The Texas Railroad Commission said Friday it was considering shutting down two wastewater disposal wells in North Texas’ Barnett Shale after they were linked to seismic activity in the area.

A study released by scientists at SMU earlier this week presented evidence a series of earthquakes around the rural town of Azle in late 2013 were caused by two disposal wells operated by XTO Energy, the Forth Worth subsidiary of Exxon Mobil, and Houston-based EnerVest.

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