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They are the names given to the two types of seismic body waves released when an earthquake occurs.

P-waves are known as primary waves as they have the highest verlocity of any seismic waves and so are the first to be recorded by a seismometer and they are longitudinal or compression waves.

S-waves are known as secondary waves having a lower velocity than the P-wave and so arriving at a seismometer station after the P-waves. S-waves are transverse or shear waves.

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Q: How are P-waves and S-waves related to earthquakes?
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