Three different approaches for the evaluation of reference seismic motion are presented and employed to simulate the expected ground shaking at Fabriano, A deterministic approach [Priolo, this issue], a probabilistic method [Tento, 1999] and a stochastic procedure are compared in order to supply indications for seismic zonation analysis.
Three different approaches for the evaluation of reference seismic motion are presented and employed to simulate the expected ground shaking at Fabriano, A deterministic approach [Priolo, this issue], a probabilistic method [Tento, 1999] and a stochastic procedure are compared in order to supply indications for seismic zonation analysis.
The deterministic and the stochastic approaches rely on historical investigations, that establish the April 24th, 1741 event as the maximum historical earthquake for Fabriano. The probabilistic method uses real accelerograms selected from the Italian accelerometric database, in such a way to match the shape ofthe computed Uniform Hazard Response Spectra. The obtained input motions together with the Vs profile of a site at Fabriano, are analysed by lD model to calculate the ground shaking in terms of acceleration response spectra with 5% damping.
The results are strongly dependent on the input signal: as an example, for 0.3 < To < 10.5, the deterministic approach produces spectral values about 3 times higher than those obtained by the other two procedures. In view of the main application of seismic zonation results, that is the land use planning, the probabilistic approach seems to be the most suitable for Fabriano.
Three different approac …
AUTORI: Franceschina G., Marcellini A., Pagani M. RIG ANNO: 2000 NUMERO: 2 Numero di pagina: 47
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