A massive quake of magnitude 8.2 struck in the Pacific Ocean close to Fiji and Tonga on Sunday but it was so deep that it did not cause any damage, authorities in Fiji said.

The U.S. Tsunami Warning Center also said the quake was too deep to cause a tsunami.

The quake's depth at 347.7 miles (560 km) would have dampened the shaking at the surface.

The director of Fiji's Mineral Resources Department, which runs the country's seismology unit, told Reuters on Sunday the earthquake was widely felt, but there were no reports of damage.

"We are monitoring the situation and some places felt it, but it was a very deep earthquake," Director Apete Soro said by telephone.