81 3. Seismic tomography seismograms computed with the elastic images provided by the tomography, and in Figure 3.15 the residual data, i.e. the difference between field and computed seismograms. There is observable evidence of some major P-P and P-S events in the field data also present in the synthetic seismograms. The underlined P upgoing arrival (on the Z-component) and S upgoing arrival (on the X-component) are particularly recognizable, see Figures 3.12 and 3.15. Figure 3.14 Two-component (X, Z) synthetic VSP using P-P and P-S scattered waves from elastic images in Figure 3.13. Adapted from Beydoun et al. (1990). Figure 3.15 Residual data (i.e., the difference between the data in Figures 3.12 and 3.14). The box represents the part of the data covered by the rectangular area under study. The comparison between the black underlined P upgoing arrival (on the Z-component) along with the S upgoing arrival (on the X-component) in Figure 3.12, with those of this figure confirms the high quality of the tomography. Adapted from Beydoun et al. (1990).
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