Article (Scientific journals)
Estimation of the Local Seismic Amplification on an Industrialized Site in the French Rhône Valley
Gélis, C.; Cauchie, Léna; Cushing, E.M. et al.
2022In Pure and Applied Geophysics, 179 (6-7), p. 2119 - 2145
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Keywords :
messinian canyon; seismic ground motion amplification; Site effects; Surface Waves Dispersion Analysis; Geological layers; Ground-motion amplification; Messinian; Messinian canyon; Seismic ground motion amplification; Seismic ground motions; Spectral ratios; Strong ground motion; Surface wave dispersion analysis; Geophysics; Geochemistry and Petrology
Abstract :
[en] The so-called site effects caused by superficial geological layers may be responsible for strong ground motion amplification in certain configurations. We focus here on the industrialized Tricastin area, in the French Rhône valley, where a nuclear site is located. This area lies above an ancient Rhône Canyon whose lithology and geometry make it prone to site effects. This study presents preliminary measurements to investigate the local seismic amplification. We deployed three seismic stations in the area for several months: two stations were located above the canyon, the third one was located on a nearby reference rock site. The recorded seismicity was analysed using the Standard Spectral Ratio technique (SSR). The estimated amplification from weak motions reaches a value of 6 for some frequencies. These first results confirm the possibility of estimating seismic amplification using earthquakes recorded for less than one year, in this highly anthropogenic and industrialized environment, despite the local low-to-moderate level of seismicity. Noise-based SSR, that presents an obvious interest in such seismic context, shows also promising results in the area. To complement this empirical approach, we estimated the amplification using 1D wave propagation modelling. This numerical estimate is based on shear wave velocity profiles resulting from geophysical characterization campaigns. Comparison of the two approaches at low frequency, where numerical estimate is considered as the most representative, tends to suggest that edge-generated surface waves may have a strong influence in the local seismic response. This interpretation will be further investigated in the future.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Gélis, C. ;  IRSN, Fontenay-aux-Roses, France
Cauchie, Léna  ;  Université de Liège - ULiège > Département de géologie ; IRSN, Fontenay-aux-Roses, France
Cushing, E.M.;  IRSN, Fontenay-aux-Roses, France
Froment, B.;  IRSN, Fontenay-aux-Roses, France
Franco, S.;  IRSN, Fontenay-aux-Roses, France ; Ginger CEBTP, Grenoble, France
Jomard, H.;  IRSN, Fontenay-aux-Roses, France
Moiriat, D.;  IRSN, Fontenay-aux-Roses, France
Provost, L.;  IRSN, Fontenay-aux-Roses, France
Sariguzel, B.;  IRSN, Fontenay-aux-Roses, France
Tebib, H.;  IRSN, Fontenay-aux-Roses, France ; University of Strathclyde, Glasgow, United Kingdom
Language :
English
Title :
Estimation of the Local Seismic Amplification on an Industrialized Site in the French Rhône Valley
Publication date :
July 2022
Journal title :
Pure and Applied Geophysics
ISSN :
0033-4553
eISSN :
1420-9136
Publisher :
Birkhauser
Volume :
179
Issue :
6-7
Pages :
2119 - 2145
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
We warmly thank landowners and city halls to let us install our stations at BOLL, PAUL and ADHE. We greatly thank F. Hollender (CEA) for having lendt us his MASW acquisition and A. Bitri (BRGM) for having let us using his MASW processing code. This study was founded from IRSN’s own resources. We are very grateful to the two reviewers and the associate editor for their constructive comments and suggestions to improve the manuscript. This publication is dedicated to the memory of our colleague and friend Christophe Clément.This research was supported by IRSN.
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