| Updated at: 0017 PST, Sunday, February 13, 2011|
WELLINGTON: A strong 6.1-magnitude earthquake struck under the sea some 55 kilometres (34 miles) from the capital of Tonga Sunday, the US Geological Survey (USGS) said, but no tsunami warning was issued.
The quake hit northwest of the South Pacific archipelago's capital Nuku'Alofa at a depth of 81 kilometres (50 miles), some 290 kilometres (180 miles) from its second largest town of Neiafu.
There were no immediate reports of damage or casualties from the quake at 06.57am local time on Sunday (1757 GMT Saturday).
Tonga, almost 2,000 kilometres (1,200 miles) northeast of New Zealand, lies on the so-called Pacific "Ring of Fire", where continental plates collide causing frequent volcanic and seismic activity.
Nine people died in Tonga in an earthquake-triggered tsunami in October 2009 that also killed 143 people in Samoa. (AFP)