ROBUSTNESS OF THE H/V RATIO PEAK FREQUENCY TO ESTIMATE 1D RESONANCE FREQUENCY
作者： Sylvette Bonnefoy-Claudet , Matthias Ohrnberger , Marc Wathelet , Fabrice Cotton , Pierre-Yves Bard
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摘要: The H/V method has the potential to significantly contribute site effects evaluation, in particular urban areas. Within SESAME European project (Site EffectS assessment using AMbient Excitations) we investigate nature of ambient seismic noise order assess reliability this method. Through 1D modeling, simulate for a set various horizontally stratified structures. We perform array analysis (f-k) both vertical and horizontal synthetics estimate contribution different waves (body/surface waves, Rayleigh/Love waves) at peak frequency. show that very common assumption according which almost all energy would be carried by fundamental mode Rayleigh is not justified. proportion dependent on conditions, especially impedance contrast. However, layered media presented here, frequency always provides good resonance whatever origin (Rayleigh ellipticity, Airy phase Love S-wave resonance). also relative controls amplitude peak.
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