Question

what are P waves and S waves

Answer 1

In a earthquake the first kind of wave is the P wave or primary wave. This is the fastest kind of seismic wave, and, consequently, the first to 'arrive' at a seismic station. The P wave can move through solid rock and fluids, like water or the liquid layers of the earth. It pushes and pulls the rock it moves through just like sound waves push and pull the air. Have you ever heard a big clap of thunder and heard the windows rattle at the same time? The windows rattle because the sound waves were pushing and pulling on the window glass much like P waves push and pull on rock. Sometimes animals can hear the P waves of an earthquake. Dogs, for instance, commonly begin barking hysterically just before an earthquake 'hits' (or more specifically, before the surface waves arrive). Usually people can only feel the bump and rattle of these waves.

The second type of wave is the S wave or secondary wave, which is the second wave you feel in an earthquake. An S wave is slower than a P wave and can only move through solid rock, not through any liquid medium. It is this property of S waves that led seismologists to conclude that the Earth's outer core is a liquid. S waves move rock particles up and down, or side-to-side--perpindicular to the direction that the wave is traveling in (the direction of wave propagation)

Answer 2

Answer:

P waves are also called Prime ways or Push waves, travel the first to arrive. Travelling at an average speed of 6 km per/s, these waves cause relatively smaller displacement (low tremors).

S waves are also called Secondary waves or Shake waves, arrive the next, moving at lesser speeds than the P waves. These waves produce a strong shaking effect. These do not pass through liquids.

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