TRACMT (Robust TRansfer Function Analysis Code for MagnetoTellurics)
Robust transfer function analysis code for magnetotellurics. In TRACMT, you can use the RRMS estimator developed by Usui et al. (2024).
Yoshiya Usui, Makoto Uyeshima, Shin'ya Sakanaka, Tasuku Hashimoto, Masahiro Ichiki, Toshiki Kaida, Yusuke Yamaya, Yasuo Ogawa, Masataka Masuda, Takahiro Akiyama, New robust remote reference estimator using robust multivariate linear regression, Geophysical Journal International, 2024, ggae199, https://doi.org/10.1093/gji/ggae19_9
We developed the RRMS estimator by applying the robust multivariate linear regression S-estimator to the two-input-multiple-output relationship between the local EM field and the reference magnetic field that leads to the same equation as by the original remote reference method. The RRMS estimator can give an unbiased estimate of MT transfer function and suppress the influence of outliers in the local electric field and magnetic field.
Functional overview
Input file format: Text (Ascii) file / .ats files of Metronix instruments / .dat files of ELOG-MT
Prewhitening: Non-robust prewhitening / Robust prewhitening / Robust prewhitening with robust filter
Transfer function estimation method: Ordinary least square / Non-robust remote reference / Robust remote reference / RRMS estimator
Error estimation method: Parametric approach / Bootstrap method / Jackknife method
GitHub repository
Source codes, manuals, and sample input files of TRACMT can be downloaded from the following GitHub repository.
Release note
v1.2.0 Jun. 13, 2024: Initial release