Responding to geologists who claim they have made direct links between fracking operations and seismic activity in the state, Ohio regulators on Friday pulled permits for at least one drilling operation.

According to the Associated Press:

State Oil & Gas Chief Rick Simmers told The Associated Press on Friday that 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.

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.

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