Parametric analyses for the evaluation of the local seismic response, in small sedimentary basins, are here presented. These analyses have been performed through 1D and 2D models, with the aim to point out a quick methodology for the evaluation of local seismic hazard of sedimentary basins and to include these effects in studies of seismic hazard at regional scale.
The results of this study consist of specific tables where the amplification factor Fa is shown as depending on seismic zones, soil classes and thickness range of the deposits. The Fa related to the lithological effects was calculated for period ranges of 0.1-0.5 s, 0.5-1.0 s and 0.1-2.5 s. Moreover, for the period range 0.1-0.5 s, a specific value of DFa has been calculated to take in to account the geometrical effects of the basin. The Fa ranges allow has to define an increasing scale of the local seismic hazard suitable to single out areas characterized by different geological exposure to local seismic effects. These areas should be further analyzed at a more detailed scale.
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