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The magnetotelluric method has been widely used for the geophysical investigation and monitoring. Prompted by growing demand, investigators often record magnetotelluric data near urban areas significa...ntly disturbed by cultural noise. To cope with low-quality data, we have developed a calculation technique for deducing the magnetotelluric impedance based on the presence of noise. It can robustly separate the signal and the noise using a hybrid constrained least-squares method. We validate the applicability by examining its performance using real data and several synthetic examples. Our results demonstrate that the technique is effective in working out the magnetotelluric impedance from low-quality spectra.続きを見る
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