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| AN ANALYSIS OF THE MAGNETOTELLURIC STRONG INTERFERENCE TYPES IN ORE CONCENTRATION AREAS |
| XU Zhi-min, TANG Jin-tian, QIANG Jian-ke |
| College of Geosciences and Info-physics, Central South University, Changsha 410083, China |
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Abstract Based on magnetotelluric data of Luzong area of Anhui Province, the authors studied the effects of various interference noises on magnetotelluric sounding data, made frequency spectrum analysis of several noise interference signals, and presented time series characteristics of relevant interference signals as well as apparent resistivity-phase curves. This paper has clarified the fact that noise interference that affects magnetotelluric sounding data can be divided into field source noise, geological noise and other interference noises caused by instabilities of outer factors and the observation system, which are derived from different sources. The results obtained by the authors show that the geological noise generally affects the whole frequency domain, the near-field interference mainly affects limited frequency of the high frequency, and the instability of the large power electric system mainly affects low frequency. Some suggestions are put forward in this paper for eliminating or reducing various kinds of noise interference.
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Received: 23 March 2011
Published: 10 April 2012
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