Seismic characterization of shallow bedrock sites with multimodal Monte Carlo inversion of surface wave data |
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| Authors: | Paolo Bergamo Cesare Comina Sebastiano Foti Margherita Maraschini |
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| Institution: | 1. DISTR—Dipartimento di Ingegneria Strutturale e Geotecnica, Politecnico di Torino, C.so Duca degli Abruzzi, 24 10129 Torino, Italy;2. DST-Dipartimento di Scienze della Terra, Universitá degli Studi di Torino, via Valperga Caluso, 35 10125 Torino, Italy |
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| Abstract: | Sites with a limited overburden over a stiff basement are of particular relevance for seismic site response. The characterization of such stratigraphies by means of surface wave methods poses some difficulties in interpretation. Indeed the presence of sharp seismic contrasts between the sediments and the shallow bedrock is likely to cause a relevance of higher modes in the surface wave apparent dispersion curve, which must be properly taken into account in order to provide reliable results. In this study a Monte Carlo algorithm based on a multimodal misfit function has been used for the inversion of experimental dispersion curves. Case histories related to the characterization of stations of the Italian accelerometric network are reported. Spectral ratios and amplification functions associated to each site are moreover evaluated to provide an independent benchmark test. The results show the robustness of the inversion method in such non-trivial conditions and the possibility of getting an estimate of uncertainty related to solution non-uniqueness. |
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