Tsunami are difficult to measure because many factors, such as shape of ocean floor, shape of coast, size and location of earthquake generating the tsunami, can effect their size and destructive potential. Often tsunami are measured after the event by looking at the damage. However, like earthquakes, a comparison of intensity can give an idea of the destructive potential. There is a loose chart in the first citation below. A “Tsunameter” has been developed in recent years and is defined as: A piece of equipment used to detect tsunamis, deployed across the open ocean to form a network for the purpose of early warning. It’s effectiveness is still up for debate.
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