HONG KONG, Oct. 28  -- A magnitude 6.1 earthquake jolted 129 km northwest of Hihifo, Tonga at 0315 GMT on Tuesday ( 11:15 Beijing time), the U.S. Geological Survey (USGS) said.

The epicenter, with a depth of 35.0 km, was initially determined to be at 15.1926 degrees south latitude and 174.6655 degrees west longitude.