Oklahoma looks at fracking link to quakes

The US state of Oklahoma is investigating whether a more than 20-fold jump in the number of earthquakes in the past two years is connected to a surge in fracking, the controversial drilling method used to extract shale gas, The Independent has learnt.

The number of earthquakes recorded in the state soared from its historical average of about 50 a year to 1,047 last year and is likely to match or break that this year, said Austin Holland, a seismologist at the Oklahoma Geological Survey.   Read Here