surf ace wave

surface wave

noun Geology.
a seismic wave that travels along or parallel to the earth's surface (distinguished from body wave ).
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Science Dictionary
surface wave  
A seismic wave that travels across the surface of the Earth as opposed to through it. Surface waves usually have larger amplitudes and longer wavelengths than body waves, and they travel more slowly than body waves do. love waves and Rayleigh waves are kinds of surface waves. Compare body wave. See Note at earthquake.
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