Subsoil reconstruction in the Norcia plain: results of an integrated approach

In central Italy, high seismicity coexists with high exposure as this context hosts densely populated urban centers and a significant architectural and artistic heritage A detailed and multidisciplinary analysis of the subsurface not only improves our knowledge of the geodynamic context, but also effectively supports land use planning, seismic risk mitigation, and heritage protection activities The aim of this work is to define a new subsoil model, more detailed than the one currently available from literature, which is simplified and, in some cases, disagreeing about the maximum thickness of the quaternary infill of the basin This study adopts an integrated approach, combining geological, geophysical, and geotechnical data with numerical modeling techniques to reconstruct a coherent, high resolution model of the subsoil in the Norcia area In particular, the available geological and geophysical data have been collected and reprocessed, and a new HVSR measurement campaign has been conducted A numerical calibration has been then carried out on the resulting model to confirm its configuration The model obtained provides an indispensable basic knowledge for many applications, including seismic microzonation and engineering design