HONG KONG, June 6 (Xinhua) -- An earthquake measuring 5.4 on the Richter scale jolted 202 km NE of Neiafu, Tonga at 22:33:52 GMT on Sunday, the U.S. Geological Survey said. The epicenter, with a depth of 45.04 km, was initially determined to be at 17.5855 degrees south latitude and 172.4223 degrees west longitude.