Earthquakes are rippling through Oklahoma with an intensity so persistent they are almost considered normal.
http://www.nbcnews.com/news/us-news/oil-gas-industry-ensnarled-spate-oklahoma-earthquakes-n682511
Earthquakes are rippling through Oklahoma with an intensity so persistent they are almost considered normal.
http://www.nbcnews.com/news/us-news/oil-gas-industry-ensnarled-spate-oklahoma-earthquakes-n682511