- The U.S. Geological Survey releases maps that for the first time show potential seismic dangers from man-made as well as naturally-occurring earthquakes.
- The states most as risk of earthquakes from oil and gas activity - Oklahoma, Kansas, Texas, Colorado, New Mexico and Arkansas, in order - are largely concentrated in regions where the energy industry disposes of millions of gallons of wastewater that is produced during the drilling and pumping process.
- In 2015, the USGS recorded 2,500 quakes with a magnitude of 2.5 or higher in Oklahoma, up from just three in 2005; the state's leading oil and gas producers include CLR, CHK, DVN, SD and MRO.