Amplification of the ground motion in a topographic irregularity is generally linked to the focalization of seismic waves at its topmost part due to the existence of diffraction, reflection, and conversion of the incident waves (Bard 1982). The amplification effects at the topmost part of a hill are frequency-dependent so that resonance phenomena occur when the wavelength of the incident wave is comparable to the horizontal dimension of the hill. In addition, the influence of the topography on ground motion is linked to the sharpness of the ridge crest (Géli et al. 1988; Bard and Riepl-Thomas...

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