A magnitude 3.8 earthquake struck central Arkansas on Thursday morning, the U.S. Geological Survey reports.
The agency put the quake's depth at four miles and said it was centered about four miles from the town of Greenbrier.
It was the third quake above magnitude 3.2 in the area in the past 24 hours.
Last October, a 4.0 quake stuck the same area as Thursday's temblor.
At that time, officials said they were investigating what could be behind a series of 500 quakes in under a month.