Robust error on magnetotelluric impedance estimates. (7th January 2013)

• Record Type: Journal Article
• Authors: Wawrzyniak, Pierre; Sailhac, Pascal; Marquis, Guy
• Is Part Of: Geophysical prospecting. Volume 61:(2013:Jun.)supplement s1
• Page Start: 533
• Page End: 546
• Publication Date: 2013-01-07
• Subjects: Electromagnetics -- Passive methods -- Monitoring -- Data processing -- Signal processing; Prospecting -- Geophysical methods -- Periodicals; 622.15
• DOI: 10.1111/j.1365-2478.2012.01094.x
• Languages: English
• ISSNs: 0016-8025

Abstract

ABSTRACT: 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.