三维大地电磁感应参量研究
INVESTIGATION OF GEOMAGNETIC INDUCTION FUNCTION IN THREE-DIMENSIONAL STRUCTURES
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摘要: 本文讨论了大地电磁感应转换函数在使用上有争议的问题.用几个不同的三维(3D)模型计算了感应矢量和转换函数,特别对它们的虚部进行了分析.方形和矩形导电体的感应具有二维(2D)特征,其感应曲线可用来估计导体的埋深和范围.由二个埋深不同导体组成的结构,则表现出非二维特性,其感应函数曲线变化复杂,实虚矢量夹角大,两个转换函数的值即使在主轴方向也可能大小相当.Abstract: The application of the transfer function relation,Z = AH + BI),to induction study is briefly reviewed. Three dimensional (3D) models are used to calculate the induction vectors and transfer functions for investigating the properties of these quantities and particularly the property of their imaginary components. For square or rectangular conductive bodies with top surface parallel to the ground,the results show two dimensional (2D) behaviour. For a model consisting of two rectangular conductors buried at different depths,the calculated results show that the induction functions are more complex than 2D ones,the coefficients A and B can have similar magnitudes even in the direction of the major axes,and accordingly,the real and imaginary components may point in very different directions.
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[5] Beamish, D. and R. J., Banks, 19x3. Geomagnetic v.stiation anomalies in northern England:processing and presentation of data from a non——simultaneous array—— Ceophys. J. R. asrr. Soc., 75, 513——539.
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[7] Rokityansky, L. L.,1982. Geoelectromagnetic Investigation of the Earth's Crust and Maatle., p. 284,Springer——Verlag.
[8] Lilley, F. E. M. and D. J., Bennett, 1973. Linear reationships in geomagnetic variation studies. Phys. Earth Planet. Int, 7, 9——14. -
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