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The shallow Mw 4.9 2019 Le Teil earthquake, France: Main ground motion features highlighted by comparison with ground motion models

Authors

Laurendeau,  Aurore
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lancieri,  Maria
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rusch,  Roxanne
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Causse,  Mathieu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Cushing,  Edward
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gélis,  Céline
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hok,  Sébastien
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Laurendeau, A., Lancieri, M., Rusch, R., Causse, M., Cushing, E., Gélis, C., Hok, S. (2023): The shallow Mw 4.9 2019 Le Teil earthquake, France: Main ground motion features highlighted by comparison with ground motion models, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4388


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021819
Abstract
On November 11th, 2019, a moderate MW 4.9 earthquake occurred in Le Teil in the southeast of France, inducing significant damage (VIII on the EMS98 intensity scale in some localities). This moderate earthquake occurred at a very shallow depth of 1-2 km and induced a surface rupture up to 15 cm uplift. Good quality recordings of this earthquake are available at numerous stations well distributed around the epicentre, with the nearest station 8 km from the rupture. These recordings were analysed to highlight any specific ground motion features related to the shallow depth of the earthquake with a focus on the residuals between observations and ground motion model predictions. The first trend emerging from the residual analysis is that observations are higher than predictions at 0.5 Hz and on the contrary, they are lower above 5 Hz. Looking at the spatial distribution of residuals, we highlight that their amplitude is closely related to their location. For example, at high frequencies, residuals are lower for sites in the southeast of France, which is consistent to the first order with regional attenuation maps. Source properties and regional geological characteristics could also be explored to explain the residual amplitudes in different frequency ranges. Finally, different phenomena could be involved to explain residuals, but it is not straightforward to conclude that one factor is dominant.