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Effects of Love Waves on Microtremor H/V Ratio

Institut de Radioprotection et de Sureté Nucléaire, BP 17, 92262 Fontenay-aux-Roses, Cedex, France

Andreas Köhler

Institute of Geosciences, Potsdam University, Karl-Liebknecht-Str. 24, Haus 27, 14476 Potsdam, Germany

Cécile Cornou, Marc Wathelet and Pierre-Yves Bard

Laboratoire de Géophysique Interne et de Tectonophysique, Institut de Recherche et de Développement, Laboratoire Central des Ponts-et-Chaussées, Maison des Géosciences, Joseph Fourier University, BP 53, 38041 Grenoble Cedex 9, France

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 1D 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 1D horizontally layered structures presented here, the H/V peak frequency always provides a good estimate of the fundamental resonance frequency whatever the H/V 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.

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