A magnitude-5.8 earthquake and a series of smaller aftershocks in Oklahoma has led to the discovery of a new fault line. The discovery stoked fears among some scientists about other unknown faults that could be triggered by oil and gas wastewater that’s being injected deep underground.

State and federal regulators this week said 32 disposal wells in northeastern Oklahoma must shut down because they are too near the newly discovered fault line that produced the state’s strongest earthquake on record on Sept. 3. The quake shook Wichita and many other parts of Kansas. It caused minor damage to some city and county buildings. READ MORE