The U.S. Geological Survey says a 3.2 magnitude earthquake has rattled the central Oklahoma town of Harrah.
The temblor was recored Saturday at around 4:30 p.m. Hours before that, the USGS recorded a 2.8 magnitude quake near the north central town of Langston.
There were no immediate reports of injuries or damage to property.
Scientists say damage is not likely in earthquakes below magnitude 4.0.
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.
Scientists have linked the increase to the underground disposal of wastewater from oil and gas production and state regulators have asked producers to reduce wastewater disposal volumes.