According to the NewsOK, the U.S. geological reported that an earthquake of magnitude 4.2 hit central Oklahoma Wednesday evening and again an hour later with a 3.2 magnitude. Then on Thursday, a 2.5 magnitude earthquake hit near the town of Arcadia followed by a 2.8 magnitude earthquake immediately after. When I first read the article, I came across the term "epicenter" and believed that it was the name of a stadium in Oklahoma. My next thought was that "there really must not be too much to do in a desolate state like Oklahoma if their "State's Most Trusted News" reports how far away a rare earthquake was to its treasured sports stadiums." Once I came to realize that my ignorance had lead me to believe this conclusive thought, I looked up epicenter and learned it is a geological term for the point on the surface of the Earth above the focus of the underground earthquake.

http://newsok.com/small-earthquakes-rattle-arcadia-luther/article/3518457
http://en.wikipedia.org/wiki/Epicenter
http://www.glynn.k12.ga.us/BHS/Juniorprojects/Hopkins01/miguelo23724/Epicenter.gif