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Robust error on magnetotelluric impedance estimates
Author(s) -
Wawrzyniak Pierre,
Sailhac Pascal,
Marquis Guy
Publication year - 2013
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.2012.01094.x
Subject(s) - magnetotellurics , residual , inversion (geology) , jackknife resampling , bounded function , tensor (intrinsic definition) , electrical impedance , algorithm , computer science , mathematics , geology , mathematical analysis , statistics , engineering , geometry , seismology , electrical resistivity and conductivity , tectonics , estimator , electrical engineering
We propose here a new, robust, methodology to estimate the errors on a magnetotelluric (MT) impedance tensor. This method is developed with the bounded influence remote‐reference processing (BIRRP) code in a single site configuration. The error is estimated by reinjecting an electric field residual obtained after the calculation of an impedance tensor into a tensor function calculation procedure. We show using synthetic examples that the error tensor calculated with our method yields a more reliable error estimate than the one calculated from Jackknife statistics. The modulus of realistic error estimates can be used as a quality control and an accurate inversion constraint of MT surveys. Moreover, reliable error estimates are necessary for new applications of MT to dynamic subsurface processes such as reservoir monitoring.