When the earthquake occurred. The energy released is in the form of seismic waves, 2 types.
The medium wave band, to prove it: a moving, spreading evenly from all sides the earthquake Center. And travelling in waves moving through the waves in the medium. Divided into 2 types.
Primary wave P waves: or. a longitudinal wave. The particles of the medium in which the wave moving through the primary would move in the same direction as the direction of motion of the wave. Primary waves are faster than other types of waves. And can move through a solid medium, liquid. And gas.
The secondary wave or waves.: S is a transverse wave. The particles of the medium in which the wave-motion moves perpendicular to the direction of motion of the wave. The secondary waves can move through a solid medium-specific. And are the primary wave.