Why does the water level drop before the tsunami hits? Because it is like a tide, the tide goes out before it comes in. ... As the tsunami approaches water is drawn back from the beach to effectively help feed the wave. In a tide the wave is so long that this happens slowly, over a few hours.
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Why does the water level drop before the tsunami hits? Because it is like a tide, the tide goes out before it comes in. ... As the tsunami approaches water is drawn back from the beach to effectively help feed the wave. In a tide the wave is so long that this happens slowly, over a few hours.