32 Seismic Imaging a b c d e f Figure 1.8 wave separation - In line shot point (a) raw data, (b) direct wave and slow Rayleigh wave, (c) fast Rayleigh wave, (d) converted refracted waves, (e) refracted wave, (f) reflected waves (Normalised displays). Figure 1.9 is an example of wave separation by wavenumber filters. The example shown is based on a VSP (Vertical Seismic Profile; Mari and Vergniault, 2018) data set. From top to bottom, this figure shows: • Raw data, • Downgoing wavefield associated with positive wavenumbers, • Upgoing wavefield associated with negative wavenumbers.
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