Abstract:Data processing of magnetotelluric (MT) survey has been based on the Fast Fourier Transform (FFT). The FFT processing gives us the response functions (RFs) of the earth fast and easily. However, applying FFT processing to MT data may not be optimum always, since the source of MT is the transient fluctuation of electric current in the ionosphere. The FFT assumes time series to be a stationary so that we focused on an IIR filter called 'pole on pedestal' that extracts the signal at a specific frequency. Combinin… Show more
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