Whenever there’s a tsunami in the movies it’s always a 100 foot tall wall of water instead of the rolling waves we see in real life. Could a wave actually get that high and make it to land?
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That’s because the movies are unrealistic!
Tsunamis have really long wavelengths (100s of km). For a wave to break, they must reach a height that is 1/7th of the wavelength. That would require a height of 10s of km to break. Obviously that does not happen, so tsunamis do not become breaking waves and instead roll up on shore.
A breaking wave is much for dramatic so movies opt for that
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