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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.
College of Charleston | Dept. of Geology and Environmental Science | http://cofc.edu/~scearthquakes/. WHAT HAPPENS DURING AN EARTHQUAKE? Earthquakes occur because friction holds the rock masses on either side of the fault together, while plate motion slowly bends and stretches the rock, storing energy much like the energy. stored in a stretched. rubber band.