Deep fault lines older than the dinosaurs are being reactivated by small earthquakes . In 2011 , Oklahoma saw more earthquakes than ever before in its recorded history . The new report did not look at whether the reactivation of the faults was linked to the energy extraction technique known as fracking .
Deep fault lines older than the dinosaurs are being reactivated by small earthquakes . In 2014 , Oklahoma saw more earthquakes than ever before in its recorded history . The new report did not look at whether the reactivation of the faults was linked to the energy extraction technique known as fracking .