Pair of magnitude-3.9 quakes rumble central Ark.

GREENBRIER, Ark. – A pair of magnitude-3.9 earthquakes has rumbled through central Arkansas this week, about a month after two companies halted operations at nearby injection wells over concerns they may be linked to seismic activity plaguing the region.

The U.S. Geological Survey says the latest big quake struck near Greenbrier on Friday, less than 24 hours after an equally strong quake hit nearby. Officials said no one was hurt and damage was minimal.

The quakes are the largest in the area since the companies temporarily ceased the operations March 4 at the behest of the Arkansas Gas and Oil Commission. The wells' owners, Chesapeake Energy and Clarita Operating, say they don't think the wells are tied to the earthquakes.

The Arkansas Geological Survey says it's premature to rule out a possible link.