Ground Motion Models Uncertainties and Variability: The Impact of Seismic Station Installation Conditions and Earthquake Catalog Quality
Description:
In the framework of ground motion and seismic hazard assessment and particularly in low to moderate seismic activity regions, the use of locally recorded ground motions has recently gained in popularity, for example in adjusting existing Ground Motion Models (GMM) developed in other regions of the world or in developing non-ergodic models. However, in low-to-moderate seismicity regions as continental France, available ground motion recordings are mostly related to small magnitude earthquakes, for which the information associated to the earthquake source parameters (3D location and magnitude) is often affected by large uncertainties. Moreover, information about seismic station installation conditions (housing, type of soil-sensor coupling…) is most often lacking in ground motion databases worldwide, and ground motion developers generally assume that sensors are installed in free-field.
In this context, with the objectives of exploring possible biases and robustly characterizing GMM variabilities, this work illustrates the benefit of both, accounting for seismic station installation conditions and disposing of a good quality earthquake catalog in the development of empirical ground motion models. A simple GMM based on EPOS-France ground motion dataset (Buscetti et al., subm.) is developed exploiting available information on the sensor installation conditions and using earthquake catalogs of different quality. The results highlight that a significant portion of the site-related variability in GMMs is related to the impact of the variety of sensor installation modalities and that inaccuracies in the earthquake catalogs can be responsible for potential biases in GMMs event-related variability. Accounting for these metadata allows to improve the characterization of the GMM variability and, overall, to contribute to the improvement of seismic hazard studies accuracy in low-to-moderate seismicity countries.
Session: From Earthquake Recordings to Empirical Ground-Motion Modelling - II
Type: Oral
Date: 5/2/2024
Presentation Time: 11:15 AM (local time)
Presenting Author: Paola
Student Presenter: No
Invited Presentation:
Authors
Paola Traversa Presenting Author Corresponding Author paola.traversa@edf.fr Électricité de France |
Margaux Buscetti margaux.buscetti@cea.fr French Alternative Energies and Atomic Energy Commission |
Pierre Arroucau pierre.arroucau@edf.fr Électricité de France |
Sreeram Kotha sreeram-reddy.kotha@univ-grenoble-alpes.fr Université Grenoble Alpes |
Fabrice Hollender fabrice.hollender@cea.fr French Alternative Energies and Atomic Energy Commission |
Pauline Rischette pauline.rischette@cea.fr French Alternative Energies and Atomic Energy Commission |
Vincent Perron vincent.perron@cea.fr French Alternative Energies and Atomic Energy Commission |
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Ground Motion Models Uncertainties and Variability: The Impact of Seismic Station Installation Conditions and Earthquake Catalog Quality
Category
From Earthquake Recordings to Empirical Ground-Motion Modelling