One Way We Know That Tsunamis Are "Gravity" Waves and Not

question 20

Essay

One way we know that tsunamis are "gravity" waves and not "pressure" waves, is they are limited by the speed of sound.The speed of sound in ordinary ocean water is 1.5 km/sec.What is the wave speed of a tsunami in km/sec if it can move 900 km/hr in the open ocean? What mach number is this (how many times the speed of sound in water)?

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