The epicenter, epicentre (/ˈɛpɪsɛntər/) 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.
It gonna be Primary because of what question asked
1 : a secret look She took a sneak peek at the birthday presents hidden in the closet. 2 : a brief showing We saw a sneak peek of the movie that will be released next month. Good luck on your assignment bro ~ JyMarkus