68 Seismic Imaging 3.1.3 Data pre-processing Typical shot-gathers and first arrival picking is shown in Figure 3.4. Figure 3.4 Example of two parallel shot-gathers. The picked first arrivals at receiver line 2 are marked with a dashed line, and at receiver line 4 with a solid line. The first-break times were picked manually, and their reliability was carefully analyzed for plausibility and erroneous travel times. Figure 3.5 Travel time azimuthal variations. Estimated refractor velocity at the base of the epikarst from surface receivers; the solid line is the fitted azimuthal model. Adapted from Galibert et al. (2014).
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