surface wave

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surface wave

n.
A seismic wave that travels across the surface of the earth rather than through it. Surface waves usually travel more slowly and have larger amplitudes and longer wavelengths than body waves.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

surface wave

An earthquake wave in which rock particles vibrate at right angles to the direction of wave travel. Surface waves travel only on the Earth's surface, and not through it. Also called L wave. See Note at earthquake.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.