GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.1 - POSTER GNGTS 2023 Figure 2. (a) Geolithological map of the MASS area (Bosse et al., 1978). (b) 2D Subsoil Model. Figure 3. Acceleration response spectra for the (a) control point 1, (b) control point 2. Results showed amplifications at long periods that can affect tall buildings (actually affected after the considered seismic events). Concluding remarks This study showed the relevant role in seismic amplification of the subsoil model according to the thicknesses of the layers of Tierra Blanca Joven (TBJ) and Tierra Blanca (TB2) (with their low seismic wave velocities and their high heterogeneity), which undergo significant variations along the section. They are able to amplify the seismic motion on the surface in differentiated ranges of periods. In particular, it is possible to recognize the contribution of the shallower layers of the TB and TBJ deposits and that of the deeper ones (TB3 and MASS) on the amplification of the surface motion. This work also highlights that, as the thickness of the deep layers increases (having higher seismic velocities than the more superficial deposits), they can be considered responsible for the shift of the amplification towards shorter periods (high frequencies). Acknowledgments The authors would like to recognize the scientific cooperation from the Ministry of Environmental and Natural Resources (MARN) of El Salvador. This study has been developed by the CASTES project, founded by the Italian Agency for Development Cooperation (AICS).