Oklahoma regulators say they will shut down some disposal wells and reduce volume following Sunday's 5.0 earthquake at Cushing.
The Oklahoma Corporation Commission's Oil and Gas Division said Monday that more than 700 square miles are included in the new area, but specific details wouldn't be released until Tuesday.
Wastewater from oil and gas production is injected into the disposal wells. Scientists have linked the practice to the increase in earthquakes in Oklahoma in recent years.
An official said Monday that 40 to 50 buildings sustained "substantial damage" in Sunday's quake.
Normal operations also resumed Monday at the Cushing oil storage terminal, one of the world's key oil hubs.