Potential tsunami threats were issued for Vanuatu, Fiji and New Caledonia, the Pacific Tsunami Warning Centre (PTWC) said.
The Bureau of Meteorology (BOM) issued a warning of a marine threat for Lord Howe Island, off Australia's east coast, after the earthquake on Friday afternoon.
"So far, a 22-centimetre tsunami wave has been observed near New Caledonia," the BOM said in its warning notice on Friday afternoon.