Fracking shakes the American west: ‘a millennium’s worth of earthquakes’

Seismologists' warnings about hydraulic fracturing and wastewater disposal divide residents, politicians and companies in Colorado and Oklahoma, while temblors increase around the region

Oklahomans don't blink when they hear warnings about tornadoes, drought or ice-storms. Earthquakes, however, catch their attention.

Related: Series of small earthquakes hit near Oklahoma crude oil storage hub