An earthquake measuring 6.7 on the open Richter scale struck 75 kilometres from the largest island of Vanuatu this morning.
The depth of the quake was nearly 150 kilometres.
There are no reports of damage.
William Worwor at Vanuatu's met service says there would have been very little time to warn of a possible tsunami.
"If a tsunami was generated - some of the islands that were very close to the epicentre would have already been struck by a tsunami."