Lake Lucerne
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Scientists study Swiss lake tsunamis

How do you prepare for tsunamis that come only every 1,000 years or so?

This is the issue Swiss geoscientists are wrestling with as they study the country's big lakes.

Some of these water bodies around the Alps have been known to experience huge waves that were driven by sub-surface landslides, which were themselves triggered by earthquakes.

Prof Flavio Anselmetti from the University of Bern describes the process to our science correspondent Jonathan Amos.

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