An earthquake's epicenter is the place on earth's surface directly above the focus.
reason : the epicenter lie above the focus where the disturbance starts.
when an earthquake occurs, energy radiates in all directions from its source, which is called the focus
reason : because the disturbance starts from the focus below the epicenter.
earthquakes are usually associated with faults
reason : earthquake arise from the disturbance or faults of the plates of the earth inside.