Oil-rich Oklahoma hit by 3.7 tremor
Monday, June 20, 2016 - 06:01
in Earth & Climate
Daniel J. GraeberOKLAHOMA CITY, June 20 (UPI) -- A magnitude-3.7 hit central Oklahoma early Monday, the U.S. Geological Survey reported after several similar small tremors rocked the oil-rich state last week.