Tsunami warnings look to be cancelled as beach-goers who waited all day outside the water start heading home.

Civil Defence authorities have downgraded the tsunami warning for New Zealand. However, New Zealand authorities are warning that there could be surges for up to 24 hours.

Paua fishermen are diving back into the seas and surfers are out to catch waves even as tsunami warnings stay in place.

New Zealand east coastal areas aren't out of the woods yet, with Civil Defence authorities and scientists electing keep the tsunami warning in place.

Wave activity "appears to be stabilised" at previously-reported levels, Civil Defence Emergency Management says.

The first wave has reached the Chatham Islands, after a massive 8.8 magnitude earthquake hit Chile overnight. An official tsunami alert remains in place for New Zealand's entire east coast.

There's no mucking around when you go fishing in the Chathams.