A TSUNAMI alert for New Zealand and Tonga was cancelled today but a risk of dangerous seas remained after a strong 7.7 undersea earthquake, officials said.
The Pacific Tsunami Warning Centre (PTWS) issued the tsunami warning after the quake struck off New Zealand's Kermadec Islands at 7.03am (NZT) at a depth of just 1km.
Tsunami waves were measured off Raoul Island, one of New Zealand's Kermadec Islands, up to a height of 0.84 metres above normal sea level, the centre said.
"Sea level readings confirm that a tsunami was generated," the centre said.
"This tsunami may have been destructive along coastlines of the region near the earthquake epicentre."
However tsunami alert was cancelled shortly after 6.30am (AEST).
The quake struck at 7.03am today (NZT) at a depth of just 1km, the United States Geological Survey (USGS) said.
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