A strong 6.7-magnitude earthquake struck off the South Pacific islands of Wallis and Futuna in the early hours of Monday, following another powerful earthquake off Tonga.
The United States Geological Survey says the latest quake hit at 5:15 am local time and occurred 205 kilometres southeast of the Wallis and Futuna capital of Mata-Utu, at a depth of 10 kilometres.
It came less than two hours after a 6.4-magnitude quake struck off Tonga.
Neither generated tsunami alerts and there were no immediate reports of damage.
The undersea quake off Tonga hit at 3:52 am on Sunday and was 197 kilometres northwest of the town of Hihifo.
The epicentre was also at a depth of 10 kilometres.