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In 563 AD, during Burgundian time, a rockfall occurred in Valais, which reached the Rhone valley. This collapse of the mountain called "Tauredunum" destabilized the Rhone delta sediments, which in turn collapsed and massively slide into the Leman Lake, eventually forming a layer up to 10 m thick and a minimum volume of 0.25 km3 (Kremer and Girardclos, 2010). Numerical modeling of water movement (Kremer et al., 2012) induced by this mass of sediment predicted the formation of a tsunami on Leman lake, which is confirmed by historical sources (texts Marius Avanches and Gregory of Tours, translated into Montadon, 1925 Favrod 1991). Numerical modeling suggests that a wave height of 3 to 8 m reached Nyon and Geneva. This historical event shows that the submerged delta of the Rhone may, by the collapse of a portion of its sediment, generating a tsunami propagating across the lake.
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