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Rayleigh waves are a type of seismic wave that travels along the surface of a solid medium, such as the Earth. These waves are observed in seismic disturbances and are characterized by a motion that is confined to the surface layers.1

Seismic waves are vibrations generated by events like earthquakes or explosions and propagate through or along the Earth's surface. There are two main categories: body waves, which travel within the Earth, and surface waves, which travel along the surface. Rayleigh waves are a type of surface wave, named after Lord Rayleigh, who mathematically demonstrated their existence. Their motion involves both longitudinal compression and dilation, resulting in an elliptical movement of points on the surface. This elliptical motion is likely the primary cause of damage from earthquakes. Rayleigh waves typically travel at slightly over 90 percent of the speed of shear waves.234

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