5.1-magnitude quake hits 120 km NNE of Hihifo, Tonga -- USGS

HONG KONG, Aug. 21 (Xinhua) -- An earthquake of 5.1 magnitude jolted 120 km NNE of Hihifo, Tonga on Tuesday, the U.S. Geological Survey (USGS) said.

The epicenter, with a depth of 20.18 km, was initially determined to be at 14.9376 degrees south latitude and 173.3342 degrees west longitude.