BEIJING, July 22 (Xinhua) -- An earthquake with a magnitude of 5.1 jolted 121 km northwest of Vallenar, Chile, at 0934 GMT on Wednesday, the U.S. Geological Survey (USGS) said.

The epicenter, with a depth of 10 km, was initially determined to be at 27.87 degrees south latitude and 71.7 degrees west longitude. ■