Fracking can cause earthquakes that last for months, study finds

‘Fracking can cause earthquakes that rumble on for months after the controversial gas extraction process ends, a new study has found.
Researchers recorded more than 900 individual tremors linked to hydraulic fracturing, as it is properly known, between December 2014 and March 2015 in an area around Fox Creek in Alberta, Canada, according to a paper in the journal Science.
Most were too small for anyone to notice, but the largest registered a magnitude of 3.9 and took place in January two weeks after fracking had stopped. Such a quake would usually be felt but is only likely to cause minor damage.’
Read more: Fracking can cause earthquakes that last for months, study finds