Deckhands on a Sandridge Energy oil rig change out a drill pipe in a fracking operation on the Oklahoma border in Harper County, Kan., in February 2012. A 3.8-magnitude quake in the area on December 16, 2013, rattled windows, cracked walls and shook furniture.
Deckhands on a Sandridge Energy oil rig change out a drill pipe in a fracking operation on the Oklahoma border in Harper County, Kan., in February 2012. A 3.8-magnitude quake in the area on December 16, 2013, rattled windows, cracked walls and shook furniture. MCT
Deckhands on a Sandridge Energy oil rig change out a drill pipe in a fracking operation on the Oklahoma border in Harper County, Kan., in February 2012. A 3.8-magnitude quake in the area on December 16, 2013, rattled windows, cracked walls and shook furniture. MCT

Researchers warn Oklahoma quakes linked to fracking boom could get stronger

May 06, 2014 09:35 AM

UPDATED June 04, 2014 09:59 AM

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