GEOLOGY

Detailed explanation-1: -P and S waves together are sometimes called body waves because they can travel through the body of the earth, and are not trapped near the surface. A P wave is a sound wave traveling through rock.

Detailed explanation-2: -Earthquakes send out seismic energy as both body and surface waves. The body waves (P and S) and surface waves recorded by a seismometer.

Detailed explanation-3: -There are two types of seismic waves, primary waves and secondary waves. Primary waves, also known as P waves or pressure waves, are longitudinal compression waves similar to the motion of a slinky (SF Fig. 7.1 A). Secondary waves, or S waves, are slower than P waves.

Detailed explanation-4: -There are three basic types of seismic waves – P-waves, S-waves and surface waves. P-waves and S-waves are sometimes collectively called body waves.