Dense Seismic Noise Measurements for the Assessment of Site Response Variabilities: Application to a Liquefiable Site in the Po Plain
Description:
The seismic response of a site depends mainly on local soil characteristics; however, a strong seismic motion can induce nonlinear soil behavior, which in turn can modify the site response. The nonlinear soil behavior may lead in some cases to soil liquefaction. In northern Italy, following the two Emilia earthquakes of May 2012 (Mw of 6.1 and 5.9), widespread surface liquefaction of silty sands was observed in the Po Plain. A temporary accelerometric station, SAN0, was installed in San Felice sul Panaro and recorded potential nonlinear soil behavior during the second earthquake. Moreover, slight evidence of soil liquefaction was observed a few meters from the station and more signs were noted several hundred meters to the south of the station. Despite various geotechnical investigations conducted around the station, a significant gap remains in the comprehensive characterization of site response variability and shear wave velocity (Vs) profiles at the city scale, which are essential for understanding local seismic responses.
To address this gap, we carried out an extensive seismic campaign at the site thanks to the Transnational Access of the Italian Project "MEET - Monitoring Earth's Evolution and Tectonics" (https://meet.ingv.it/bandi/transnational-access). It involved deploying 43 of individual stations across the city, including in areas with dense evidence of liquefaction. Moreover, five arrays of ambient vibration recordings with radii of 50, 100, 200, 300, and 400 meters were deployed, each consisting of five stations centered around the seismic station SAN0. Initial analysis was conducted using the Horizontal-to-Vertical Spectral Ratio (H/V) and the Ambient Vibration Array (AVA) methods. These techniques are well-established for identifying site response variability and characterizing the shear wave velocity profile of the subsurface. Additionally, this study explored day-night variations in seismic noise, highlighting the influence of environmental and anthropogenic factors.
Session: Data-driven and Computational Characterization of Non-earthquake Seismoacoustic Sources [Poster]
Type: Poster
Date: 4/16/2025
Presentation Time: 08:00 AM (local time)
Presenting Author: Joya
Student Presenter: Yes
Invited Presentation:
Poster Number: 72
Authors
Joya El Hitti Presenting Author Corresponding Author joya.el-hitti@cerema.fr Centre for Studies and Expertise on Risks, the Environment, Mobility and Urban Planning |
Julie Régnier julie.regnier@cerema.fr Centre for Studies and Expertise on Risks, the Environment, Mobility and Urban Planning |
Giovanna Cultrera giovanna.cultrera@ingv.it National Institute of Geophysics and Volcanology |
Giuseppe Di Giulio giuseppe.digiulio@ingv.it National Institute of Geophysics and Volcanology |
Luca Minarelli luca.minarelli@ingv.it National Institute of Geophysics and Volcanology |
Céline Gélis celine.gelis@irsn.fr Institut de Radioprotection et de Sûreté Nucléaire |
Luca Lenti luca.lenti@cerema.fr Centre for Studies and Expertise on Risks, the Environment, Mobility and Urban Planning |
Philippe Langlaude philippe.langlaude@cerema.fr Centre for Studies and Expertise on Risks, the Environment, Mobility and Urban Planning |
Michel Pernoud michel.pernoud@cerema.fr Centre for Studies and Expertise on Risks, the Environment, Mobility and Urban Planning |
José Ignacio Bustos jose.bustos.f@ug.uchile.cl Paris Institute of Earth Physics, Paris, France |
Alessandra Schibuola alessandra.schibuola97@gmail.com University Gustave Eiffel, Paris, France |
Gaetano Riccio gaetano.riccio@ingv.it National Institute of Geophysics and Volcanology, Rome, Italy |
Dense Seismic Noise Measurements for the Assessment of Site Response Variabilities: Application to a Liquefiable Site in the Po Plain
Session
Data-driven and Computational Characterization of Non-earthquake Seismoacoustic Sources