Intégration des données d'observatoires magnétiques dans l'interprétation de sondages magnétotelluriques : acqusition, traitement, interprétation

Abstract : In this manuscript, we detail the application of continuous wavelet transform to processing schemes for the detection and the characterisation of geomagnetic and atmospheric sources. Presented techniques are based on time-frequency properties of electromagnetic (EM) waves observed in magnetotellurics (MT) time series. We detail the application of these detection procedures in a MT processing scheme. To recover MT response functions, we use robust statistics and a hierarchical bootstrap approach for uncertainties determination. Interpretation of two datasets are also presented. The first MT study deals with the caracterisation of the resistivity distribution below the French National magnetic observatory of Chambon-la-Forêt. The second study details the interpretation of new MT soundings acquired in March 2016 in the Trisuli valley, Nepal. The main objective of this campaign was to compare the new soundings with an old campaign in 1996. We discuss topography effects on MT soundings and their implication on the resistivity distribution. We also introduce a new interpretation of the resistivity distribution in Trisuli valley.
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Submitted on : Wednesday, August 21, 2019 - 11:05:13 AM
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Hugo Larnier. Intégration des données d'observatoires magnétiques dans l'interprétation de sondages magnétotelluriques : acqusition, traitement, interprétation. Géophysique [physics.geo-ph]. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAH003⟩. ⟨tel-02268559⟩

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