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    Magnetotelluric, Basin Structure and Hydrodynamics; South West of Western Australia

    Access Status
    Fulltext not available
    Authors
    Bibirabea, S.
    Harris, Brett
    Schaa, R.
    Pethick, A.
    Costall, A.
    Duan, J.
    Jiang, W.
    Date
    2018
    Type
    Conference Paper
    
    Metadata
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    Citation
    Bibirabea, S. and Harris, B. and Schaa, R. and Pethick, A. and Costall, A. and Duan, J. and Jiang, W. 2018. Magnetotelluric, Basin Structure and Hydrodynamics; South West of Western Australia, Australasian Exploration Geoscience Conference.
    Source Conference
    Australasian Exploration Geoscience Conference
    DOI
    10.1071/ASEG2018abP095
    Additional URLs
    https://doi.org/10.1071/ASEG2018abP095
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/68804
    Collection
    • Curtin Research Publications
    Abstract

    A prominent TE and TM mode split is observed in magnetotelluric (MT) data below 0.5 Hz collected in the Perth Basin over the Harvey Ridge, Western Australia. We investigate the causes of mode splitting and consider implications on inversion of the MT data to subsurface electrical conductivity distribution. Twenty-five broad-band MT stations were acquired and remote reference processing was completed to arrive at a data set located midway between the Darling Fault and the Indian Ocean. We used forward modelling to test our strong suspicion that the Indian Ocean, Darling fault and architecture of the Granitic Basement were indeed the major contributors to mode splitting that we observed. Forward modelling of synthetic data was completed for comparison with the Harvey MT data. We were surprised at the match between synthetic and field data given the simplicity of the forward model and the considerable lateral distance between the MT soundings and the Indian Ocean or Darling fault. We were then able to make significant improvements to the MT inversion outcome by introducing a large scale geo-electrical architecture as the seed model for inversion. Our work demonstrates that large scale geo-electrical contrasts at considerable lateral distance from an MT transect, or the target zone need to be systematically introduced to the inversion if a quality outcome is to be achieved

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