Friction between plates causes pressure to build which is released as fractures at faults. The energy released is seismic waves.Pressure is released from the focus or hypocentre. The point on which the Earth's surface is above the focus is the epicentre.Seismic waves radiate from the focus.

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1.
Friction between plates causes pressure to build which is released as fractures at faults. The energy released is seismic waves.

Pressure is released from the focus or hypocentre. The point on which the Earth's surface is above the focus is the epicentre.

Seismic waves radiate from the focus.