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Prediction of Electromagnetic Noise using Spatial Modelling in Magnetotellurics  

Lee, Choon-Ki (Seoul National University, Dept. Earth Science Education)
Lee, Heui-Soon (Gyeongin National University of Education, Dept. Science Education)
Kwon, Byung-Doo (Seoul National University, Dept. Earth Science Education)
Publication Information
Geophysics and Geophysical Exploration / v.8, no.4, 2005 , pp. 251-261 More about this Journal
Abstract
The quality of MT (magnetotellurics) data highly depends on the level of artificial noise form industrial sources. We have conducted the feasibility study of MT noise modelling using digital spatial data and spatial modelling through the comparison between the predicted and the measured MT noises. A simple noise model predicting the intensity of electromagnetic field radiated from the latent noise sources, that is, the electric facilities in the building, road and high-voltage powerline, is developed in consideration of the propagation property of electromagnetic waves. From the analysis of correlation between the predicted and the measured noise power, the correlation coefficients of electric field are higher than those of magnetic field in whole frequency band. The magnetic field component has the high correlation in the narrow band near 60 Hz only. The spatial noise modelling proposed in this study would provide some useful informations for the MT surveys in the noisy environment like urban area.
Keywords
magnetotellurics; artificial noise; noise model; spatial modelling;
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