What causes the shaking that is associated with earthquakes?

a. fault zones
b. elastic rebound
c. epicenters
d. deformation

Fault zones cause Earthquakes causes the shaking that is associated with earthquakes

Explanation:

An Earthquake takes place whenever the underground rocks break in the fault zone suddenly. While they break they release an energy that generates seismic waves causing the shake of the Earth ground.  

While the rocks get rubbed against each other it sticks and creates pressure, this pressure breaks the rocks and Earthquake take place. The rocks break in the focus zone of the Earthquake and the shaking is caused by the fault zone.

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