The time taken for the people to run to safety when a tsunami hits (a sort of wave packet of several crests and troughs, as they enter shallow water at the shore) and there is a decrease of sea level in the harbors.

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Chapter 11, Problem 86GP

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The time taken for the people to run to safety when a tsunami hits (a sort of wave packet of several crests and troughs, as they enter shallow water at the shore) and there is a decrease of sea level in the harbors.

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