A temblor measuring 3.0 on the Richter scale occurred at 5:42 p.m. Monday, said Kenneth Luza, geologist with the Oklahoma Geological Survey in Norman.
Its epicenter was located in Grady County, about 4.4 miles northwest of Lindsay, Luza said. There were no reports of property damage or injuries, he said.
''The quake happened in an area that's part of a fault system that extends from Norman down through Grady and Garvin counties,'' Luza said.
Monday's quake was the largest so far in 2004. One of 2.6 magnitude that was recorded near Minco in September was part of a series of earthquakes in the Norman area.
A swarm of earthquakes was recorded near the McClain County-Cleveland County line in 2003, Luza