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Total Magnetic Intensity (TMI) greyscale Image of Australia 2019

Created 16/10/2025

Updated 16/10/2025

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This image is a greyscale image of the Total Magnetic Intensity of Australia. Total magnetic intensity (TMI) data measures variations in the intensity of the Earth magnetic filed caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The image is created from the 2019 TMI grid with a grid cell size of ~3 seconds of arc (approximately 80 m). This image only includes airborne-derived TMI data for onshore and near-offshore continental areas. The image shows the magnetic response of subsurface features with contrasting magnetic susceptibilities. The image can also be used to locate structural features such as dykes.

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Additional Info

Field Value
Title Total Magnetic Intensity (TMI) greyscale Image of Australia 2019
Language English
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/cce8bf5d-43d9-429c-b7b1-80dd0dc716f4
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        112.503782,
        -43.922731
      ],
      [
        154.662932,
        -43.922731
      ],
      [
        154.662932,
        -9.026912
      ],
      [
        112.503782,
        -9.026912
      ],
      [
        112.503782,
        -43.922731
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Total Magnetic Intensity (TMI) greyscale Image of Australia 2019". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/total-magnetic-intensity-tmi-greyscale-image-of-australia-2019