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BEIJING, June 28 (Xinhua) -- An earthquake with a magnitude of 5.3 jolted 5 km southwest of Guanica, Puerto Rico at 06:42:42 GMT on Sunday, the U.S. Geological Survey said.The epicenter, with a depth of 6.5 km, was initially determined to be at 17.929 degrees north latitude and 66.925 degrees west longitude.