I really, really doubt this is true. The USGS and Texas Geological Survey should bear out the truth. WE have earthquakes in OK all the time, they are too small to detect without geophysical data. I want to see one peer reviewed paper from University of Texas, or Oklahoma, or CO School of Mines, or Texas A&M, or Stanford, or Tulsa University, that supports the notion that fracking can cause or initiate an earthquake.
There was one in Wash DC several months ago. It shook things at least as far as NYC.
Well, the oil industry has been fracking in Texas and Oklahoma for about sixty years now.
You'd think that would be enough time to establish a correlation. So, there probably isn't one...