A marine and beach tsunami warning for parts of New Zealand has now passed, following a magnitude 8.2 earthquake in Chiapas, Mexico.
The warning, issued before midnight on Friday, applied to Chatham Islands, Pegasus Bay, northern coasts of Hawke's Bay and East Cape only.
"There is NO land threat. No evacuation is necessary," Civil Defence tweeted earlier.
Unusually strong and hazardous currents and unpredictable surges were expected near beaches, and in harbours and estuaries from about 7am on Saturday, Civil Defence said.
Initially it had said there was no threat but officials revised that.
The quake was apparently stronger than a devastating 1985 tremor that flattened swathes of Mexico City and killed thousands but initial reports of damage in the city were limited.
The epicentre was 123km southwest of the town of Pijijiapan in the southern state of Chiapas, at a revised depth of 69km, the US Geological Survey says.
The death toll has been revised up to 58.
The New Zealand embassy in Mexico City is monitoring the situation closely and has had no requests for consular assistance to date, the Ministry of Foreign Affairs and Trade said.
There are currently 103 New Zealanders registered as being in Mexico.