Oklahoma has experienced thousands of earthquakes in recent years. Most of them have been traced to hydraulic fracturing, or fracking, a process in which large amounts of chemically treated water is pumped deep into the earth to help extract oil and natural gas.
Oklahoma pēdējos gados piedzīvojusi tūkstošiem zemestrīču, kas tiek saistīts ar hidraulisko laušanu naftas un gāzes ieguvei no zemes dzīlēm.