Site effects through numerical modelling in the Saletta damaged area of Amatrice municipality (central Italy) after the 24th August 2016, Mw 6.0 earthquake

This work presents results coming from numerical analyses in the damaged area of the Saletta hamlet, aiming at discussing factors leading to the observed damages after the 24th August 2016 Mw 6.0 earthquake and following aftershocks. After the first earthquake and during the entire seismic sequence, the area of Saletta was in fact highly struggled. Geological-technical field investigations were combined with an Electric Resistivity Tomography and several noise measurements for better evaluating the main geological-morphological variability over the study area. Following insights from the reconstructed geological setting, a continuous coring borehole was drilled and a down-hole test performed together with a passive 2D small array and an active 1D MASW measurement in order to define the subsoil shear-wave velocity model. All these data were used to obtain the dynamic model for the numerical analyses that were carried out using both 1D and 2D approaches, including linear and equivalent linear models. Results coming from 2D numerical analyses will be used to challenge the problem of the realistic ground motion estimates, evaluating any local effects able to enhance or modify the input motion. The study was funded by the Italian Department of Civil Protection (DPC) of the Presidency of Council of Ministers.