SOLAR SYSTEM

Detailed explanation-1: -P waves travel fastest and are the first to arrive from the earthquake. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation. In rock, S waves generally travel about 60% the speed of P waves, and the S wave always arrives after the P wave.

Detailed explanation-2: -P-waves are the first waves to arrive on a complete record of ground shaking because they travel the fastest (their name derives from this fact-P is an abbreviation for primary, first wave to arrive). They typically travel at speeds between  1 and  14 km/sec.

Detailed explanation-3: -P waves, or Primary waves, are the first waves to arrive at a seismograph. P waves are the fastest seismic waves and can move through solid, liquid, or gas. They leave behind a trail of compressions and rarefactions on the medium they move through. P waves are also called pressure waves for this reason.

Detailed explanation-4: -P Waves. The first kind of body wave is the P wave or primary wave. It’s the fastest kind of seismic wave, and the first to arrive at a seismic station. P waves can move through solid rock and fluids, like water or the liquid layers of the Earth.

Detailed explanation-5: -As P-waves travel through the crust, they suddenly increase in speed at a depth of about 50km. The change in speed indicates they are entering a material of higher density than the crust. This layer is called the mantle. This boundary between the crust and the mantle is called the Moho or Mohorovocic discontinuity.