The European-Mediterranean Seismological Centre (EMSC) reported a magnitude 5.4 quake in Vanuatu near Isangel, Tafea Province, Volcano Discovery reported.
The earthquake hit on Saturday at 6:32am local time at an intermediate depth of 125 km.
A second report was later issued by France's Reseau National de Surveillance Sismique (ReNaSS), which listed it as a magnitude 5.3 earthquake.
A third agency, the German Research Centre for Geosciences (GFZ), reported the same quake at magnitude 5.2.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.