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According to the study’s authors, the culprit isn't the actual drilling itself but the injection of wastewater back into the ground afterward. Even though wastewater had been injected into old wells around Prague since the early 1990s, the authors argue that as crevices previously containing oil filled with water, from 2001 to 2006, the amount of pressure needed to keep pushing water underground rose tenfold, or 1,000 percent. The resulting pressure change triggered a “jump” in a nearby fault line known as the Wilzetta fault, and then—boom, earthquake. The well the study examined was not drilled using the controversial hydraulic fracturing techniques, commonly known as fracking.