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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.
1 Destructive waves are created in storm conditions. 2  They are created from big, strong waves when the wind is powerful and has been blowing for a long time. 3  They occur when wave energy is high and the wave has travelled over a long fetch. 4  They tend to erode the coast. They occur when wave energy is high and the wave has travelled over a long fetch. 2  They tend to erode the coast. 3  They have a stronger backwash than swash. 4  They have a short wave length and are high and steep.