The state geological agency for Oklahoma, which is in the midst of man-made earthquake swarms linked to oil production, is facing the prospect of having no seismologists on staff.
Oklahoma oil and gas companies are pushing back on claims that they are responsible for earthquakes that rattled the state's central region nearly four years ago.
The earthquakes displayed were located in Oklahoma and occurred from Jan. 2, 2008, until Jan. 15, 2015, based on Oklahoma Geological Survey information. The earthquakes are a minimum 2.0 magnitude. Click map to link to animation. Map courtesy of USGS.
A surge in seismic activity is occurring around the U.S., and many top scientists are pointing at injection of waste from drilling and hydraulic fracturing as a possible culprit.