Reuters: Oklahoma regulators are cracking down harder on saltwater disposal wells near the vitally important Cushing crude storage hub, where a rash of quakes have stoked concerns its tanks and pipelines may not be designed to handle a major seismic event. The state's oil and gas regulator late on Monday said all saltwater disposal wells within a 10-mile radius of Cushing could face new limits. It has also basically halted approvals for new disposal wells for the time being and ordered 13 wells to shut in...