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Regional variation of gravity, and isostatic equilibrium if the Australian crust

Created 16/10/2025

Updated 16/10/2025

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In eastern Australia free-air anomalies and altitudes averaged over 1° x 1° areas show a positive correlation of +0.059 ± .004 mGal. m^-1. lsostatic compensation of topography and crustal masses is thought to be mainly at the base of the crust, but partly deeper in the mantle, and to be almost complete for 1° x 1° areas. In central and western Australia free-air anomalies and altitudes have a zero or slightly negative correlation with a larger scatter; isostatic compensation is thought to be complete only for 3° x 3° areas and to be predominantly at the base of the crust. The deeper compensation in eastern Australia is thought to be related in some way to the youth of the crust and the presence of a low velocity zone at about 130 km. Elsewhere in the world Phanerozoic areas have a positive free-air anomaly altitude correlation, and Precambrian areas a negative correlation; so the different modes of isostatic compensation found in Australia may apply to crust of similar age elsewhere in the world. In Australia the residual 1° x 1° area anomalies found by removing altitude, long wavelength and sedimentary effects generally have an amplitude of 30 mGal and a wavelength of 6°; they are thought to be due to isostatically compensated variations in crustal density. Using these anomalies, variations in crustal thickness are predicted.

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Field Value
Title Regional variation of gravity, and isostatic equilibrium if the Australian crust
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/cbc86a56-7100-4797-9b0a-abe03629f52c
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        110.0,
        -44.0
      ],
      [
        156.0,
        -44.0
      ],
      [
        156.0,
        -9.0
      ],
      [
        110.0,
        -9.0
      ],
      [
        110.0,
        -44.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Regional variation of gravity, and isostatic equilibrium if the Australian crust". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/regional-variation-of-gravity-and-isostatic-equilibrium-if-the-australian-crust