Electrical conductivity from Australian magnetometer arrays using spatial gradient data

Details Electrical conductivity from Australian magnetometer arrays using spatial gradient data Electrical conductivity from Australian magnetometer arrays using spatial gradient data

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...25..202l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 25, Issue 3, p. 202-209.

Physics

24

Scientific paper

Quiet daily magnetic variations recorded by magnetometer arrays in Australia are analysed to obtain electromagnetic response parameters for two parts of the Australian continent remote from electrical conductivity anomalies. The parameters are based on measurements of vertical-field and horizontal-field spatial gradient, and three different methods are followed in their computation. The response parameters are checked for consistency with a compilation of globally-determined Earth apparent resistivities, and are then interpreted for one-dimensional conductivity structure in the two different parts of the continent. There is evidence that the rise in electrical conductivity from 10-1 S m-1 to 100 S m-1 which occurs at a depth of order 500 km beneath central Australia may occur at a substantially shallower depth of order 230 km beneath southeast Australia.

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