The area felt a 4.0 magnitude quake Tuesday morning and a 4.3 one Monday afternoon.
One tremblor hit Grant County, with an epicenter about three miles northeast of Medford at a depth of about 4.7 miles, according to the United States Geological Survey (USGS).
The other was felt in Noble County, which is southeast of Medford.
Angela Wilson, a dispatcher in the Grant County Sheriff's office, told USA Today that she felt shaking in the Medford office but that no calls related to the quake had come in from first responders or residents.
The USGS says the quake was felt in the Oklahoma City area and in southern Kansas.
Oklahoma, Texas and Kansas have been feeling a series of small quakes, which scientists link to fracking and its wastewater wells in the area.
Fracking, or hydraulic fracturing, is the process of blasting pressurized sand and liquid (water and other chemicals) deep into the earth to extract gas and oil, a controversial process a growing number of states are using.
