What generates seismic waves in a fault, resulting in an earthquake

sudden release of stored elastic energy in rocks

Explanation:

Every Earth rock stores elastic energy, when an earthquake occurs, this elastic energy stored in Earth rocks is released. This energy sends out vibrations known as  seismic waves in faults,  that travel in all directions throughout the Earth.

This seismic waves consists of surface waves and body waves (Primary waves and secondary waves).

The  focus or hypocenter is the exact location within the earth crust were seismic waves are generated by the sudden release of stored elastic energy.

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explanation:

the atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.