OKLAHOMA CITY (AP) _ The Oklahoma Corporation Commission is adding new oil and natural gas wastewater disposal wells to the list of wells that can potentially trigger earthquakes.
The agency issued a directive in March involving more than 300 disposal wells that inject into an Oklahoma geologic formation. The region includes 21 counties that have experienced high earthquake activity. The latest directive expands the areas covered and applies to 211 more disposal wells.
Operators have until August 14th to prove they are not injecting below the formation. Seismologists believe disposal below the formation poses a potential risk of causing earthquakes, as it puts the well in communication with the ``basement'' rock.
The Oklahoma Geological Survey says it's likely some earthquakes in the state are being triggered by the injection of wastewater into the wells.