Putting liquefaction on the map

A map outlining the risk of liquefaction in the Far North can now be viewed on our website, giving property owners, planners, and engineers a clearer understanding of potentially vulnerable areas.

Liquefaction occurs during an earthquake when water-saturated soil loses its stability and behaves like a liquid. It can lead to significant damage to buildings.

In 2019, the Ministry of Business, Innovation and Employment (MBIE) recommended all New Zealand councils start hazard mapping to identify susceptible areas. While the Far North is a relatively low-risk area for earthquakes compared to the rest of New Zealand, the hazard does exist.

The liquefaction map, produced by Vision Consulting Engineers in Kerikeri, can help the public and council identify the likelihood of damage using three categories: unlikely, undetermined, and possible. Most of the Far North is classed as unlikely, with some coastal areas deemed possible.

Ben Perry, Managing Director at Vision Consulting Engineers, highlights the significance of this initiative. "Knowing an area's likelihood of damage due to liquefaction empowers property owners to take appropriate action, such as reinforcing a building's foundation,” he says. “It also aids the council and civil defence in land use and emergency planning.”

To find out which classification your property is in, click here to view the map.

Photo: Liquefaction occurs during an earthquake and can cause significant damage.