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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.
Which type of seismic wave is the most destructive? Surface waves cause the most damage to things like highways, bridges and buildings. Surface waves are one of four types of seismic waves generated during an earthquake.