STAPLETON, Neb. (AP) — Federal authorities say the sixth mild earthquake in a week has occurred under central Nebraska.

The U.S. Geological Survey says the latest occurred was recorded around 4:50 p.m. Monday, 22 miles (35 kilometers) east-southeast of Stapleton in Custer County, near Arnold. It occurred 3 miles (5 kilometers) under the surface and was rated a 3.1 magnitude temblor.

No damage or injuries have been reported.