Even when earthquakes appeared strongly correlated to wastewater injection, OGS has been reluctant to discuss a connection. In September 2013 a new disposal well was turned on in Love County in southern Oklahoma. Soon, quakes began to jolt the area, sometimes several a day.
The well reached its peak daily injection of more than 9,000 barrels of wastewater on Sept. 20, 2013. Three days later the area experienced a magnitude 3.4 quake, moving furniture inside homes and knocking down a chimney. Injection at the well was curtailed, then stopped altogether. The seismic activity dipped almost immediately.
Still, the OGS hesitated to link the two. “We cannot rule out that this observation could be simply a coincidence,” Holland wrote in a report a week later. In early October, Holland spoke at a town hall meeting in Love County, where he again said no conclusions could be drawn about the cause of the quakes.
All of this said, Holland "recently told Bloomberg that the vast majority of the increase in earthquakes is due to the injection of oil and gas wastewater" and "bristles at any suggestion that industry pressure slowed him from reaching that conclusion."