An earthquake of magnitude 6.7 has struck in the sea about 110 kilometres south-west of Hihifo, Tonga, the United States Geological Survey says.

A tsunami advisory was issued for American Samoa and the earthquake could soon also affect nearby coasts, Pacific Tsunami Warning Centre said on Monday morning.

The quake was at a depth of 36 kilometres, the USGS said.

Monday’s quake came nearly a year after a massive undersea volcanic eruption triggered waves up to 15 metres high and inflicted enormous damage on Tonga.

Several people were killed by the impact of the eruption and subsequent tremors.

-more to come

-with AAP

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