LUTHER, Okla. (AP) — Central Oklahoma was rattled Wednesday morning by an earthquake, but there are no immediate reports of damage or injuries.

The U.S. Geological Survey says the earthquake had a preliminary magnitude of 4.0. It struck shortly after 6 a.m. and had in epicenter in Luther, or about 23 miles northeast of Oklahoma City.

The USGS says the earthquake was widely felt in central Oklahoma and as far north as Wichita, Kansas.

A magnitude 2.7 magnitude quake also shook northeast of Rose Hill Kansas on Wednesday, according to the USGS.

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.