WTF Fun Fact – Tsunamis Are Hardly Noticeable At Sea

Out at sea, a tsunami is only about 3 feet high, and could pass a boat without being noticed. As it approaches the shore, its sudden deceleration from about 500 mph to 30 mph creates the enormous wave. – WTF Fun Facts

Source: How a tsunami wave works | National Oceanography Centre (noc.ac.uk)

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