There were no immediate reports of casualties or damage due to the earthquake that struck at 19:03 local time, Xinhua news agency reported.

According to the USGS, the epicenter of the earthquake was determined at 14.609 degrees south latitude and 167.249 degrees east longitude, at a depth of 156.7 km.

The Pacific Tsunami Warning Center did not immediately issue a tsunami warning based on the earthquake.

Pacific island countries such as Fiji, Tonga and Vanuatu lie on the so-called Pacific 'Ring of Fire', an arc of earthquake and volcanic zones where continental plates collide, often causing seismic activity.