“At the time of the quakes, Hilcorp was conducting a “zipper” fracture, a technique where two parallel, horizontal wells are fracked in tandem. Pelepko says this technique enlarges the pressure zone near the wells during hydraulic fracturing, stimulating the release of oil and gas by injecting millions of gallons of water, sand and chemicals into rock formations. Pelepko says pressure can also be a factor in inducing earthquakes.”

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