Physics
Scientific paper
Oct 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967pepi....1...49e&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 1, Issue 1, p. 49-54.
Physics
7
Scientific paper
Electric and magnetic field variations have been recorded at four stations across the pre-Cambrian shield of south-western Australia. The data are obtained in digital form at one minute intervals. sElectric nd magnetic Fourier spectra are compared to investigate the resistivity structure below each station. The effect of the electric field orientation is investigated: for three of the stations, the E/H relationships are explained by maximum and minimum resistivities acting along orthogonal horizontal axes. The apparent resistivity, and the phase difference between the electric and magnetic fields are compared with theoretical magneto-telluric curves. The curves are compatible with a two layer model: an upper layer 200 km thick, and a lower layer of resistivity 10 ohm-metres. The resistivity of the upper layer increases from 103 ohm-metres at Tammin, near the west coast, to 105 ohm-metres at Rawlinna, on the Nullarbor plain. The smaller resistivity is ascribed to the sediments of the Perth basin, and a larger temperature gradient along the western boundary of the pre-Cambrian shield. The results give some indication of a low resistivity layer at 70 km depth, associated with the seismic low velocity layer.
Everett John E.
Hyndman Roy D.
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