One possibility is geological.
'We have a lot of pre-existing faults in Oklahoma,' seismologist Austin Holland told KOCO.
However, with little history of seismic activity in the area, it's unclear why the quakes would become so
Another potential cause is the change in water levels at nearby LIberty Lake, where a swarm of the earthquakes were centered Saturday.
The controversial hydraulic fracturing or 'fracking' method pumping millions of gallons of water, sand and chemicals into fractures in the Earth.
Odd you don't hear much about earthquakes in the middle of the US.
Edited by Socio, 18 February 2014 - 01:10 PM.