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| | Abstract | | Data processing is one of the essential techniques to obtain accurate geophysical responses of the earth. Various digital filters have been applied to process seismic data successfully. On the other hand, there are only a limited number of examples in which digital filters are applied in the processing of electro-magnetics data, since the Fast Fourier Transform (FFT) is conventionally used for the analysis. We consider that the application of digital filters to electro magnetics data is effective for obtaining high-quality results as well as to seismic data. We focused a digital filter called pole-on-pedestal in the Z transform in this study. Pole-on-pedestal filter emphasizes and extracts Fourier component at a specific frequency with less distortion of spectrum than in FFT. The application of our pole-on-pedestal filter to a synthetic data shows that the filter is not sensitive to the number of samples compared to FFT. Finally, we applied this digital filter to the real field data acquired for a marine deep towed DC resistivity survey. The result demonstrates that the filter successfully extracts signals accurately enough to discuss the resistivity structure below the sea floor than in the other conventional processing using FFT. |
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