The study was released by the Journal Geology and says that they believe the injection of wastewater from drilling sites caused the 5.6 magnitude quake.
The quake was centered near Prague, Oklahoma, and was the largest in the central U.S. in many years.
17 states felt the shaking of the earth while 14 houses were damaged in Oklahoma and two people were hurt.
Keep in mind that this report is about injection of wastewater deep into the earth.
It does not say that fracking, another injection method, has caused any problems.
Not everyone agrees with the findings, including the Oklahoma Geological survey who released their own statement saying that they believe that the quake "was the result of natural causes."
The survey does admit that injection can cause quakes, but they maintain that they are much smaller than the November 6th, 2011, incident.