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The study, published Tuesday in Seismological Research Letters, reports that fracking waste injection wells are now the leading cause of earthquakes in Texas. Hydraulic fracturing, or fracking, involves thrusting chemicals and water against shale rock to break it up and release oil or gas. The process produces large amounts of waste fluid, or brine, that is either recycled or disposed of in injection wells.
Fracking likely causes earthquakes, but only low magnitude ones that humans don't notice. There is no evidence that it causes high magnitude earthquakes. They've been fracking heavily in Nebraska and there hasn't been an earthquake in decades (an earthquake noticeable by humans that is).