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Unlike body waves, surface waves (also known as long waves, or simply L waves) move along the surface of the Earth. Surface waves are to blame for most of an earthquake's carnage. They move up and down the surface of the Earth, rocking the foundations of man-made structures. Surface waves are the slowest moving of all waves, which means they arrive the last.
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.