http://www.wsj.com/articles/earthquake-shakes-swath-of-midwest-from-missouri-to-oklahoma-1472906357
Oklahoma Earthquake Felt in Several U.S. States, as Oil Wells Draw Scrutiny A 5.6-magnitude earthquake rattled Oklahoma Saturday, damaging buildings and tying for the strongest temblor ever recorded in the state, which has experienced a rash of earthquake activity in the past decade that U.S. seismologists have tied to the underground disposal of wastewater from oil and gas drilling.