An earthquake measuring 6.9 on the Richter scale jolted Southwest of Africa at 2014-04-15 03:57:00 GMT on Tue (2014-04-15 11:57:00 Beijing Time), the U.S. Geological Survey said. The epicenter, with a depth of 10.0 km, was initially determined to be at 53.493 degrees south latitude and 9.152 degrees east longitude.