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Southwest Seismic Zone of Western Australia: measurement of vertical ground movements by repeat levelling and gravity surveys

Created 16/10/2025

Updated 16/10/2025

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This paper presents results of repeat surveys of levelling and gravity, analysed to determine areas of vertical ground movement in the Southwest Seismic Zone, 75-200 km east of Perth. Levelling surveys over parts of the earthquake zone have been made during four periods, starting in 1958. Differences between repeat levelling surveys separated by 10 or more years show areas of vertical ground movement, the areas being 20-50 km across with relative height changes of 50-100 mm amplitude. Some of the vertical ground motion is movement at the time of earthquakes, some is later rebound in the same earthquake areas, and other movement does not appear to be associated with large or small earthquakes and could be due to either elastic strain, or non-seismic faulting. Precise gravity observations at 10 km spacing were made in 1980-81 and repeated in 1983. The differences between the surveys do not show any significant gravity changes. Future studies should be set up to monitor stress, strain and earthquakes in a group of small, diverse test areas, using the global positioning system.

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Field Value
Title Southwest Seismic Zone of Western Australia: measurement of vertical ground movements by repeat levelling and gravity surveys
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/9c86e7b5-d591-4558-a83b-e1e9db9974cd
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        111.13,
        -35.85
      ],
      [
        130.29,
        -35.85
      ],
      [
        130.29,
        -18.76
      ],
      [
        111.13,
        -18.76
      ],
      [
        111.13,
        -35.85
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Southwest Seismic Zone of Western Australia: measurement of vertical ground movements by repeat levelling and gravity surveys". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/southwest-seismic-zone-of-western-australia-measurement-of-vertical-ground-movements-by-repeat-