A number of seismologists have concluded that the 5.7-magnitude earthquake that hit near Prague a year and a half ago was caused by injecting wastewater from oil and gas production deep underground.
Earthquakes in other states have been linked to disposal wells, but Oklahoma’s is the largest. Yet Oklahoma’s regulatory response has been one of the smallest.
Seismologists have linked wastewater disposal wells to earthquakes in at least a half-dozen states. On a geologic scale, the tremors are small. And the quakes — in states like Arkansas, Colorado, Illinois, and Ohio — have all been smaller than the November 2011 quake that shook Oklahoma near Prague.