The quake struck just a day after another major quake.
Some strong and unusual currents may continue overnight.
"You'll be able to help yourself if you get prepared early."
"There is a danger to swimmers, surfers, people fishing, small boats and anyone in or near the water close to shore."
There could be "unusual currents" in the ocean on Friday.
Some coastal areas may see strong and unusual currents though.
Large swathes of the east coast have been told to seek higher ground.
A tsunami warning is in place for parts of the east coast of New Zealand.
It's important to factor COVID-19 into your emergency planning, Kiri Allen says.
