As reported in the Wall Street Journal, it may have been a Chesapeake Energy disposal that caused the earthquakes.
Chesapeake said it had shut down two disposal wells “as a precautionary measure.”
The Dallas-Fort Worth area has experienced more than a dozen small quakes since last October, though there have been no reports of significant damage or injury. The area lies at the heart of the Barnett Shale, a huge natural-gas field where thousands of wells have been drilled in recent years. Many locals suspect a connection, especially because gas production in the area involves injecting water into the ground at high pressure to crack open the gas-bearing rock, a process known as “hydraulic fracturing.”
SMU researchers found a “possible correlation” between the quakes and a salt water disposal well operated by Chesapeake on the southern end of Dallas-Fort Worth International Airport. The airport sits atop a fault line.