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Probabilistic inversion of high-frequency magnetotelluric data for cover thickness estimation in the Curnamona-Delamerian region

Created 26/03/2026

Updated 26/03/2026

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This release is part of Geoscience Australia's Resourcing Australia’s Prosperity initiative (RAPi). Resourcing Australia’s Prosperity is the Australian Government’s 35-year precompetitive geoscience initiative, led by Geoscience Australia, to accelerate the discovery of critical minerals and other resources, to support Australia’s net zero transition and enable responsible management of all resources. This work builds on the Exploring for the Future program. The Exploring for the Future program was a $225 m investment by the Australian Government for precompetitive information to inform decision-making by government, community and industry on the sustainable development of Australia's mineral, energy and groundwater resources. The program commenced in 2016 and concluded in 2024.

We applied a probabilistic approach to inverting high frequency magnetotelluric (MT) data collected by two recent surveys in the Curnamona-Delamerian Region: the Curnamona Cube survey by the University of Adelaide/AuScope and the Curnamona Cube Extension survey (https://doi.org/10.26186/147904) by Geoscience Australia as part of Exploring for the Future Program. The inversion employs multiple Markov chains in parallel to generate an ensemble of millions of resistivity models that adequately fit the data given the assigned data errors. The algorithm uses trans-dimensional Markov chain Monte Carlo techniques to solve for a probabilistic resistivity-depth model. This stochastic approach gives a thorough exploration of the model space and a more robust estimation of uncertainty than deterministic methods allow. We use the full width at half maximum (FWHM) statistic to quantify the uncertainty of a layer boundary interface, by finding the width in metres of the peak at half of its maximum probability.

This release package contains 1D probabilistic inversion results at 172 sites presented as graphical statistics summary, and cover thickness estimates interpreted from model results. Also released is the GA record that describes the MT data, methodology, results and conclusion remarks.

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Additional Info

Field Value
Title Probabilistic inversion of high-frequency magnetotelluric data for cover thickness estimation in the Curnamona-Delamerian region
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/c3b0dcf1-fccc-4a30-b3b7-44c65bb84067
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 10/10/2025 - 01/04/2026
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        138.0,
        -34.0
      ],
      [
        144.0,
        -34.0
      ],
      [
        144.0,
        -29.0
      ],
      [
        138.0,
        -29.0
      ],
      [
        138.0,
        -34.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Probabilistic inversion of high-frequency magnetotelluric data for cover thickness estimation in the Curnamona-Delamerian region". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/probabilistic-inversion-of-high-frequency-magnetotelluric-data-for-cover-thickness-estimation-i