GEOLOGY

Detailed explanation-1: -Surface waves are larger in amplitude and longer in duration than body waves. These waves arrive at seismograph after the arrival of P-and S-waves because of their slower velocities.

Detailed explanation-2: -The primary, or P, waves travel most quickly and are the first to be registered by the seismograph. Secondary, or S, waves travel more slowly. As S waves have a greater amplitude than P waves the two groups are easily distinguishable on the seismogram.

Detailed explanation-3: -Although surface waves travel more slowly than S-waves, they can be much larger in amplitude and can be the most destructive type of seismic wave. There are two basic kinds of surface waves: Rayleigh waves, also called ground roll, travel as ripples similar to those on the surface of water.

Detailed explanation-4: -The highest part of the wave is called the crest. The lowest part is called the trough. The wave height is the overall vertical change in height between the crest and the trough and distance between two successive crests (or troughs) is the length of the wave or wavelength.