The epicentre of the strong quake was 219 kilometres (136 miles) northwest of Pangai, a town on the remote island of Lifuka, at a depth of 14.5 kilometres.
There were no immediate reports of the quake being felt in Tonga or neighbouring Fiji.
The area has seen daily earthquake activity since Tonga's Hunga Tonga-Hunga Ha'apai erupted earlier this month.
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