Abstract

Seismic noise measurements have been carried out in the Irno Valley (Southern Italy) at seven sites characterized by different surface geology. The geology is known under the investigated sites and a one-dimensional flat-layered earth model was used to predict the ground motion spectrum for each site. A classical Haskel-Thomson approach was used to calculate theoretical transfer functions using three input motions given at the base of the layers: delta function, earthquake and noise signal recorded on the carbonate rock. Modeling shows good the agreement with experimental data, which show relevant peaks in the 2–5 Hz frequency band. This agreement justifies the hypothesis that the experimental peaks are generated by the resonance response of the uppermost layers.

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