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Details of the abstract

Title of paper Constraining the 1-D electrical conductivity of the crust and mantle beneath
continents by the joint inversion of multi-source electromagnetic transfer functions
List of authors Author, R. Rigaud, Co-author, A. Kuvshinov, Co-author, A. Grayver, Co-author, F. Perrier, Co-author, M. Kruglyakov
Affiliation(s) ETH-Zürich, ETH-Zürich, ETH-Zürich, Institute de Physique du Globe de Paris, University of Otago
Summary In this study, we present an approach that enables probing the Earth’s conductivity structure from the crust to
the lower mantle beneath geomagnetic observatories equipped with electric field measurements. This
approach is based on a joint inversion of multi-source electromagnetic (EM) responses, namely,
magnetotelluric impedances and longer-period global-to-local (G2L) transfer functions (TFs) originating from
signals due to ionospheric and magnetospheric sources. Using the G2L TFs paradigm instead of the
conventionally used C-responses allows us to account for the spatial complexity of the external sources. We
validate the approach by inverting the responses estimated from the magnetic and electric data collected at
the Chambon-le-Foret (CLF) geomagnetic observatory in France. We discuss the incurred challenges when
working with CLF data, which arise due to the contamination of daily variations of ionospheric origin with the
signals induced by the oceanic tides. We mitigate this problem through a high-resolution 3-D modelling of tidal
signals and their subtraction from the data.
Session Keyword 2.0 Theory, Modelling and Inversion
File upload 2.0_constraining_the_1-d_elec_rigaud.pdf
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