AlQa'dah 10, 1432, Oct 8, 2011, SPA - A magnitude 6.0 earthquake struck northeast of the capital of the Pacific island nation of Tonga on Saturday, the U.S. Geological Survey said. The quake was located 137 miles east-northeast of Nuku'Alofa at a depth of 12.2 miles, the survey was quoted as disclosing by Reuters.