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S waves

  • These are shear waves .
  • The motion of the medium is perpendicular to  direction of propagation of the wave .
  • They can propagate only through solids and not through gases or liquids .
  • S waves are larger .
  • They travel with less speed .

P waves

  • These are compression waves .
  • These waves produces a force along the direction of propagation .
  • They can propagate through solids, gases and liquids.
  • P waves are smaller than s waves .
  • They travel with 60% greater speed than S waves .

P-waves travel 60% faster than S-waves on average because the interior part of the Earth does not react the same way as the s wave and P wave.

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