epicenter: Common Errors in English Usage Entry for Tuesday, June 25, 2013

epicenter
The precise location where the earth slips beneath the surface in an earthquake is its hypocenter (or focus) and the spot up on the surface where people feel the quake is its epicenter. Geologists get upset when people use the latter word, designating a point rather removed from the main action, as if it were a synonym of “epitome” and meant something like “most important center.” The British spell it “epicentre.”