Reference Terms
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Seismic wave

A seismic wave is a wave that travels through the Earth, most often as the result of a tectonic earthquake, sometimes from an explosion.

There are two types of seismic wave, namely, 'body wave' and 'surface wave'.

There are two kinds of body waves: primary (P-waves) and secondary (S-waves).

Surface waves are analogous to water waves and travel just under the Earth's surface.

They travel more slowly than body waves.

Note:   The above text is excerpted from the Wikipedia article "Seismic wave", which has been released under the GNU Free Documentation License.
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August 2, 2015

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