A strong earthquake with a magnitude of 6.2 struck near Vanuatu early Wednesday but there were no reports of casualties or damage, officials said.
The epicentre was 165 kilometres under the seabed, 70 kilometres north-west of the island of Tanna and 150 kilometres south-east of the capital Port Vila, the US Geological Survey said.
An official at the Vanuatu National Disaster Management Office said no injuries or damage had been reported after the earthquake, which hit at 5.03 am local time (11.33 pm IST). No tsunami warning was issued.
The earthquake occurred close to the fault line separating the Australian and Pacific plates of the earth's crust, where quakes and volcanic activity are common.
The reading was based on the open-ended moment magnitude scale, often used by US seismologists, which measures the area of the fault that ruptured and the total energy released.