35 Injection Wells Shut Down After Strong Oklahoma Quake

One of the strongest earthquakes ever recorded in Oklahoma rattled the area northwest of Pawnee on Saturday, fuelling growing concern about seismic activity linked to energy production, a federal agency said. The magnitude 5.6 quake, which was felt from South Dakota to Texas, prompted the closure of some 35 wastewater disposal wells in the area, officials said.
The shallow quake struck 9 miles (14 km) northwest of Pawnee in north-central Oklahoma at 7:02 a.m. CDT (1302 GMT). Its 5.6 magnitude matched a 2011 earthquake for the biggest on record in the state, the U.S. Geological Survey said.