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Pacific Tsunami Warning Center said waves of up to 3 metres (10 feet) were possible for Vanuatu.
A magnitude 7.7 earthquake struck the Pacific Ocean southeast of New Caledonia, triggering a tsunami warning, US monitoring agencies said.
The quake was detected at a depth of 37km (23 miles), the US Geological Service said.
“Based on the preliminary earthquake parameters, hazardous tsunami waves are possible for coasts within 1,000 km (620 miles) of the earthquake epicentre,” the Pacific Tsunami Warning Center said in a bulletin.
It urged people in threatened coastal areas to be alert.
The Pacific Tsunami Warning Center said waves up to 3 metres (10 feet) above tides were possible for Vanuatu.
Smaller waves were possible for Fiji, New Caledonia, Kiribati and New Zealand.