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April 24, 2015

No Shit, Sherlock

The Oklahoma Geological Survey, a government agency, has announced that it "considers it very likely that the majority of recent earthquakes, particularly those in central and north-central Oklahoma, are triggered by the injection of produced water in disposal wells." IOW, fracking. But it's not fracking alone that does it, or North Dakota would be experiencing the same huge leap in earthquake activity.

"These earthquakes swarms are occurring over a large area, about 15% of the area of Oklahoma, that has experienced significant increase in wastewater disposal volumes over the last several years."

"Most of the earthquakes in Oklahoma are occurring within crystalline basement, deeper than most oil and gas operations. However, reactivation of deeper basement faults from water injection/disposal at shallower depths is often observed in cases of triggered seismicity."

"The majority of wastewater disposal is targeted for injection in the Arbuckle formations, which closely overlie the crystalline basement."

Compare this map of earthquakes greater than 2.5 over the last 30 days in Oklahoma with this map of known faults in Oklahoma. It looks to my layman's eyes that the quakes are occurring in an area well away from the major faulted areas.

Filed under Science | permalink | April 24, 2015 at 10:21 AM

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