The correct answer is - hypocenter.
The place deep inside the crust, where the adjustments in the crust appear, and the earthquake occurs, is called the hypocenter, also known as the focus.
The hypocenter is the place of origion of the earthquake, and the vibrations from there move in all directions. The place that is exactly above the hypocenter on the surface of the Earth is called the epicenter. From the epicenter, the vibrations move in all directions in the form of concentric circles on the surface.
