157 6. Hybrid seismic imaging Figure 6.8 (a-d) Successive stacking of the single dispersion images represented in Figure 6.7-a–d. From Pasquet and Bodet (2017). Figure 6.9 Stacked dispersion images extracted at (a) Xmid = 30 m and (b) Xmid = 110 m with picked dispersion curves (white error bars) of the fundamental (0) and first higher (1) modes. The uncertainty range is defined according to the workflow described in O’Neill (2003). Dispersion curves are limited to a frequency defined with a spectral amplitude threshold of 2.5% (dashed red line), or up to a wavelength of 50 m (dashed blue line). From Pasquet and Bodet (2017).
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