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The same reason that the sea draws out a little bit before a normal wave - the higher water near the beach is drawn into the incoming wave as it "rolls" into the sand as it nears the shore. This water makes the wave rise above the undisturbed water.

A tsunami/tidal wave is just so much bigger so it removes more water from the shore.

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17y ago

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Why does low tide occur after the earthquake and before the tsunami?

It isn't low tide, but part of the wave. Each wave in a tsunami has two parts: a crest of high water and a trough of low water. In many cases the trough comes first, resulting in the water receding.


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Sometimes a tsunami can occur after an earthquake has taken place. You can know when a tsunami will occur by the way the water reacts at a beach near the ocean. The water will start to pull away from the beach faster than a tide will. When this happens, the tsunami is about to strike.


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When water at the oceans edge pulls back it is?

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The moon.


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When do low tide and high tide occur during simultaneously?

there is a high tide nimo...


When do low tide and high tide occur simultaneously?

High tide nimo