A massive earthquake measuring 7.4 on the Richter scale struck New Zealand on 13 November.
According to the US Geological Survey, the epicentre of the earthquake was just 75 miles north of Christchurch. The deadly quakes struck just after midnight, local time (11.02am GMT).
A tsunami arrived in the north-eastern coast about two hours later. Residents were warned to head inland or for higher ground along the entire coast.
"The first wave may not be the largest. Tsunami activity will continue for several hours," the ministry tweeted.
Waves are expected to arrive at the Chatham islands immediately - anyone in the Chathams should move to high ground urgently #eqnz— MCDEM (@NZcivildefence) November 13, 2016
Christchurch was at the centre of a disastrous earthquake in 2011. The tragedy had reduced the city into a rubble.
The quakes that were registered on 13 November were however stronger than those recorded in 2011.
Further details are awaited.