天然电磁场测深

本文系作者十余年来研究该一新的物探方法的理论总结与实测成果介绍，天然电磁场是一个随机场，作者于其中找到了一个并不随机的稳定量；任一方向的磁场与其垂直方向的电场的比值。引入一个多层岩层相叠时其表面对电磁波入射的总反射系数的概念，从而导出了方法的正反演计算式及相应仪器的设计方案，并制造了测深仪器。

Nature Source Electromagnetic Sounding

The theory of nature source electromagnetic sounding technique and its applications are presented in this paper. Natural electromagnetic field is of randomness. It is proved that the ratio between the magnetic component of the EM field and the electric component being perpendicular to it is not of randomess. By defining a total reflection coefficient of natual EM field over multi layered medium, the forward and inversion equations for nature soutce EM sounding are established. The development of the instrument for nature source EM sounding is also introduced in the paper. Applications in nineteen sites show that the technique developed is valid and powerful.