The inversion of spectral ratio H/V in a layered system using the Diffuse Field Assumption (DFA)
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Autor/esPiña-Flores, José; Perton, Mathieu; García-Jerez, Antonio; Carmona, Enrique; Luzón, Francisco; [et al.]
In order to evaluate the site effects on seismic ground motion and establish preventive measures to mitigate these effects, the dynamic characterization of sites is mandatory. Among the various geophysical tools aimed to this end, the horizontal to vertical spectral ratio (H/V) is a simple way to assess the dominant frequency of a site from seismic ambient noise. The aim of this communication is contributing to enhance the potential of this measurement with a novel method that allows extracting from the H/V the elastic properties of the subsoil, assumed here as a multilayer medium. For that purpose, we adopt the Diffuse Field Assumption from both the experimental and the modeling perspectives. At the experimental end, the idea is to define general criteria that make the data processing closely supported by theory. On the modeling front, the challenge is to compute efficiently the imaginary part of Green’s function. The Cauchy’s residue theory in the horizontal wavenumber complex plane...