This paper presents the effects of geometry of sediment bedrock interface (GSBI) of 3D basins with a circular outcropping free surface on the characteristics and the focusing of the basin-generated surface (BGS) waves and associated spatial variations of the average spectral amplification (ASA) and average aggravation factor (AAF). An increase of ASA towards the centre of the semispherical (SS-...

The possibility is here explored to use an ‘equivalent’ homogeneous configuration simulate 1D seismic response of heterogeneous engineering-geological bodies when relatively weak impedance contrasts internal the (it was assumed a shear wave velocity variation between alternating layers equal 150 m/s) only exist above bedrock. This equivalent obtained by considering Vs value harmonic average act...

A novel probabilistic methodology for regional seismic site characterization is proposed and applied to a region with highly heterogeneous surficial geology varying soil sediment thickness stiffness. The method combines various sources of geological geotechnical uncertainties develop three-dimensional (3D) shear-wave velocity ( V s ) model evaluate the associated uncertainties. 3D unconsolidate...

Abstract. Past seismic events worldwide demonstrated that damage and death toll depend on both the strong ground motion (i.e., source effects) local site effects. The variability of earthquake distribution is caused by stratigraphic and/or topographic setting buried morphologies (e.g., irregular sub-interface between soft stiff soils) can give rise to amplification resonances with respect expec...

in this paper, an advanced formulation of the spectral finite element method (sfem) is presented and applied in order to carry out site response analysis of 2d topographic structures subjected to vertically propagating incident in-plane waves in time-domain. the accuracy, efficiency and applicability of the formulation are demonstrated by solving some wave scattering examples. a numerical param...

In the municipality of Enna, 80 HVSR measurements were performed, and some these combined with MASW seismic measurements, which made it possible to constrain data inversion obtain significant shear wave velocity models. A reconstruction depth bedrock was performed for whole territory, showing different depths higher lower areas, as evidenced also by Vseq parameter map. The frequency peaks ident...