“Seismologists say that one of the state’s biggest industries is upsetting a delicate balance deep underground. They blame the oil and gas business — and particularly a technique called wastewater injection — for waking up ancient fault lines, turning a historically stable region into a shaky one, and opening the door to larger earthquakes that Texas might not be ready for.
The state is finally trying to change that. In December, the Texas Railroad Commission — the state agency that regulates oil and gas operations and no longer has anything to do with railroads — suspended wastewater injection at 33 sites across a region where more than half a million people live. This is a notable turnaround for the Railroad Commission, which until recently did not acknowledge a link between oil and gas operations and earthquakes, and might be a sign of just how serious the earthquakes have gotten.”
https://www.vox.com/22891806/texas-earthquakes-oil-gas-drilling-wastewater-reinjection