What is a Earthquake?
Earthquake is a sudden earth movement or vibration in the crust. The scientific study and interpretation of the earthquake is known as Seismology and waves generated by the earthquake farmed as Seismic waves.
The point at which an earthquake originates is called Focus or Origin and sometimes it is several kilometers bellow the surface. The point on the earth’s crust immediately above focus is called Epicenter (this is the point where the shock waves hit first and give rise to an earthquake).