Generation of synthetic wide-band electromagnetic time series

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Abstract

The estimation of the earth transfer functions in MT prospecting method poses the greatest difficulty. As in the seismic prospecting method, this task requires the development of advanced processing techniques. In order to assess the performance of each technique, controlled synthetic data and different noise types, which simulate the observed signals, are required. This paper presents a procedure to generate a wide-band noise-free electromagnetic field to be used both for magnetotelluric and audio-magnetotelluric studies. Furthermore, an effort was made to extend the simulation procedures to generally stratified and simple inhomogeneous earth structures. The discrete-time magnetic field values are generated through the inverse Fourier transform of a continuous amplitude spectrum and a sampling procedure. The electric field time series are obtained by the convolution of the magnetic field time series, calculated in the interested frequency band, with a non-causal impedance impulse response. Polarized fields, which are important when inhomogeneous media are considered, are also generated.

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Loddo, M., Schiavone, D., & Siniscalchi, A. (2002). Generation of synthetic wide-band electromagnetic time series. Annals of Geophysics, 45(2), 289–302. https://doi.org/10.4401/ag-3506

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