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Otway Basin magnetic grid geodetic

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. This Otway Basin magnetic grid geodetic has a cell size of 0.001 degrees (approximately 99m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1994 by the SA, VIC Government, and consisted of 44345 line-kilometres of data at 500m line spacing and 130m terrain clearance.

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Additional Info

Field Value
Title Otway Basin magnetic grid geodetic
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/b73b49df-97b0-4b95-8724-a7d368156daf
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 06/05/1994 - 28/06/1994
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        140.1435,
        -39.1992
      ],
      [
        143.5825,
        -39.1992
      ],
      [
        143.5825,
        -38.0172
      ],
      [
        140.1435,
        -38.0172
      ],
      [
        140.1435,
        -39.1992
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Otway Basin magnetic grid geodetic". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/otway-basin-magnetic-grid-geodetic