m) and 2700 m from the receiver well; there are no free surface reflections. Figures 3.11b, 3.11c, and 3.11d show three snapshots of the wavefield at 0.4, 0.7 and 0.8 seconds respectively. These images illustrate the presence and relative strength of the PS transmitted waves and show how complex data can become for even a simple model.