Story: Magnetic field

Magnetic field strength, Taupō volcanic zone

Magnetic field strength, Taupō volcanic zone

This aeromagnetic map of the Taupō volcanic zone shows areas where the earth’s magnetic field is higher than normal (red) and lower than normal (blue). Volcanic lavas (between Taupō and Lake Rotorua) are often rich in magnetic minerals and produce an increase in the strength of the magnetic field. Geothermal areas (near the Waikato River) are associated with magnetic lows.

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How to cite this page:

Tony Hurst, 'Magnetic field - Magnetic measurements in New Zealand', Te Ara - the Encyclopedia of New Zealand, (accessed 22 May 2022)

Story by Tony Hurst, published 12 Jun 2006