【摘要】 本文在电导率随深度分层线性变化的地球模型上,研究了大地电磁的正演问题.由Airy微分方程导出了电场和磁场水平分量的解、地面阻抗的递推表达式和视电阻率的计算公式;并证明了分层线性模型与均匀层状模型一样,也存在高阻薄层的H等值性和低阻薄层的S等值性;总结了电导率随深度的变化率α,对大地电磁测深曲线的影响规律.更多还原

【Abstract】 Magnetotelluric (MT) forward problem is stulied for a vertically inhomogeneous earth having conductivity varying linearly with depth by layers in this paper. Base on solving an Airy differential equation, solutions are led for the horizontal components of the electric and magnetic fields under above geo-electric conditions. Then, the surface impedance iteration formulation and apparent resistivity computed formulation are obtained in terms of Airy functions. We studied the properties of the MT sounling curves in this case, and proved linear-layered models existing high-resistivity thin layer H equivalence and low-resistivity thin layer S equivalence as homogenous layered models having.更多还原