Depth and structural index estimation of 2D magnetic source using correlation coefficient of analytic signal

Abstract

We presented using the correlation coefficient of the analytic signal of real data and the analytic signal of synthetic data generated by the assumed source to estimate the structural index and the depth of the source. First, we assumed that the causative sources are located at different locations in the underground and the structural index of the assumed source is changed from 0 to 3, and then we separately compute the correlation coefficients of the analytic signal of the measured data and the analytic signal of the anomaly generated by each assumed source, the correlation coefficient can get the maximum value when the location and structural index of the assumed source are consistent with the real source. We tested the correlation coefficient method on synthetic noise-free and noise-corrupted magnetic anomalies , and the inversion results indicate that the new method can successfully finish the inversion of magnetic data. We also applied it to measured magnetic data, and we obtain the structural index and the location of the source. ► The correlation coefficient is first used to compute the depth and structural index. ► The new method can estimate the depth and the nature of the source simultaneously. ► The correlation coefficient method is insensitive to noise. ► The correlation coefficient method is insensitive to magnetization direction.