Key role of soil investigation and monitoring for the assessment of site effects for the village of san giuliano di puglia (Cb), Italy

We highlight the key role of subsoil investigations and seismic monitoring for the reliability of the site response analyses, referring to the well-investigated case of San Giuliano di Puglia, Italy. The 2002 Molise earthquake hit this village and its seismic response was widely examined in the past. The deployment of permanent seismic stations allowed us to check the performance of the previous models; the availability of new geotechnical data allow us formulating different subsoil models. We performed 1D and 2D site response analyses try simulating the observed response after twelve earthquakes occurred in the last years. Our analyses confirm the need of employing at least 2D models for the village site response. We observed a relatively poor performance of the models assumed in the previous studies. We obtained some improvements in the simulations adopting a stiffer shear wave velocity profile for the soil formations, constrained by the new geophysical data.