OKLAHOMA CITY (AP) — A series of earthquakes has rattled parts of northern Oklahoma, including a 4.1 magnitude temblor near Medford.
The U.S. Geological Survey says the earthquake was recorded at 4:40 p.m. Friday about nine miles north-northwest of Medford in Grant County. The quake occurred at a depth of less than two miles.
Geologists say that earthquake was followed by two others in the same area. The first, a 3.1 magnitude quake, occurred at 4.53 p.m. eight miles north-northwest of Medford. The second, a magnitude 3.9 temblor, occurred two minutes later eight miles northwest of Medford.
Smaller quakes were recorded in the Cherokee, Helena and Fairview areas. There were no immediate reports of damage.
Geologists have said some earthquakes are likely triggered by the injection of wastewater from oil and natural gas operations.