Contribution of ambient vibration recordings (Free-field and buildings) for post-seismic analysis: the case of the Mw 7.3 MARTINIQUE (French lesser ANTILLES) earthquake, november 29, 2007

Julie Regnier (1) , Clotaire Michel (2) , Etienne Bertrand (1) , Philippe Gueguen (3)

1 ERA 6 Risque sismique - Equipe recherche associée au LCPC - ERA 6 Risque sismique
2 ETH Zürich - Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich]
3 ISTerre - Institut des Sciences de la Terre

Following the Mw 7.3 Martinique earthquake, November 29th, 2007, a post-seismic survey was conducted by the Bureau Central Sismologique Français (BCSF) for macroseismic intensities assessment. In addition to the inventories, ambient vibration recordings were performed close to the particularly damaged zones in the free-field and the buildings. The objective of the paper is to show the relevancy of performing ambient vibration recordings for post-earthquake surveys. The analyses of the recordings aim at explaining the variability of the damages through site effects, structure vulnerability or resonance phenomena and to help the characterization of the post-seismic building integrity. In three sites prone to site effects, we suspect damage to be related to a concordance between soil fundamental frequency and building resonance frequency. Besides, the recordings of ambient vibrations at La Trinité hospital before and after the earthquake allow us to quantify the damage due to earthquake in terms of stiffness loss.

Mots clés: ENQUETE; RESONANCE; EFFET DE SITE; VIBRATION; DOMMAGE MATERIEL; SEISME

Domaines: Tectonique; Milieux et Changements globaux

Julie Regnier, Clotaire Michel, Etienne Bertrand, Philippe Gueguen. Contribution of ambient vibration recordings (Free-field and buildings) for post-seismic analysis: the case of the Mw 7.3 MARTINIQUE (French lesser ANTILLES) earthquake, november 29, 2007. Soil Dynamics and Earthquake Engineering, 2013, 50, pp. 162-167. ⟨10.1016/j.soildyn.2013.03.007⟩. ⟨hal-00874796⟩