Earthquake is described as the sudden motion or trembling of the Earth. The motion is caused by the release of slowly accumulated energy in rocks. What is the source of this energy? How does it accumulate in rocks? Why does it suddenly cause the Earth to shake? *
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Earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Seismic waves are produced when some form of energy stored in Earth’s crust is suddenly released, usually when masses of rock straining against one another suddenly fracture and “slip.” Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one another. The major fault lines of the world are located at the fringes of the huge tectonic plates that make up Earth’s crust.