The New York Times reported this week that
“The United States Geological Survey on Thursday released its first comprehensive assessment of the link between thousands of earthquakes and oil and gas operations, identifying and mapping 17 regions where quakes have occurred. […]
“By far the hardest-hit state, the report said, is Oklahoma, where earthquakes are hundreds of times more common than they were until a few years ago because of the disposal of wastewater left over from extracting fuels and from drilling wells by injecting water into the earth. But the report also mapped parts of eight other states, from Lake Erie to the Rocky Mountains, where that practice has caused quakes, and said most of them were at risk for more significant shaking in the future.
“’Oklahoma used to experience one or two earthquakes per year of magnitude 3 or greater, and now they’re experiencing one or two a day,’ Mark Petersen, the chief author of the report, said.”
http://coupland.com/the-age-of-earthquakes/