Hypocenternoun
(US) lang=en
Hypocenter
A hypocenter (or hypocentre) (from Ancient Greek: ὑπόκεντρον [hypόkentron] for 'below the center') is the point of origin of an earthquake or a subsurface nuclear explosion. In seismology, it is a synonym of the focus.
Epicenternoun
(US) lang=en
Epicenternoun
the point on the Earth's surface directly above the focus of an earthquake
Epicenter
The epicenter, epicentre () or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates.