Non-stationary time series analysis ? MT applications

Abstract

The EMSLAB data set (Jones et al., 1989) has been processed using time-frequency methods to estimate the apparent resistivities and phases. When compared to the results from traditional methods, the time-frequency analysis has produced different apparent resistivity estimates for the noisier component, while the phases and the apparent resistivity estimates for the component with the stronger signal are very similar. This is consistent with the bias being due to nonstationary effects, and could indicate that this type of analysis will significantly improve the quality of magnetotelluric data.