CNNMoney | Oklahoma earthquake and oil drilling: What we know CNNMoney When an earthquake struck Oklahoma on Saturday, one of the first steps state officials took was to shut down 37 of the state's 4,000 disposal wells -- a move that drew national attention to the link between oil and gas drilling and earthquakes. No one ... Oklahoma Earthquake Felt in Several US States, as Oil Wells Draw Scrutiny Oklahoma Shuts Down Oil And Gas Wells After Earthquake Shakes Midwest Record-tying magnitude 5.6 quake in Oklahoma oil country rattles Midwest |