Preliminary Results of 3D Site Response Analysis in the Norcia (Italy) Sedimentary Basin
Description:
As part of the INGV project PD-GEMME, 3D physics-based numerical simulations are carried through the spectral element code SPEED (http://speed.mox.polimi.it/), with the aim of investigating seismic wave propagation features within the Norcia sedimentary basin (central Apennines, Italy). In particular, the historic town of Norcia (Nursia), which has been settled within the basin since the fifth century A.D., was recently hit by the M6.5 earthquakes that occurred on October 30th, 2016. This extensional intermountain basin, measuring about 8x4 km, is filled with Quaternary fluvio-lacustrine sediments.
In this study we focus on i) a sensitivity numerical analysis based on a preliminary simplified geological-geophysical model of the area; ii) the definition of a numerical model suitable to reproduce the basin seismic response, including non-linear effects, in the high frequency range. The first goal is achieved using a homogeneous description of the sedimentary basin, whose 3D geometry is derived from Di Giulio et al. (2020). Seismic input is given by vertical-incident Ricker-wavelets with different dominant frequencies (0.5, 1 and 2 Hz), in order to assess the accuracy of the numerical simulation in different frequency ranges and for different boundary conditions. To fulfill the second goal, and therefore to improve the knowledge on the lateral and vertical variation of velocities within the basin, a series of new site investigations have been carried out including: 5 passive seismic arrays, 4 MASW investigations and a stratigraphic borehole with undisturbed sampling, where a down-hole test is performed. The results of these investigations are combined with the available literature information, to develop a numerical model suitable to simulate ground motion with a frequency content reliable at least up to 5 Hz at each of the stations of the 3H-2009 network (Bindi et al., 2011) as well as of the other permanent and temporary networks installed in the study area.
References
Di Giulio et al. (2020) https://doi.org/10.1016/j.enggeo.2020.105501
Bindi et al. (2011) https://doi.org/10.1007/s10518-011-9273-3
Session: Accuracy and Variability of Physics-based Ground Motion Modeling [Poster]
Type: Poster
Date: 4/15/2025
Presentation Time: 08:00 AM (local time)
Presenting Author: Fernando
Student Presenter: No
Invited Presentation:
Poster Number: 86
Authors
Fernando Linsalata Presenting Author Corresponding Author fernando.linsalata@ingv.it National Institute of Geophysics and Volcanology |
Rodolfo Puglia rodolfo.puglia@ingv.it National Institute of Geophysics and Volcanology |
Antonio Costanzo antonio.costanzo@ingv.it National Institute of Geophysics and Volcanology |
Marco Massa marco.massa@ingv.it National Institute of Geophysics and Volcanology |
Sara Lovati sara.lovati@ingv.it National Institute of Geophysics and Volcanology |
Chiara Smerzini chiara.smerzini@polimi.it Polytechnic University of Milan |
Marta Pischiutta marta.pischiutta@ingv.it National Institute of Geophysics and Volcanology |
Manuela Vanini manuela.vanini@polimi.it Polytechnic University of Milan |
Stefano Parolai stefano.parolai@units.it University of Trieste |
Anna d'Onofrio anna.donofrio@unina.it University of Napoli, Naples, Italy |
Francesco Silvestri francesco.silvestri@unina.it University of Napoli, Naples, Italy |
Preliminary Results of 3D Site Response Analysis in the Norcia (Italy) Sedimentary Basin
Session
Accuracy and Variability of Physics-based Ground Motion Modeling