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The two main categories of seismic waves are body waves and surface waves. Body waves can travel through the earth's inner layers, but surface waves can only move along the surface of the Earth.
The two main categories of seismic waves are body waves and surface waves. Body waves can travel through the earth's inner layers, but surface waves can only move along the surface of the Earth.
The surface waves (composed in turn of the Rayleigh and Love waves) are the slowest seismic waves.
The surface of earth is in constant motion because of forces inside the planet. These forces cause sections of earth's surface, called plates, to move.
Tectonic plates are always trying to slowly move, but they more often than not find another tectonic plate in there path of motion. After enough pressure is built up between these plates trying to move past each other, a sudden "jerk" between them happens, and the restoring force from this "jerk" causes the waves we call "seismic waves" to happen.