An improved wavelet threshold for correcting static effects of MT

Abstract

In this study, we employ wavelet analysis, which involves low-frequency reconstruction, as well as a hard and a soft threshold function to suppress static effects. Our research has uncovered that the application of these methods results in an unjustifiable loss of anomalous information on the local geology, as an excessive or insufficient number of wavelet coefficients are removed. This observation serves as the basis for developing an improved wavelet thresholding method based on the discrete wavelet transform to suppress static effects. The experimental results demonstrate that the proposed method effectively suppresses static effects while preserving anomalous information on the local geology.