The research links a local surge in injection by oil companies of wastewater underground with an unusual jump in seismic activity in and around the Tejon Oilfield in southern Kern County. The shaking topped out in 2005 with three quakes, the biggest magnitude 4.6.. Researchers calculated the odds of that happening naturally, independent of the oilfield operations, at just 3%. In Oklahoma and other states, the U.S. Geological Survey linked oilfield operations with a dramatic surge in earthquakes.
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