Oklahoma experienced a dramatic drop in earthquakes in 2017 — a decline likely due, in part, to regulations limiting activity at oil-field disposal wells, scientists and experts say. New research suggests those regulations might be reducing some quakes more than others.
It’s been two years since state oil and gas regulators adopted a broad regional plan that limits the amount of wastewater pumped into disposal wells in quake-prone areas. The good news: It appears to be working. After peaking in 2015, earthquakes became a lot less frequent.