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In the Pacific Ocean, where depths are typically 4000 m, the speed of a tsunami is 200 m/s or 700 km/h.
Being long, tsunamis are subject to very little diffusion; therefore, they can travel great, transoceanic distances
with very little energy loss.
Tsunamis can be generated by tectonic movement in the bottom of the seas.
As a tsunami leaves the deep water and it approaches land, it transforms.
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