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It's not about the Amplitude (Height) of the wave that makes Tsunami's dangerous, it's the wavelength, (the length from the front to the back of the wave). The Tsunami in the Indian Ocean that killed so many thousands was only 13 feet high.... waves twice that high hit Hawaii every day.... The difference is the wavelength of the wave. Whereas a normal wave will only have a wave length of maybe 6 to 10 feet, a Tsunami can have a wavelength miles long. The wave does not simply break on shore and stop, it keeps on coming and coming, piling up and coming inland as the water piles up behind it.
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