Article Background: Human-induced earthquakes have become an important topic of political and scientific discussion, owing to the concern that these events may be responsible for widespread damage and an overall increase in seismicity.
Fracking, a process that intentionally causes thousands of “microearthquakes” when the rock containing oil or gas is fractured apart is shaking things up — literally. Fracking, along with the disposal of toxic fracking waste through underground injection control wells has been linked to induced seismicity — in other words, to human-caused earthquake activity.
In November 2013, a series of earthquakes began along a mapped ancient fault system near Azle, Texas. Here we assess whether it is plausible that human activity caused these earthquakes.