Application of Parametric and Non-Parametric Git in Low to Moderate Seismic Context: Case of Mainland France Earthquake Ground Motion for 1996-2021 Period.
Description:
One of the stakes in Seismic Hazard Assessment (SHA) is to develop realistic ground motion models (GMM). This requires characterizing the main components of the ground motion and their variability. In this work, we address this issue by performing spectral decomposition of the ground motion recordings into its three main contributing terms: source, attenuation and site. This is performed at the regional scale by applying an empirical approach named Generalized Inversion Technique (GIT). This method has shown reliable results in moderate to high seismicity area, with dense seismic network coverage such as Italy and Japan. However, GIT application in low to moderate seismicity context, e.g., mainland France, remains challenging due to the sparsity of earthquake recordings available in these regions. Hence, we apply here two alternative approaches of GIT: a parametric one following the algorithm implemented by Grendas et al. (2021), and a non-parametric approach developed by Oth et al. (2011), on the ground motion dataset implemented for mainland France over the period 1996-2019 by Traversa et al. (2020). This database was recently updated up to the end of 2021 (Buscetti et al., in prep.) and is composed of more than 15,000 records of earthquakes with local magnitude ML in the range 2.5 to 5.2 (with majority of ML 3.0-3.5), and epicentral distances span in the range 1 to 300 km.
Results from parametric and non-parametric inversions are discussed, as well as the limits and reliability of each approach, depending on the geometry and characteristics of the dataset used. This work is a first step in the improvement of the seismological models for mainland France. It will contribute to constraining empirical region and site-specific GMM and ground motion simulations, and thus to improve their representativity for low to moderate seismicity areas. These results allow improving the understanding of ground motion contributions and variability in a low to moderate seismicity region as mainland France.
Session: From Sensors and Networks to Site Characterization and Site Response: Coming Full Circle [Poster]
Type: Poster
Date: 4/18/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Margaux Buscetti
Student Presenter: Yes
Invited Presentation:
Authors
Margaux Buscetti Presenting Author Corresponding Author margaux.buscetti@cea.fr French Alternative Energies and Atomic Energy Commission, DEN, Cadarache |
Paola Traversa paola.traversa@edf.fr Electricity of France |
Vincent Perron vincent.perron@cea.fr French Alternative Energies and Atomic Energy Commission |
Fabrice Hollender fabrice.hollender@cea.fr French Atomic Energy Commission, ISTerre, University Grenoble Alpes |
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Application of Parametric and Non-Parametric Git in Low to Moderate Seismic Context: Case of Mainland France Earthquake Ground Motion for 1996-2021 Period.
Category
From Sensors and Networks to Site Characterization and Site Response: Coming Full Circle