A 7.3 magnitude earthquake struck Tonga just before midnight local time, 211km from the capital Nuku'alofa.
People in Tonga were initially evacuated to higher ground but so far there have been no reports of damages.
The Tongan government said the marine tsunami warning issued earlier for the entire kingdom has now been cancelled.
However, there are concerns for four fishermen who were at sea at the time the tsunami warning was issued.
The US Geological Survey said the quake was 24.8km deep, 211km from the capital Nuku'alofa and east of south-east of Neiafu.
An RNZ Pacific correspondent in Nuku'alofa said the quake lasted about two minutes.
Read more via the link HERE