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Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. Out in the depths of the ocean, tsunami waves do not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases.
Soo-nam-ee (harbor wave). A tsunami has been called a tidal wave but has nothing to do with the tide. Rather, it is an unusual increase (sometimes preceded by a decrease before the first wave arrives) in sea level that floods low-lying areas and causes unusual currents in harbors and bays. tsunami is not a single wave but a series of long period waves that can cause havoc along the coastline, in harbors and bays, and move up coastal rivers. The unusual, wild oscillations of sea level caused by the tsunami can last for hours following arrival of the first wave.