Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
08 May 2013
Review status
This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.
Tsunami hazard in La Réunion island from numerical modeling of historical events
E. Quentel1, A. Loevenbruck1, H. Hébert1, and S. Allgeyer1,* 1CEA, DAM, DIF, 91297 Arpajon, France
*now at: The Australian National University, Research School of Earth Sciences, Canberra 0200, Australia
Abstract. Whereas major tsunamis have recently affected the southwest Indian Ocean, tsunami hazard in this basin has never been thoroughly examined. Our study contributes to fill in this lack and focuses on La Réunion island for which tsunami hazard related to great earthquakes is evaluated by modeling the scenarios of major historical events. Then, our numerical modeling allow us to compare the tsunami impact at regional scale according to the seismic sources; we thus identify earthquakes locations which most affect the island and describe the impact distribution along its coastline. Thirdly, detailed models are performed for selected sites based on high resolution bathymetric and topographic data; they provide estimations of the water currents, wave heights and potential inundations. When available, field measurements and tide records allow testing our models. Arrival time, amplitude of the first wave and impact on the tide gauge time series are well reproduced. Models are consistent with the observations. The west coast of La Réunion is the most affected (to 2.7 m in the harbour of Le Port Est for 2004 event) by transoceanic tsunamis. Numerical modeling has been performed at Saint-Paul for the 2004 Sumatra-Andaman event and 1833 Sumatra event; the low topography of this town could make it vulnerable to tsunami waves. Harbours, particularly prone to undergo significant damages, are also examined. Outside the harbours as well as at Saint-Paul, inundations are predicted along the coastline due to important local wave heights (> 2.5 m).

Citation: Quentel, E., Loevenbruck, A., Hébert, H., and Allgeyer, S.: Tsunami hazard in La Réunion island from numerical modeling of historical events, Nat. Hazards Earth Syst. Sci. Discuss.,, in review, 2013.
E. Quentel et al.
E. Quentel et al.


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