Question

Causes of earthquake?

Answer 1

The short answer is that earthquakes are caused by faulting, a sudden lateral or vertical movement of rock along a rupture (break) surface. 

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little.

Answer 2

There are many causes of earthquake:
1.collision of two plates under the earth crust.
2.volcanic eruption
3.earthquakes are generally caused when rock underground suddenly breaks along the fault.