U.S. government geologists now recognize much of Oklahoma as earthquake country, accounting for the bulk of 17 regions newly designated for seismic hazards attributed to underground disposal of wastewater from fossil fuel production.
The 17 regions are delineated in the first official map by the U.S. Geological Survey documenting areas of elevated and increasing earthquake frequency found to be induced by human activity, namely deep-well injection of oil and gas wastewater.
The areas are spread across the Central and Eastern United States, from Colorado to Ohio.