A recent study of seismic activity has shown that Oklahoma is now as much of an earthquake risk as California. The real difference is between natural occurring quakes and man-made quakes. Last year Oklahoma received 900 3+ magnitude earthquakes. These are relatively felt but cause minor damage at best but these could increase with time. This “is due to the injection of billions of barrels of salty waste-water that have come to the surface during oil and natural gas exploration. The water’s injection back into the earth has put pressure on the state’s fault lines, leading to quakes that have damaged homes, schools and other structures” (Sanburn). They have begun to set rules to limit the waste-water by oil and gas companies. This is is relatively recent so more things are to come to keep this from occurring. Hopefully other states will take notice and double check to keep people safe.