Aggravation factors for 2D site effects in sedimentary basins: The case of Norcia, central Italy

In this article the seismic site response of Norcia basin, Central Italy, has been analyzed using both 1D and 2D ground numerical models. Period-dependent aggravation factors (PDAFs) quantifying difference between are provided for two representative cross-sections basin. Time-domain linear visco-elastic non-linear analyses were carried out by finite commercial program FLAC2D. For former, PDAFs computed a suite motion records. Although basin sediments constituted rather stiff soils, is found to produce consistent modification enhancement motion. It that most important source was generation Rayleigh waves at edges. The variability explored considering effects frequency content input motion, damping ratio, irregularity alluvial-bedrock interface. effect on also addressed with reference Mw 5 October 30, 2016 event.