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Confidence votes 77.6K. The basic differences are that the deep water wave spreads out and moves very quickly across open water. Wave height is not significant in these waves. When the wave reaches shallow water, however, it slows down at the leading edge.This causes the wave to bunch up and increase in height, even to dangerous proportions.he basic differences are that the deep water wave spreads out and moves very quickly across open water.
Shallow-water waves move at a speed that is equal to the square root of the product of the acceleration of gravity (9.8 m/s/s) and the water depth-let's see what this implies: In the Pacific Ocean, where the typical water depth is about 4000 m, a tsunami travels at about 200 m/s, or over 700 km/hr.ote the vastness of the area across which the tsunami travels-Japan, which is over 17,000 km away from the tsunami's source off the coast of Chile, lost 200 lives to this tsunami. Also note how the wave crests bend as the tsunami travels-this is called refraction.