A Parametric Method for Robust Magnetotelluric Transfer Function Estimation Evaluated with Data at Different Sampling Frequencies

Electromagnetic transfer functions (EMTFs) play a central role in interpreting the relationship between the magnetic and the electric fields, providing empirical information necessary for magnetotelluric (MT) technology. The proposed parametric method aims at estimating an EMTF based on system identification, making it possible to estimate EMTFs in the time domain with fewer parameters and data. Our prior studies have validated the effectiveness of the output-error (OE) model based parametric method with real MT data measured at USArray sites at a sampling frequency of 1 Hz. To further validate and explore the potential of this method for MT, in this study MT data at different sampling frequencies are considered, which can be used to consider the EMTF over a wider frequency band.