ODNR acted with similar speed and alacrity in the spring of 2014 when a magnitude-3.0 quake linked to fracking shook Poland Township. That and subsequent aftershocks were associated with deep drilling by Hilcorp. Energy Co. at the Carbon Limestone landfill. ODNR said that spring that fracking likely aggravated a small, previously undetected fault. The agency then used its authority to immediately suspend operations there.