Northstar Disposal Services LLC in Youngstown, Ohio, has halted operations at its injection well, which disposes of brine used in gas and oil drilling, after a series of small earthquakes in the area, including a magnitude 4.0 on New Year's Eve. (Associated Press)

Northstar Disposal Services LLC in Youngstown, Ohio, has halted operations at its injection well, which disposes of brine used in gas and oil drilling, after a series of small earthquakes in the area, including a magnitude 4.0 on New Year's Eve. (Associated Press)