These rumblings are warnings. Things in the middle of the country are heating up from Louisiana northward.
Dutchsinse has a super graphic for this earthquake pinpointing its location:
(http://sincedutch.files.wordpress.com/2013/03/oklahoma-3-4m-earthquake-fracking-mar-5-final.jpg)
These earthquakes have been ongoing since the fracking operations began. Earthquakes are not the average for Oklahoma so I have read. They are very rare but now are increasing.
http://www.texassharon.com/2011/11/05/six-fracking-earthquake-notices-from-oklahoma-last-night/
Again, it is past time for people to put aside political agenda and the lust for money and think seriously about what is being done to the land itself.