Want this question answered?
A Pwave is the first wave to arrive during an earthquake, P waves compress and then expand. They can damage buildings.
P-waves and S-waves. P waves are known as Primary waves as they have a high velocity and so are recorded at seismometer stations before Secondary or S-waves. P waves may also be known as pressure waves as they are in fact compression or longitudinal waves. S-waves may also be known as shear waves as they are transverse waves.