A Study on Using Natural Source Super Low Frequency Electromagnetic wave to Explore Goaf

In virtue of the property of light, portable, and less affected by complex terrain, the natural source magnetotelluric method and explorer is superior in complicate terrain exploration in the field. Goaf, the waste part after mining, is a ruinous geologic hidden danger. Due to the act of gravity, the wall rocks of goaves probably sink and caving to cause ground falls and other geologic disasters. This paper introduces the theory and exploring method of using natural source super low frequency (SLF) electromagnetic wave to detect goaves. The effect of exploration was proved by comparing experiment results with well logging.