Earthquakes are a result of a build up of pressure along plate margins. The movement of plates along the boundaries is not smooth, there is friction and the plates become stick or locked to each other as they collide, diverge and slide pass each other. When this occurs, the plates continue to move building up pressure and stored energy. Eventually, the pressure will release and the plates will snap free in a violent, jerking movement releasing the energy in seismic waves which cause the ground vibrations and earthquakes to occur.
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