DEP spokeswoman Melanie Williams says Hilcorp Energy Co. stopped fracking at the Mahoning Township site at about noon Monday. That was about 12 hours after the U.S. Geological Survey recorded a magnitude-1.9 earthquake and about 10 hours before another quake of the same size was recorded.
A woman who answered the company's phone in New Castle on Thursday referred The Associated Press to a spokesman at the company's Houston headquarters who wasn't immediately available.
Williams says Hilcorp was fracking two wells on a four-well pad about 45 miles northwest of Pittsburgh when the first quake occurred.
There were no reports of property damage.