Tsunami

New Tsunami Information - December 2019

A new report by Environment Canterbury contains updated tsunami modelling that has implications for the Waimakariri District.

It shows that in worst-case scenarios, flooding from a tsunami may travel further inland than previously thought.

We won't know the full risks to the District or how our tsunami evacuation zones may be affected until modelling for the entire Pegasus Bay is completed in late 2020 - however some of the information provided below is likely to change.

Read more about the modelling on this page or on the ECan website.

The 7.8m Kaikoura earthquake, and aftershocks highlighted New Zealand’s risk from earthquakes and tsunami.

Councils play an important role, as leaders in your community, helping to mobilise people in all regions of New Zealand to take the right action.

These are the key things to remember:

  • All of New Zealand is at risk of earthquakes and all of our coastline is at risk of tsunami. Knowing the right immediate action to take can prevent injury and save lives.
  • In an earthquake, Drop, Cover, Hold. It makes you a smaller target, stops you being knocked over and protects your head, neck and vital organs.
  • During a tsunami warning, remember Long or Strong, Get Gone.  If you are near the coast, in an earthquake that rolls for more than a minute OR makes it hard to stand up, don’t wait for a tsunami warning. Move to high ground or as far inland as you can (west of State Highway One). Walk if you can. Stay there until you get the all clear.

Make a plan today.  Know where to go, and find out who can help you and who might need your help.

Council emergency management staff have further information about tsunami response plans for the district.

Warning time for a distant source tsunami could be as much as 12 hours, regional source could be as much as three hours. There will be no warning time for a near source tsunami. For further information on the Council's public warning system for tsunami, please see Tsunami warning arrangements - public information (pdf, 19.1 KB) .

  • The most likely tsunami scenario for Pegasus Bay is a tsunami from South America - this gives approximately 12-15 hours to issue warnings and evacuate people
  • While we can't completely rule out a damaging local source tsunami generated in Pegasus Bay, all indications are that the likelihood of this is low.

Tsunami Plans