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3. The, . Seg, and . Eage, Horizontal slice at z=1.5 km. b) Cross-section at x=4 km. 14 Imaging of a channel in the overthrust model: starting velocity model. a) Horizontal slice at Z=1.5 km. b) Cross-section at X=4 km. 15 Imaging of a channel in the overthrust model: FWI velocity model after successive inversion of the 5 frequencies. a) Horizontal slice at z=1.5 km. b) Vertical section at x=4 km. 16 Imaging of a channel in the overthrust model: low-pass filtered true velocity model. a) Horizontal slice at Z=1.5 km. b) Cross-section at X=4 km. 17 Imaging of a channel in the overthrust model: comparison between vertical graphs extracted from the starting model, the low-pass filtered true model (blue solid line) and the final FWI velocity model