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Gawler Block (Whyalla, Lincoln, Maitland), SA, 1975 (75SA02_03) (74io) (P427), magnetic line data, AWAGS levelled

Created 17/10/2025

Updated 17/10/2025

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Total magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field 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 data are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. These line dataset from the Gawler Block (Whyalla, Lincoln, Maitland), SA, 1975 (75SA02_03) (74io) survey were acquired in 1975 by the SA Government, and consisted of 30920 line-kilometres of data at 1500m line spacing and 150m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.

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Additional Info

Field Value
Title Gawler Block (Whyalla, Lincoln, Maitland), SA, 1975 (75SA02_03) (74io) (P427), magnetic line data, AWAGS levelled
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/c30374a5-adfa-488f-9274-54c9a96e6c45
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 26/03/1975 - 15/05/1975
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        135.5169,
        -35.1436
      ],
      [
        138.3714,
        -35.1436
      ],
      [
        138.3714,
        -32.8583
      ],
      [
        135.5169,
        -32.8583
      ],
      [
        135.5169,
        -35.1436
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Gawler Block (Whyalla, Lincoln, Maitland), SA, 1975 (75SA02_03) (74io) (P427), magnetic line data, AWAGS levelled". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/gawler-block-whyalla-lincoln-maitland-sa-1975-75sa02_03-74io-p427-magnetic-line-data-awags-leve