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Conference Paper

Perturbations of free-field seismic recordings caused by coupling slabs, short wavelength topography and soil-structure interaction: Preliminary results from empirical studies

Authors

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

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

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

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

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

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

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

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

Douste-Bacqué,  Isabelle
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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Citation

Rischette, P., Hollender, F., Theodoulidis, N., Roumelioti, Z., Perron, V., Traversa, P., Maufroy, E., Buscetti, M., Douste-Bacqué, I., Konidaris, A. (2023): Perturbations of free-field seismic recordings caused by coupling slabs, short wavelength topography and soil-structure interaction: Preliminary results from empirical studies, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4587


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020997
Abstract
Recording ground motions is essential to estimate the seismic hazard. Signals from the databases are often considered to be in free-field, i.e. at the natural surface of the ground, without disturbances due to buildings or neighbouring structures. Nevertheless, the analysis of seismological networks has highlighted many installation modalities, including the coupling of seismometers, coexist. Recent studies have also shown that the installation conditions of these seismological stations can have a significant impact on the recorded motion, compared to true free-field measurements. Similarly, the effects of topography on a metric or decametric scale are poorly studied but also impact on the measurement at high frequency. This study focuses on a qualification of the effects of installation of seismometers, through several experiments that have been set up in Greece, mainly in Cephalonia Island, chosen for its high seismicity. The influence of the coupling methods of the seismometers is studied using the experiment called "ArgoSlab", where around thirty seismometers have been installed on slab or on seismic pillar of different size and shape, outdoor or sheltered, and compared to the recordings obtained by free-field sensors. The effect of topography at the metric and decametric scale is addressed by the analysis of about fifteen seismometers installed in the hill of Krani, near Argostoli (« ArgoScarp » experiment). Finally, the analysis of soil-structure interaction is carried out by the comparison of sets of sensors in free-field (several tens of metres from the building), very close to buildings and inside buildings (basement and top floor).