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: '''Seismic waves''' can be used to identify structures inside the [[Earth]] as the [[wave]]s can be [[reflect]]ed, [[refract]]ed or [[Absorb (Physics)|absorbed]] by different [[material]]s under the surface of the [[Earth]].
There are two types of '''seismic waves''':
*[[P-wave]]s - Known as [[P-wave|primary waves]] which are [[longitudinal]] [[wave]]s of [[Compression Wave|compression]] through the ground during an [[earthquake]]. These are the fastest [[Seismic Wave|seismic waves]] and can travel through both [[solid]]s and [[liquid]]s. *[[S-wave]]s - Known as [[S-wave|secondary waves]] which are [[transverse]] [[wave]]s which cause the ground to shake from side to side during an [[earthquake]]. These are slower than [[P-wave]]s and can travel through [[solid]]s but they are [[Absorb (Physics)|absorbed]] by [[liquid]]s.