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Mapping the disruption of source magnetization depth estimates by near-surface magnetisations

Created 17/10/2025

Updated 17/10/2025

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Near-surface magnetizations are ubiquitous across many areas of Australia and complicate reliable estimation of depth to deeper magnetizations. We have selected four test areas in which we use equivalent source dipoles to represent and quantify the near-surface magnetizations. We present a synthetic modelling study that demonstrates that field variations from the near-surface magnetizations substantially degrade estimation of depth to a magnetization 500 metres below the modelled sensor elevation and that these problems persist even for anomalies with significantly higher amplitudes. However, preferential attenuation of the fields from near surface magnetizations by upward continuation proved quite effective in improving estimation of depth to those magnetizations. This Abstract was submitted/presented at the 2023 Australasian Exploration Geoscience Conference (AEGC) 13-18 March (https://2023.aegc.com.au/)

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Field Value
Title Mapping the disruption of source magnetization depth estimates by near-surface magnetisations
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/b3bc922c-5c60-4c75-b891-5abbfd15c9a9
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 24/02/2023
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        112.0,
        -44.0
      ],
      [
        154.0,
        -44.0
      ],
      [
        154.0,
        -9.0
      ],
      [
        112.0,
        -9.0
      ],
      [
        112.0,
        -44.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Mapping the disruption of source magnetization depth estimates by near-surface magnetisations". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/mapping-the-disruption-of-source-magnetization-depth-estimates-by-near-surface-magnetisations