A small tremor was recorded early Friday in the shale heartland of Oklahoma, one day after state regulators limited work because of seismic activity. The U.S. Geological Survey recorded a magnitude-2.8 tremor at 2:32 a.m. EDT near the town of Hennessey, Okla. That followed a magnitude-3.2 tremor in the same area Thursday morning and is part of a large cluster of seismic activity in the region over the last 30 days. The state Oil and Gas Conservation Division on Thursday ordered Choate Disposal Services LLC to stop operations at one of its wells near the Arbuckle formation. One of the U.S. states with a significant amount […]