Accordingly, there have been recent attempts to better understand the multiple inactive faults which are associated with the landforms of the Auckland region.

To the west is a greywacke and argillite-dominated Murihiku Terrane found south of Waikato heads but buried by, for example, the volcanic rocks of the Waitākere Ranges in the Auckland region.

The vents of the volcanoes of the coastal aspects of the ranges are inferred to align with one such fault with low confidence.

[4] The Cornwallis fault is largely inferred as the southern limit of the Waitākere Ranges being in the middle of the outlet of Manukau Harbour to the sea.

Under the city proper, there is a large number of inferred faults with at least moderate confidence from the sampling data.

[6] In the middle of the land portion of the rift, but outside the Auckland region, is the Kerepehi Fault in the Hauraki Plains.

Because it has the potential to have earthquakes greater than magnitude 7 its presence dictates current building codes in the Auckland region.

[4] There have been faults identified by seismic surveys off the west coast as part of oil exploration work.

[5] A line of extinct Miocene volcanic vents is found on the west coast of the North Island as the western border of the Waitākere Ranges.

A fault line called the Westcoast linement has been assigned with relatively low confidence to explain this alignment which is buried under the volcanic rocks associated with the former massive shield Waitākere volcano where the basement is almost 1 km (0.62 mi) or deeper.