The earthquake in ordinary language means: The vibration of the earth. Because of the sudden movement of the crustal plates, the sequence of shocks occurring at some point in crust or mantle is called earthquake. Earthquake is a natural phenomenon in which waves emerge due to the release of energy, which spreads in all directions causing destruction.
Origin of earthquake: On the surface, crust is often the source of energy on the edge of fault. The crustal (tectonic) plates move and collides with one another, sometime causing faults at impact sites. When the plates dis – enage, huge amounts of energy are released. The slabs on either side of the fault move in the opposite direction, where the top rocks hold the static with the pressure, and the friction between them keeps them interlocked. In spite of this, due to the tendency of separation, the impact of friction decreases.
As a result, the rock clusters suddenly collapse in opposite directions. As a result, energy waves emerge and become dynamic in all directions. These energy waves reach the surface in different directions, consequently the vibrations begin. Thus, earthquake originates.