The team also found evidence of four older layers of turbidite , suggesting that such collapses have been a recurrent event since Lake Geneva formed at the end of the last Ice Age some 19,000 years ago . It is not yet known how frequently they have occurred – further investigation will be required to answer this question – but researcher Guy Simpson says , " It 's certainly happened before and I think that we can expect that it will probably happen again sometime . " Although most people 's focus has been on marine tsunamis such as the 2004 Indian Ocean tsunami and the March 2011 tsunami in Japan , lakeside cities such as Geneva , from the sea , are also at risk . Katrina Kremer notes that the risk of a fresh tsunami still exists , not just in Lake Geneva , but in other mountain lakes as well : " We have recognised that a tsunami risk applies to all lakes that have unstable slopes along the shore . " However , she warns , " the risk is underestimated because most people just do not know that tsunamis can happen in lakes . " The risk is particularly pronounced for the city of Geneva , given its position on low ground at the funnel-shaped end of the lake , which magnifies the effects of a tsunami . The impact of a new tsunami on the whole of Lake Geneva would be far more severe now than in 563 , as over a million people now live along the lake 's shores
2004 Indian Ocean tsunami
2004 Indian Ocean earthquake and tsunami
Tauredunum event