天然电磁辐射测深技术及其装置的研究简况

A BRIEF INTRODUCTION TO THE RESEARCH WORK AND APPARATUS FOR SOUNDING WITH NATURAL ELECTROMAGNETIC RADIATION

概述了被动式接收装置可利用的天然场源及其特性．在讨论地下地质结构对天然电磁辐射的响应时，采用水平成层的地质结构模型进行分析，证明所得到的地表电磁场与大地电磁法的观测对象是一致的．在分析利用大地电场分量探测地下地质结构的可能性与可行性后，提出了对观测装置的基本要求．最后，列举了利用所研制的装置进行实测及根据大地电磁法数据进行方法验证的结果．

The characteristics of the natural field sources which may used for passive receiving measurements are described.The response of the subsurface to the natural electromagnetic radiation is discussed and a horizontal layered stratum model is adopted in this analysis,It is proved that the resulting field on the earth surface is the same as the object of observation of the MT method.The Possibility and feasibility of the use of electrotelluric field in the detection of geological structures are discussed; and the basic requirements for the observation apparatus are mentioned.Finally, some examples of observation with the prototype instrument and the results of electrotelluric measurement by observation with the MT method, as a check, are also mentioned.