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California earthquake series in 2005 linked to oilfield wastewater injections, study finds

California earthquake series in 2005 linked to oilfield wastewater injections, study finds

 A 2005 spate of quakes in California's Central Valley almost certainly was triggered by oilfield injection underground, a study published Thursday said, in the first such link in California between oil and gas operations and earthquakes.

Researchers at the University of California at Santa Cruz, the University of Southern California and two French universities published their findings Thursday in a publication of the American Geophysical Union.

The research links a local surge in oil company injection of wastewater underground, peaking in 2005, with an unusual jump in seismic activity in and around the Tejon Oilfield in southern Kern County.

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