Oklahoma Earthquakes Are a National Security Threat - Bloomberg Business
"Now the massive oil stockpile faces an emerging threat: earthquakes.
In the past month, a flurry of quakes have hit within a few miles of
Cushing, rattling the town and its massive tanks. According to the
Oklahoma Geological Survey, more than a dozen quakes have registered
3.0 or higher on the Richter scale within a few miles of Cushing since
mid-September. The biggest, registering at 4.5, hit about three miles
away on Oct. 10."
http://www.bloomberg.com/news/articles/2015-10-23/oklahoma-earthquakes-are-a-national-security-threat