Bonnefoy Claudet S. auteur aut IRD Kohler A. auteur aut IRD Cornou Cécile auteur aut IRD Wathelet M. auteur aut IRD Bard P. Y. auteur aut IRD text journalArticle eng text/pdf born digital access The horizontal-to-vertical (H/V) method has the potential to significantly contribute to site effects evaluation, in particular in urban areas. Within the European project, site effects assessment using ambient excitations (SESAME), we investigated the nature of ambient seismic noise in order to assess the reliability of this method. Through ID seismic noise modeling, we simulated ambient noise for a set of various horizontally stratified structures by computing efficiently the displacement and stress of dynamic Green's functions for a viscoelastic-layered half-space. We performed array analysis using the conventional semblance-based frequence-wavenumber method and the three-component modified spatial autocorrelation method on both vertical and horizontal components and estimated the contribution of different seismic waves (body/surface waves, Rayleigh/Love waves) at the H/V peak frequency. We show that the very common assumption that almost all the ambient noise energy would be carried by fundamental-mode Rayleigh waves is not justified. The relative proportion of different wave types depends on site conditions, and especially on the impedance contrast. For the ID horizontally layered structures presented here, the H/V peak frequency always provides a good estimate of the fundamental resonance frequency whatever the FIN peak origin (Rayleigh wave ellipticity, Airy phase of Love waves, S-wave resonance). We also infer that the relative proportion of Love waves in ambient noise controls the amplitude of the H/V peak. specialized 064 98 1 288-300 2008 0037-1106 https://www.documentation.ird.fr/hor/fdi:010083625 10.1785/0120070063 0037-1106 [F B010083625] https://www.documentation.ird.fr/hor/fdi:010083625 https://www.documentation.ird.fr/intranet/publi/2021-11/010083625.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2008-03-31 2021-11-29 fdi:010083625 fre