Combining Empirical Approaches to Address the Site-specific Seismic Hazard Estimation: Application to Three Populated Cities and an Area of Two Nuclear Facilities in France
Description:
Site-specific Seismic Hazard Estimates (SSHE) is a best practice for specific areas such as critical facilities or populated cities. SSHE involves taking into account the specific characteristics and seismic response behavior of the site under study as accurately as possible. However, assessing the site response over a broad frequency range and with high spatial resolution remains difficult.
We propose here a framework based on empirical approaches to estimate the site response to the spatial and frequency resolution required for SSHE. Our strategy is as follows : 1) Site response assessment for a few long-term stations with respect to the desired reference conditions using generalized GIT inversions on earthquakes. 2) Completion at low frequencies [0.05-1 Hz] by applying standard spectral ratios to the teleseism Coda SSRc. 3) Site response assessment at every station using the hybrid SSRh method on ambient noise.
In the framework of the EMISSER project, we apply it to three populated cities in France (Annecy, Grenoble and Nice) and to an industrial area in the Rhône Valley, home to two major French nuclear facilities. In each of these areas, dozens of earthquakes were recorded at a few long-term stations, and ambient noise was recorded for at least 12 hours at a dense network of dozens of seismic nodes. We report a good agreement between the GIT and SSRc site response estimates, similarly the SSRh method provides a good estimate of the site response obtained from earthquake observations. The strategy we have developed enables a coherent and high-resolution SSHE for sites of particular interest, marking a decisive first step towards mitigating seismic risks where they are prevalent.
Session: Station Installations and Site Conditions, a Quest for Improved Strong Motion Database - I
Type: Oral
Date: 4/16/2025
Presentation Time: 02:30 PM (local time)
Presenting Author: Paola
Student Presenter: No
Invited Presentation:
Poster Number:
Authors
Vincent Perron Corresponding Author vincent.perron@cea.fr French Alternative Energies and Atomic Energy Commission, University of Grenoble Alpes, Institute of Earth Sciences |
Margaux Buscetti margaux.buscetti@cea.fr French Alternative Energies and Atomic Energy Commission, University of Grenoble Alpes, Institute of Earth Sciences |
Ioannis Grendas grendasioannis@gmail.com Institute of Engineering Seismology and Earthquake Engineerits, Earthquake Planning and Protection Organization |
Fabrice Hollender fabrice.hollender@cea.fr French Alternative Energies and Atomic Energy Commission, University of Grenoble Alpes, Institute of Earth Sciences |
Isabelle Douste-Bacque isabelle.douste-bacque@univ-grenoble-alpes.fr University of Grenoble Alpes, Institute of Earth Sciences |
Remy Burlot remy.burlot@univ-grenoble-alpes.fr University of Grenoble Alpes, Institute of Earth Sciences |
Julie Regnier julie.regnier@cerema.fr Centre for Studies and Expertise on Risks, the Environment, Mobility and Urban Planning, Geoazur University of Nice |
Paola Traversa Presenting Author paola.traversa@edf.fr Electricity of France |
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Combining Empirical Approaches to Address the Site-specific Seismic Hazard Estimation: Application to Three Populated Cities and an Area of Two Nuclear Facilities in France
Category
Station Installations and Site Conditions, a Quest for Improved Strong Motion Database