Authors / CoAuthors
Dhu, T. | Milligan, P.R. | Curnow, S. | Adam, H. | Fomin, T.
Abstract
Magnetotelluric (MT) data were acquired in September 2009 in a collaborative project by Primary Industry and Resources, South Australia (PIRSA), Geoscience Australia and the University of Adelaide (UA) along the east-west southern Flinders ranges seismic traverse in South Australia. The seismic and MT data acquisition are part of the Australian Government's energy security program, with main funding being provided by PIRSA under the Plan for Accelerating Exploration (PACE) initiative. The MT data form a valuable complimentary addition to the seismic data for the investigation of energy potential and crustal architecture of this region. National facility Auscope MT instruments based at UA were used (through ANSIR agreement) to record both broadband data with a frequency range 200 Hz to 0.008 Hz and long period data with a frequency range of 10 Hz to 0.0001 Hz. This enables sensing of Earth electrical conductivity from near-surface in the crust to depths well below the Moho. Two orthogonal components of the magnetic field were measured with induction coils for the broadband acquisition, and three components of the magnetic field were recorded with fluxgate sensors for the long-period data. Two horizontal components of the electric field were measured at each site with orthogonal NS and EW dipoles ~50 m long. Data were recorded at fifteen sites with a nominal spacing of 10 km covering a profile ~150 km in length. Data are processed to industry standard EDI files prior to the generation of apparent resistivity and phase plots. A suite of plots are created to investigate dimensionality including, skew angle, phase tensor ellipses and Parkinson arrows. Parkinson arrows point to regions of high conductance and away from more resistive blocks. Preliminary analysis of the long period data has revealed that the Parkinson arrows generally point to the east at higher frequencies. At lower frequencies these arrows swing southerly pointing to the south east.
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nonGeographicDataset
eCat Id
70058
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- External PublicationConference Paper
- ( Theme )
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- magneto-tellurics
- ( Theme )
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- seismics
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- AU-SA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2010-01-15T00:00:00
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