Fracking earthquakes
Extracts from a BBC News article by Matt McGrath published 3 July 2014 under the headline: Wastewater from energy extraction ‘trigger US quake surge’
Massive injections of wastewater from the oil and gas industry are likely to have triggered a sharp rise in earthquakes in the state of Oklahoma.
Researchers say there has been a forty-fold increase in the rate of quakes in the US state between 2008-13.
The scientists found that the disposal of water in four high-volume wells could be responsible for a swarm of tremors up to 35km away.
Their research has been published in the journal, Science.
There has been increasing evidence of links between the process of oil and gas extraction and earthquakes in states like Arkansas, Texas, Ohio and Oklahoma in recent years.
In 2011, a small number of people were injured and 14 houses were destroyed in the town of Prague, Oklahoma by a 5.7 tremor.Investigators linked it to the injection of wastewater from the oil industry.
More than 2,500 earthquakes greater than magnitude 3.0 have occurred around the small town of Jones since 2008.
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