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Japan Tsunami 2011-Ocean Overtops Wall

Tsunami waves do not resemble normal sea waves, because their wavelength is far longer.
Rather than appearing as a breaking wave, a tsunami may instead initially resemble a rapidly rising tide,
and for this reason they are often referred to as tidal waves.
Tsunamis generally consist of a series of waves with periods ranging from minutes
to hours, arriving in a so-called "wave train". Wave heights of tens of metres can be
generated by large events. Although the impact of tsunamis is limited to coastal areas,
their destructive power can be enormous and they can affect entire ocean basins.



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