SOLAR SYSTEM

Detailed explanation-1: -The direct P wave arrives first because its path is through the higher speed, dense rocks deeper in the earth. The PP (one bounce) and PPP (two bounces) waves travel more slowly than the direct P because they pass through shallower, lower velocity rocks. The different S waves arrive after the P waves.

Detailed explanation-2: -Generally, p-wave velocity increases with depth and increases with increasing rigidity of a material. Therefore p-waves travel fastest through the solid, iron inner core of Earth.

Detailed explanation-3: -Velocity of Body Waves P-waves will always travel faster than S-waves due to the way they deform the material they are traveling through and the restoring forces of that material. Its also important to understand that S-waves can’t travel through liquids.

Detailed explanation-4: -Mantle rock is generally denser and stronger than crustal rock and both P-and S-waves travel faster through the mantle than they do through the crust.

Detailed explanation-5: -The P wave propagates with a velocity of about six kilometers per second in rock, while the S wave is slower at four kilometers per second.