Why do tsunamis (20~ft) cause more damage and flooding than the waves that surfers surf (world record 86ft)?
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As you may know any object has inertia. If it flies in one direction it will try to keep flying in that direction.
A large way has some volume of water, hits the surface of a beach and dissiptes its energy and the. Flows back into the ocean. It‘s just a surface level phenomenon.
A tsunami is far more. It‘s not just a wave. Its all the water underneath that wave that is moving along with it. Theres probably cubic kilometers of water moving towards a coast. And when it hits the coast, all that moving mass keeps going.
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