Séismes, tsunamis et leur calibration : cas de l’événement de Sumatra du 26 décembre 2006

Earthquakes, Tsunamis and their cross-calibration : The 26^th December 2004 case study

Institut de Recherche pour le Développement, IRD Géosciences Azur, IRD/CNRS/UPMC/UNSA, 2, quai de la Darse, – B.P. 48 – 06230 Villefranche-sur-mer.

Auteur de correspondance : Mansour.Ioualalen@geoazur.obs-vlfr.fr

Résumé

We present here features linking earthquakes and tsunamis. For a tsunamigenic earthquake, their respective informations may help as a cross-calibrating, and thus, both co-seismic displacement and tsunami propagation can be better characterized. In particular, the hydrographic information (observations or simulations) may complement seismic data in the description of the rupture process. In order to illustrate such calibration method we have considered the December 26, 2004 Sumatra/Andaman earthquake and tsunami events. An example of seismic source calibration with tide gauge records, anomalies of sea level altimetric data and tsunami modeling is reviewed. Once the calibration is satisfactory and the associated numerical simulation robust, we review that this latter one may help in the tsunami risk assessment in a pronostic mode (the Thailand case study). It may also help in a diagnostic mode in performing process studies (the Bangladesh case study).