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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.
For the too lazy to click the link/TLDR crowd it sums up as thus: The United States Army and The US Geological Survey determined back in 1966 that deep injection wells, exactly like what is used in fracking, were causing significant seismic events aka earthquakes.