106 Geophysics in Geothermal Exploration Figure 2.39 Example of MASW (after Pasquet and Bodet, 2017). Top: Extraction of single dispersion images for a 31-trace window centered at Xmid = 30 m, using shots located at (a) 0 m, (b) 10 m, (c) 50 m, and (d) 60 m. On each inset, windowed shot gathers are on the left, corresponding spectrograms are at the bottom right, and computed dispersion images are at the top right. The dashed red lines on the spectrograms and dispersion images correspond to automatic low-cut frequencies defined from the spectrogram amplitude. Bottom: 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. (a) (b) (c) (d)
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