Science & TechFact

A tsunami in open sea is one metre tall and faster than a jet.

In the deep ocean a tsunami races at over 800 km/h yet stands only about one metre high, with a wavelength of up to 200 kilometres. A ship never notices it. Near the coast shallow water slows it to under 80 km/h, the wave compresses to under 20 kilometres and grows enormously in height instead.

Useful: If the sea suddenly pulls far back, that is a tsunami warning: head for high ground immediately.

Source: en.wikipedia.org

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