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THIS IS BEING HIDDEN: Official study confirms link between oil drilling and earthquakes


Oil drilling procedure known as fracking is recognized as a cause of increased seismic activity.

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.

In Oklahoma and some other Midwestern states, the U.S. Geological Survey and others have linked oilfield operations with a dramatic surge in earthquakes. Many of those quakes occur in swarms in places where oil companies pump briny wastewater left over from oil and gas production deep underground.

Researchers are now studying other areas of the state to see if California’s high background level of shakiness is obscuring other seismic activity possibly linked to oilfield activity. California is the country’s No. 3 oil-producing state.

The Center for Biological Diversity environmental group, using state figures, estimates that the amount of oilfield wastewater injected underground in California climbed from 350 million barrels in 1999 to 900 million barrels in 2014.

California on Dec. 10 commissioned Lawrence Berkeley National Laboratory to study the overall potential for oilfield-induced quakes in the state, said Don Drysdale, spokesman for the state Division of Oil, Gas and Geothermal Resources, the main oil regulatory agency. Rules that went into effect last year for some intensive forms of oil production require monitoring for seismic activity.

“In California, of course, we have a lot of natural seismicity here, so it’s much more difficult” to establish that an earthquake was caused by oilfield activity than it is in places like Oklahoma, which used to be quiet, said Art McGarr, a seismologist at the U.S. Geological Survey’s Earthquake Science Center in Menlo Park, California.

“Nonetheless, I think they made at least a fairly convincing case that these earthquakes were related to fluid injection” by oilfield operators, said McGarr. He called the researchers’ analysis “quite careful.”


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