The seismic microzonation of level 3 of Sant’Agata Fossili (northern Italy) based on a multidisciplinary approach

Giuseppe Di Capua Giuseppe Di Capua,Silvia Peppoloni Silvia Peppoloni,Giuliano Milana Giuliano Milana,Vincenzo Sapia Vincenzo Sapia,Giuseppe Di Giulio Giuseppe Di Giulio,Marco Marchetti Marco Marchetti,Marco Antônio Compagnoni ,F Pergalani

doi:10.4401/ag-6363

Giuseppe Di Capua Giuseppe Di Capua, Silvia Peppoloni Silvia Peppoloni + Show 6 more

Open Access

https://doi.org/10.4401/ag-6363

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Abstract

<p>In this paper the results of a detailed seismic microzonation, performed at Sant’Agata Fossili (Piemonte region, northern Italy) are presented. We study the local seismic response of this small village using a level 3, that is the most accurate level following the Italian code of seismic microzonation. The activity steps consist in a gradual widening of knowledge of the different aspects of the amplification phenomena. A multidisciplinary approach has been performed to obtain the local seismic response: including a study of local geology, geophysical and geotechnical characterization of the lithologies, and numerical and experimental analyses. We finally compare the obtained elastic response spectra to the prescribed spectra of the Italian Building Code (in Italian: Norme Tecniche per le Costruzioni). Our results show the geologic and geophysical differences of the subsoil, that produce different local seismic response in terms of amplification factors and acceleration response spectra.</p>

Highlights

The seismic hazard is usually connected to a high building vulnerability and to significant historic values of the urban centres, especially in Italy
In the activities finalized to the assessment of the local seismic hazard and the seismic risk, the geological and geophysical studies can be considered as fundamental to perform activities of prevention and reconstruction
The results show clear resonance peaks, characterized by a f0 values varying between 2.1 Hz and 7.4 Hz in the northern and western sector of Sant’Agata Fossili, whereas, in the eastern sector, the HVNSR curves show the absence of clear resonance peaks, indicating likely the absence of a strong Vs condepth of about 40 m, whereas S2 shows an high increment of Vs at the contact between the silts and marls, a second velocity contrast is present in the lower part of the profile at a depth of approximately 30 m

Summary

Introduction

The seismic hazard is usually connected to a high building vulnerability and to significant historic values of the urban centres, especially in Italy. A multidisciplinary group has been created and the fundamental steps of the project can be summarized as follows: (1) study of local geology; (2) geophysical and geotechnical characterization of the lithologies; (3) numerical and experimental analyses to evaluate the local seismic response.

Results

Conclusion