Geophysical aspects of man-made electromagnetic noise in the earth—A review

摘要: The paper gives a summary of geophysical aspects man-made electromagnetic noise in the Earth as follows: - EM distortion effects constructions below and over Earth's surface defined ‘passive-noise’, - field observation disturbances due to ‘active’ sources, - source mechanism some important active sources from point view, - efforts order improve signal-to ratio by instrumental, methodological dataprocessing ways, - application for prospecting.