Topical Terminology > S (Secondary Or Shear) Waves
1 Definition
S (Secondary or shear) waves
For S (Secondary or shear) waves we have a term and definition in Earthquake.
S (Secondary Or Shear) Waves (Earthquake) 
S waves oscillate the ground perpendicular to the direction of wave travel. They travel about 1.7 times slower than P waves. Because liquids will not sustain shear stresses, S waves will not travel through liquids like water, molten rock, or the Earth's outer core. (USGS National Earthquake Information Center, 1998)
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