A new study has revealed possible and previously unknown sources of earthquakes in Oklahoma, the U.S. Geological Survey and Oklahoma Geological Survey reported Friday. 

The deposition of Oklahoma's former state seismologist last month continues to shed light on politics that may have impeded the state scientific community's response to an unprecedented increase in earthquakes. 

More evidence is coming to light showing that scientists at the Oklahoma Geological Survey were pressured not to publicly connect the state's dramatic increase in earthquakes with oil and gas activity. 

Oklahoma's former chief earthquake researcher comes clean on why he quit his job and left the state. 

Recent rumblings in two cities likely are aftershocks, not signals of stronger earthquakes to come, said state and federal scientists. 

The Oklahoma Geological Survey has proposed to install more than 70 permanent seismic stations across the state that would allow scientists to better study earthquakes. The $3.5 million proposal would be placed in a grid pattern and phased in for three years, The Tulsa World reported. 

Oklahoma could see another big earthquake by the end of the year. In a recent publication, some seismologists, say they believe there's as much as an 80 percent chance there will be a 5.0-magnitude earthquake still to come in 2017.

The Induced Seismicity Department at the Oklahoma Corporation Commission (OCC) and the Oklahoma Geological Survey (OGS) announced an investigation into the latest earthquake activity in the Edmond area.

Scientists are working to determine what caused six earthquakes near Stroud Friday morning. 

An earthquake centered in Lincoln County jolted residents across Oklahoma, Friday morning.

The U.S. Geological Survey says the quake measured 4.2 was centered near Stroud.

Edmond residents want to know what is causing their homes to shake for hours at a time. Dana Hertneky investigates.