Towards an electrical conductivity model for Australia
Titel:
Towards an electrical conductivity model for Australia
Auteur:
Corkery, R. W. Lilley, F. E. M.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 41 (1994) nr. 5 pagina's 475-482
Jaar:
1994-10
Inhoud:
A compilation of the gross surface geology of the Australian continent is presented. On a grid-scale of 180 km, electrical conductances are estimated down to a depth of 10 km for both the Australian continent and the surrounding oceans, and used to form a numerical 'thin-sheet' model. Within the continent, the greatest contributions to conductance come from the sedimentary basins. Otherwise, the oceans have the strongest effect. The response of the model to time-varying magnetic fields is computed for a period of 1 h, as a guide to the electromagnetic induction pattern to be expected regionally from known Australian geology. The coast effect, as observed, is well-modelled given the accuracy of the exercise. Within the continent, strong observed conductivity anomalies are not reproduced unless conductances along their paths are increased substantially. The model will benefit from refinement, and appears to be a practical way of establishing the general electromagnetic induction pattern of Australia, set in its surrounding seas.
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