Tests of tsunami warning sirens are being carried out in many coastal areas today.
Sirens in Christchurch, located from Brooklands to Taylors Mistake, will sound for up to three minutes at 11am.
In Auckland the tests are are at midday at Point Wells, Whangateau, Omaha, Waiwera, Bethells Beach Te Henga, Piha North, Piha South, Karekare, Whatipu, Little Huia, Huia, Te Atatu South, Harbour View Road, Te Atatu Peninsula North, Westpark Marina, Hobsonville Airbase (Harrier Point) and Herald Island.
Napier City Council is testing its sirens for five minutes from 11.50am.
Councils are asking for feedback from residents as to how well they heard the sirens.
In Napier an online survey can be completed noon today, and a form will be printed in local community newspapers on Wednesday that can be sent in.
All completed entries will go in the draw to win an emergency water tank and a $100 supermarket voucher.
The tsunami warning systems are designed to forewarn of a distant source tsunami that could take several hours to arrive. In the event of a tsunami a wide range of communication methods will be used.