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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.
- the process explained in 15 seconds. 13 December 2012 Last updated at 10:06 GMT. The government has given the go-ahead for a firm to resume the controversial technique known as fracking to exploit gas in Lancashire. The firm, Cuadrilla, was stopped from fracking after two small earthquakes. The process involves drilling down and creating tiny explosions to shatter and crack hard shale rocks to release the gas inside. Judith Moritz explains.