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Utilité de l'instrumentation in situ : recommandations et exemples d'application pour l'évaluation des effets de site dans un contexte de sismicité faible à modérée

Abstract : ABSTRACT. Implementing an instrumentation that allows to record real seismic events is an essential complement to numerical simulation approaches of site effect assessment. Such " empirical " approaches allow for example to apply the Standard Spectral Ratio (SSR) and to evaluate the high frequencies parameter " kappa " (κ). While these approaches seem readily available in areas of high seismicity (Japan, Greece ...), they are more difficult to implement in areas of low seismicity, as in metropolitan France. The first objective of this study is to provide some elements to evaluate the usefulness of such site instrumentation, especially in the aim of site effect evaluation. A second objective is to give some recommendations for the implementation of instrumentation. This study presents the databases acquired over a period of about two years at two sites in SouthEastern France. A very large number of seismic recordings was acquired. To obtain such results, we recommend the use of velocimeters recording in continuous mode. SSR method is robust even when a limited number of events are available. It is also possible to assess the κ 0 parameter, even though the conventional method requires a good signal to noise ratio up to high frequencies. The displacement method is very encouraging to evaluate κ 0 in less seismic zones. MOTS-CLÉS : Instrumentation, sismicité faible à modérée, effets de site
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Submitted on : Sunday, March 25, 2018 - 9:09:00 PM
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Vincent Perron, Fabrice Hollender, Pierre-Yves Bard, Céline Gélis, Cédric Guyonnet-Benaize. Utilité de l'instrumentation in situ : recommandations et exemples d'application pour l'évaluation des effets de site dans un contexte de sismicité faible à modérée . 9ème Colloque National AFPS2015, AFPS / Marne-la-Vallée, Nov 2015, Marne-la-Vallée, France. ⟨insu-01742616⟩

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