160 Seismic Imaging Figure 6.12 Stacked dispersion images extracted at (a) Xmid = 30 m and (b) Xmid = 110 m with picked (white error bars) and calculated (solid red lines) dispersion curves represented for the fundamental (0), the first (1), second (2), and third (3) higher modes. From Pasquet and Bodet (2017). The study of the fitting parameters, for each 1D model provided by the inversion algorithm along the acquisition line, confirmed the good quality of this model. Then, the investigation depth was evaluated for each Xmid position and finally the pseudo-2D section of the S-wave velocity was built with each 1D S-wave velocity model. The final results are shown in Figure 6.13. Figure 6.13 (a) Pseudo-2D section of S-wave velocity standard deviation computed from accepted models at each Xmid position along the line. (b) Pseudo-2D section of average S-wave velocity model computed from accepted models at each Xmid position along the line. The dashed black line corresponds to the depth of investigation estimated with an S-wave velocity model standard deviation threshold of 150 m/s. The topography extracted from airborne LiDAR data is represented with a solid black line. From Pasquet and Bodet (2017).
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