This file is too large for me to embed here, but this graph is one reason why I find the explanation for the surge in Oklahoma earthquakes that "it's near fault lines so of course there will be earthquakes" to be unsatisfying. Why the sudden dramatic increase now? The obvious answer of fracking seems too inconvenient for many to admit.
http://earthquake.usgs.gov/earthquak...QsBarGraph.png
http://earthquake.usgs.gov/earthquak...QsBarGraph.png
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