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Story: Geology – overview

Subduction beneath the North Island

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Subduction beneath the North Island

This east–west cross-section through the central part of the North Island illustrates how the Pacific Plate descends (subducts) beneath the Australian Plate. The Australian Plate acts rather like a bulldozer’s blade, and the sediments on top of the Pacific Plate are scraped off and crumpled, forming the hills of the Wairarapa and Hawke’s Bay.

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GNS Science

Source: Ray Wood and others, New Zealand’s continental shelf and UNCLOS Article 76. Lower Hutt: Institute of Geological and Nuclear Sciences; Wellington: National Institute of Water and Atmospheric Research, 2003

Permission of GNS Science must be obtained before any use of this image.

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How to cite this page

Eileen McSaveney and Simon Nathan, Geology – overview – New Zealand – a geological jigsaw puzzle, Te Ara – the Encyclopedia of New Zealand, https://teara.govt.nz/en/diagram/8284/subduction-beneath-the-north-island (accessed 11 June 2026).

Story by Eileen McSaveney and Simon Nathan, published 2 March 2009.