Tsunami Zones Explained
This page explains what the coloured tsunami evacuation zones mean.
What do the different tsunami zone colours mean?
Tsunami come in different sizes, and we don't want to evacuate people who are actually not in danger, so we have a series of evacuation zones that we can use, based on the size of the tsunami that may be going to affect us.
If we receive warning of a tsunami, you will be told which zones to evacuate. For example, if we say to evacuate the red and orange evacuation zones, then people in those zones should leave, but people in the yellow evacuation zone do not need go.
You should immediately evacuate ALL of the zones if there is a large local earthquake where it is hard to stand up, or a rolling earthquake that lasts for more than a minute, or if you see or hear the ocean behaving strangely. A tsunami may be only minutes away, and we will not have time to give you a warning.
Red evacuation zone
Even small tsunami can have dangerous effects on tidal currents within Porirua Harbour and along the coast, making swimming and boating dangerous. Due to unpredictable surges, people will be asked to stay off all beaches, as well as out of the water. Our red evacuation zone includes the harbour, as it's so shallow.
Orange evacuation zone
If we have warning of a larger tsunami, we may need to evacuate homes or businesses which are close to the shore.
For the largest tsunami, we may need to evacuate homes and businesses in the yellow evacuation zone as well, but a tsunami of this size is extremely rare.
You should immediately evacuate ALL of the zones if there is a large local earthquake.