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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 (hydraulic fracturing) is a term used to describe a natural gas drilling technique in which thousands of gallons of water, chemicals and sand are pumped into a shale formation to break apart rock and release the natural gas that is trapped below.he fluid is injected further into the formation as the rock fractures. The sand settles in the fractures, keeping them open. These new and open pathways allow the gas to flow freely into the well. Hydraulic fracturing is used mainly to stimulate production from oil and natural gas wells.