A spike in earthquakes across Oklahoma is forcing the state’s energy regulator to urgently consider tougher restrictions on drilling activity, a spokesman said on Wednesday, calling it a “game changer.” From June 17 to 24, there have been 35 earthquakes of magnitude 3.0 or greater in the state, according to the Oklahoma Geological Survey. Particularly worrying for regulators, some of the recent quakes occurred in the Oklahoma City metropolitan area, where there are no high-volume wastewater injection wells. The spike in quakes comes roughly two months after new rules governing the disposal of briny wastewater from drilling took full effect. Drillers were directed by the Oklahoma Corporation Commission (OCC), which regulates the oil and gas industry, to stop disposing wastewater below the state’s deepest rock formation, believed to be one of the main causes of the quakes, and to reduce the depth of wells that already go that deep. […]