As the article states, up until 2008 Oklahoma averaged 1 earthquake per year of magnitude 3.0 or greater. In 2014 there were over 500. http://earthquake.usgs.g

As the article states, up until 2008 Oklahoma averaged 1 earthquake per year of magnitude 3.0 or greater. In 2014 there were over 500. http://earthquake.usgs.gov/earthquakes/states/oklahoma/images/OklahomaEQsBarGraph.png http://earthquake.usgs.gov/earthquakes/states/oklahoma/image...