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Analogue model study of EM induction in elongated conductors—2D and 3D induction arrow responses
Earth, Planets and Space volume 52, pages355–360(2000)
Magnetic induction arrow responses of elongated conductors embedded in a uniformly resistive host earth and underlain by a conductive substratum are studied with the aid of laboratory analogue model measurements. The dependence on period, the overburden depth, and the underlying conductive basement depth, are examined for three different conductor lengths that were chosen so as to include the transition in the responses from two dimensional (2D) to those of three dimensional (3D) structures. The characteristic period T c (the period at which the in-phase anomalous response of the elongated conductor model is maximum and the quadrature response is minimum) is found to depend on the conductor length, the overburden depth, and the conductive basement depth. A decrease in conductor length or conductive basement depth, each have the effect of decreasing both the response amplitude and the characteristic period, while increasing the overburden depth has the effect of increasing the characteristic period and decreasing the response amplitude. At short periods, say below the characteristic period, the responses appear to be roughly 2D, and to become progressively more 3D-like with increasing period above the characteristic period.
Agarwal, A. K. and H. W. Dosso, On the behaviour of the induction arrows over a buried conductive plate—a numerical model study, Phys. Earth Planet. Inter., 60, 265–277, 1990.
Agarwal, A. K. and H. W. Dosso, The characteristic periods of the induction arrows for a conductive-resistive vertical interface—a numerical model study, Phys. Earth Planet. Inter., 7, 67–74, 1993.
Agarwal, A. K. and H. W. Dosso, EM induction in alarge conductive block— a 3D numerical study, 2000 (submitted).
Chen, J. and H. W. Dosso, EM responses of an elongated conductor near an ocean—analogue model studies, Phys. Earth Planet. Inter., 99, 83–89, 1997.
Chen, J., H. W. Dosso, and S. Kang, EM induction in elongated conductors normal to a coastline with application to geomagnetic measurements in Nigeria, J. Geomag. Geoelectr., 49, 1401–1414, 1997.
Chen, P. F. and P. C. W. Fung, On the behaviour of the imaginary Parkinson arrows near the anomalous conductive-host medium interface, Phys. Earth Planet. Inter., 50, 195–198, 1987.
Dosso, H. W., A review of analogue model studies of the coast effect, Phys. Earth Planet. Inter., 7, 294–302, 1973.
Lilley, F. E. M. and B. R. Arora, The sign convention for Parkinson arrows in geomagnetic induction studies, Rev. Geophys. Space Phys., 20, 513–518, 1982.
Nienaber, W., D. Hebert, and H. W. Dosso, Induction arrows for a buried conducting plate, Phys. Earth Planet. Inter., 32, 306–311, 1983.
Rokityansky, I. I., Geoelectromagnetic Investigation of the Earth’s Crust and Mantle, Springer-Verlag, Berlin, 287 pp., 1982.
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Dosso, H.W., Chen, J. Analogue model study of EM induction in elongated conductors—2D and 3D induction arrow responses. Earth Planet Sp 52, 355–360 (2000) doi:10.1186/BF03351647
- Skin Depth
- Characteristic Period
- Conductive Substratum
- Basement Depth
- Quadrature Response