LUTHER, Okla. (AP) — The U.S. Geological Survey has recorded several small to moderate earthquakes in Oklahoma, including a magnitude 4.0 quake.
The temblor was recorded at 5:27 p.m. Thursday, 1 mile north of Luther — or 25 miles northeast of Oklahoma City.
The Logan County Sheriff's Office says no injuries or damage are reported.
The quake is one of seven recorded since shortly after midnight. The others range in magnitude from 2.7 to 3.6.
The number of magnitude 3.0 or greater earthquakes has skyrocketed in Oklahoma, from a few dozen in 2012 to more than 900 last year and scientists have linked the increase to the underground disposal of wastewater from oil-and-gas production. State regulators are asking oil and gas companies to reduce their wastewater disposal operations.