Article : Comparison of two techniques for magnetotelluric data processing using synthetic data sets
Authors : Czuba, W.Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, email@example.com, Domański, B.Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, firstname.lastname@example.org, Wiejacz, P.Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, email@example.com, Kostecki, A.Oil and Gas Institute, Kraków, Poland, firstname.lastname@example.org, Ernst, T.Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, email@example.com,
Abstract : The mathematical backgrounds and the computer program for the generation of synthetic magnetotelluric (MT) data sets are presented in the first part of this paper. The imitation approach provides the possibility to calculate MT time series with the a priori assigned signal properties similar to the properties of natural MT fields and realistic (but controlled) structure of the noise added to the signal. The transfer operator (impedance) connecting MT fields is known; thus, the processing of these data sets gives a possibility of direct comparison of estimated and “true” impedance elements and provides the objective study of the efficiency of MT processing techniques at the quantitative level. In the second part of the paper, first results of such a study of two MT processing codes with different mathematical formulation are discussed. The PRC system is based on the generalized harmonic analysis and frequency domain selective weighting and robust estimators, while the essence of the code of Wielądek and Ernst is the solution of the time domain integral equation. These two techniques are jointly checked on the basis of two seven-day long synthetic MT time series designed in the frames of the COMDAT processing software comparison project. The first test contains pure MT signal, and in the second one the same signal is disturbed with significant additive noise of different nature. The surprisingly good convergence of the estimates of both codes to the “true” impedance responses is reported.
Qute : Czuba, W. ,Domański, B. ,Wiejacz, P. ,Kostecki, A. ,Ernst, T. ,Ernst, T. , Comparison of two techniques for magnetotelluric data processing using synthetic data sets. Acta Geophysica Polonica Vol. 49, nr 2/2001