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“地-电离层”模式有源电磁法由于其在地球物理勘探和地震预报方面的良好应用前景,成为地球物理电磁法研究新的热点.近年来国内开始了“地-电离层”模式有源电磁法研究,作者已经实现了当地球层为均匀半空间时的正演,但实际上地球并不是均匀半空间.本文在此基础上,采用R函数法进行公式推导,以高采样密度的Hankel滤波系数实现数值模拟,给出多层地球层的正演结果.结果表明,“地-电离层”模式有源电磁法的探测能力,与CSAMT/MT类似,但由于电离层的影响,导致在大收发距的时候,出现了波导场,场强衰减变小;由于空气中位移电流的影响,导致电磁场在轴向和赤道两个方向上的衰减出现了差异,轴向方向的衰减更小.
Because of its good application prospects in geophysical prospecting and earthquake prediction, the “ground-ionosphere” mode active electromagnetic method has become a new hot spot in geophysical electromagnetic research. In recent years, the “electromagnetic ionospheric” “In the study of mode active electromagnetic method, the author has realized the forward when the local Earth’s sphere is a uniform half-space, but in fact, the Earth is not a homogeneous half-space.Based on this, we use the R-function method to deduce the formula, The Hankel filter coefficients of sampling density are used to simulate the numerical results and the forward results of multi-layer earth layers are given. The results show that the detection capability of the ”ground-ionosphere" mode active electromagnetic method is similar to that of CSAMT / MT, Layer, the waveguide field appears when the distance between the transmitter and the receiver decreases, and the attenuation of the field decreases. Due to the influence of the displacement current in the air, the attenuation of the electromagnetic field in the axial direction and the equatorial direction appears different. Decay in the direction of smaller.