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Ohio earthquakes linked to fracking

State regulators have for the first time have linked earthquake activity in eastern Ohio to hydraulic fracturing, confirming the suspicions of activists pushing unsuccessfully for a drilling ban.

State Oil & Gas chief Rick Simmers said the state has halted drilling indefinitely at the site near Youngstown where five minor tremors occurred in March following investigative findings of a probable link to fracking.

A deep-injection well for fracking wastewater was tied to earthquakes in the region in 2012.

Mr Simmers says Ohio will require sensitive seismic monitoring as a condition of all new drilling permits within three miles of a known fault or existing seismic activity of 2.0 or greater.

Drilling will pause for evaluation with any tremor of 1.0 magnitude and will be halted if a link is found.

A seismologist with the US Department of Interior said it is the first time seismic activity has been linked to Marcellus shale exploration which has swept the north-eastern United States over the past few years.

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