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Site-Response Assessment Using Empirical Techniques for Nuclear Sites in South-Eastern France: Comparisons With Ssr and Numerical Simulation Estimates.

Description: 

Site-specific Seismic Hazard Estimates is becoming the standard practice for critical facilities such as nuclear sites. This involves taking into account the specific characteristics and seismic response behaviour of the site under study as accurately as possible. To assess the seismic site response, Standard Spectral Ratio (SSR) or 1D (2D/3D) numerical modelling are usually used. Nevertheless, the SSR method requires choosing a reference site near the target one, and for ground motion numerical simulations, costly geotechnical and geophysical measurements are needed. Since several years, empirical approaches based on national/regional ground motion databases, such as empirical ground-motion models (GMMs) and Generalized Inversion Techniques (GITs), have proven that reliable site response could be obtained with respect to a given reference condition which does not have to be a real station located close to the target one. The aim of this work is to assess the reliability and robustness of site responses obtained using GITs and GMMs regressions techniques (site residual δS2S) for a sedimentary site located in a low to moderate seismic context (south-eastern France) where SSRs and transfer functions computed by numerical simulations (1D/2D/3D) are available. For comparisons, they are all computed with respect to the same reference station installed on outcropping rock close to the basin. Two types of generalized inversion techniques (Oth et al. 2011 and Grendas et al. 2022) and one ground motion model (Traversa et al. SSA abstract) have been used. They are based on the Epos-France database (Buscetti et al. In prep), consisting of earthquakes of M_l≥3 that have occurred in mainland France or surrounding countries. Finally, with the aim of assessing the minimum amount of data necessary to obtain reliable site responses using each technique, the original dataset has been decimated. The results will be presented in the perspective of providing a rough estimate of the minimum recording time required for seismic instruments to provide reliable site response at critical facilities.

Session: Assessing Seismic Hazard for Critical Facilities and Infrastructure – Insights and Challenges - I

Type: Oral

Date: 5/3/2024

Presentation Time: 03:00 PM (local time)

Presenting Author: Margaux

Student Presenter: Yes

Invited Presentation: 

Authors