Improving magnetotelluric data processing methods
https://doi.org/10.33623/0579-9406-2016-4-40-46
Abstract
A magnetotelluric data processing code has been developed, which demonstrates high robustness to intense electromagnetic noise occurring in measured MT data. Key features of the code are specific approach for estimating different transfer functions and capability to utilize all four channels acquired at remote reference station. The code utilizes various techniques to reduce estimate errors, including robust Huber estimator, jackknife approach, improved remote reference technique and compensating for overestimation of power spectra. The proposed code has shown high efficiency in processing of low signal-to-noise data.
About the Author
D. V. Epishkin
Московский государственный университет имени М.В. Ломоносова, геологический факультет
Russian Federation
Russian Federation
References
1. Жданов М.С. Электроразведка М.: Недра, 1986. 316 с.
2. Семенов В.Ю. Обработка данных магнитотеллурического зондирования. М.: Недра, 1985.
3. Chave A.D., Thomson D.J., Ander M.E. On the robust estimation of power spectra, coherences, and transfer functions // J. Geophys. Res. 1987. N 92. P. 633-648.
4. Egbert G.D., Booker J.R. Robust estimation of geomagnetic transfer functions // Geophys. J. R. Astr. Soc. 1986. N 87. P. 173-194.
5. Egbert G.D., Livelybrooks D. Single station magneto-telluric impedance estimation: coherency weighting and the regression M-estimate // Geophisics. 1996. N 61. P. 964-970.
6. Gamble T.D., Goubau W.M., Clarke J. Magnetotellurics with a remote magnetic reference // Geophysics. 1979. N 44. P. 53-68.
7. Goubau W.M., Gamble T.D., Clarke J. Magnetotelluric data analysis: removal of bias // Geophisics. 1978. N 43. P. 1157-1166.
8. Jones A.G., Chave A.D., Egbert G. et al. A comparison of techniques for magnetotelluric response function estimation // J. Geophys. Res. 1989. N 94. P. 14 201-14 213.
9. Huber P.J. Robust Statistics. New York: John Wiley & Sons, 1981.
10. Larsen J.C. Transfer functions: Smooth robust estimates by least squares and remote reference methods // Geophys. J. 1989. N99. P. 655-663
11. Muller A. A new method to compensate for bias in magnetotellurics // Geophys. J. 2000. N 142. P. 257-269.
12. Sims, W.E., Bostick F.X., Smith H.W. The estimation of magnetotelluric impedance tensor elements from measured data // Geophysics. 1971. N 36. P. 938-942.
13. Zorin N., Epishkin D. Yakovlev A. A telluric method for natural field induced polarization studies // J. Appl. Geophis. 2015. N 23.
Review
For citations:
Epishkin D.V. Improving magnetotelluric data processing methods. Moscow University Bulletin. Series 4. Geology. 2016;(4):40-46. (In Russ.) https://doi.org/10.33623/0579-9406-2016-4-40-46
Views:
316
Email this article 
