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dc.contributor.authorBibirabea, S.
dc.contributor.authorHarris, Brett
dc.contributor.authorSchaa, R.
dc.contributor.authorPethick, A.
dc.contributor.authorCostall, A.
dc.contributor.authorDuan, J.
dc.contributor.authorJiang, W.
dc.date.accessioned2018-06-29T12:27:10Z
dc.date.available2018-06-29T12:27:10Z
dc.date.created2018-06-29T12:08:51Z
dc.date.issued2018
dc.identifier.citationBibirabea, 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.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/68804
dc.identifier.doi10.1071/ASEG2018abP095
dc.description.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

dc.relation.urihttps://doi.org/10.1071/ASEG2018abP095
dc.titleMagnetotelluric, Basin Structure and Hydrodynamics; South West of Western Australia
dc.typeConference Paper
dcterms.source.conferenceAustralasian Exploration Geoscience Conference
dcterms.source.placeAustralia
curtin.departmentWASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
curtin.accessStatusFulltext not available


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