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A CATALOG OF TSUNAMIS IN LA RÉUNION ISLAND FROM AUGUST 27TH, 1883 TO OCTOBER 26TH, 2010

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Author(s): Alexandre Sahal | Julie Morin | François Schindele | Franck Lavigne

Journal: Science of Tsunami Hazards
ISSN 8755-6839

Volume: 30;
Issue: 3;
Start page: 178;
Date: 2011;

Keywords: tsunamis | teletsunamis | Indian Ocean | La Réunion | catalog

ABSTRACT
The PREPARTOI project (“Prevention and research for the mitigation of the tsunami risk in the French territories of the Indian Ocean”, the French acronym equivalent to « get-ready »), began in early 2010. The first stage of this integrated tsunami risk assessment project consisted in evaluating the tsunami hazard on La Réunion Island by collecting and synthesizing all available data about past tsunamis and their effects. This first step was implemented through archive and field research during 2010. Seven tsunami occurrences were identified as having impacted La Réunion Island between 1883 (explosion of the Krakatau volcano) and October 2010 (end of the field research). All these events had sources along the Indonesian margin and were triggered by earthquakes of magnitude higher or equal to Mw=7.7, affecting the island with maximal runups reaching 7m. These tsunamis mostly affected the harbors damaging many boats, especially in 2004. Although historically the tsunami hazard is quite moderate on the island’s coasts, the high concentration of people along the shore and in low elevation areas, highlights considerable stakes and high vulnerability resulting in significant risk, especially in Saint-Paul, a city which was completely flooded in 1883.
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