How do scientists predict tsunamis?
In the moments after an earthquake, seismologists consult pressure sensors on the ocean floor to determine whether there has been an increase in the height of the column of water directly above. They then consult topographical maps to predict, based on historical data and mathematical models, how quickly and powerfully the tsunami might impact various parts of the world. Seismologists issue a "warning" if a tsunami has been detected and is likely to head for a given landmass. ChaCha
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