10 facts about tsunamis

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And another:

• The length of the tsunami waves - tens and hundreds of kilometers; In the open ocean, a tsunami has a height less than a meter; From the tsunami water moves back and forth across the thickness ocean, down to the bottom; During the movement of the waves to the shore of its speed to a depth of 4 km of 200 m / s; In shallow water, the rate drops sharply: at a depth of 10 m speed is only 10 m / s; When you exit the shallow water the wave height increases; The smaller the pond, the stronger this effect (depth decreases, and the height of the wave increases). Therefore, reaching the shore top waves not only rises, but also seeks to topple forward. www.kabanik.ru
  
  via factroom.ru