An earthquake measuring 4.7 on the Richter scale jolted northwest China's Xinjiang Uygur Autonomous Region at 11:21 a.m. Friday (Beijing Time), according to the China Earthquake Networks Center. The epicenter, with a depth of 6 km, was monitored at about 43.6 degrees north latitude and 82.3 degrees east longitude, Xinhua quoted the center as saying in a statement.