A powerful magnitude 7.8 earthquake has rocked the island nation of Fiji during the early hours of Friday.

The quake struck at 3.49am about 100km from the capital, Suva.

The quake was at a depth of 608km.

The Pacific Tsunami Warning Centre (PTWC) originally recorded the quake at 8.1 before downgrading it to 7.8.

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PTWC said there was no tsunami threat because the earthquake was located too deep inside the earth.

Civil Defence confirmed there was no tsunami threat to New Zealand.

Twitter user Jimi James said he still felt like he was on a rocking boat, an hour after the quake.