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Titre2D inversion of 3D magnetotelluric data: the Kayabe dataset
AuteurGarcia, X; Ledo, J; Queralt, P
SourceElectromagnetic induction in the Earth; Earth, Planets and Space vol. 51, no. 10, 1999 p. 1135-1143, (Accès ouvert)
LiensAbstract - Résumé
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 1999048
ÉditeurSpringer Nature
Réunion14th workshop on electromagnetic induction in the Earth; Sinaia; RO; août 16-22, 1998
Documentpublication en série
Mediapapier; en ligne; numérique
Sujetscollectes des données; méthodes de collecte de données de terrain; systèmes de gestion d'une base de données; champ magnétotellurique; interprétations magnétotelluriques; levés magnétotelluriques; résistivité magnétométrique; établissement de modèles; modélisation numérique de terrain; ressources géothermiques; géophysique; géomathématique
Illustrationslocation maps; graphs
Diffusé2014 06 20
Résumé(disponible en anglais seulement)
In the last two Magnetotelluric Data Interpretation Workshops (MT-DIW) the participants were asked to model the Kayabe magnetotelluric dataset, a dense (100 m) grid of thirteen lines, with thirteen stations in each line. Bahr's phase-sensitive skew and the Groom and Bailey decomposition were used to select those lines for which the data could be considered two-dimensional. For these lines we used a 2D inversion algorithm to obtain a series of resistivity models for the earth. Finally, we constructed a 3D model using the 2D models and critically examined the validity and practicality of this approach based on 3D model study. We found that in the Kayabe dataset case the common practice of using 2D models to depict 3D models, can only be used to create a starting model for 3D interpretation. The sequential 2D models as a representation of a 3D body is unacceptable in terms of fit to the observed data. We question the validity of some of the conductivity structures in the 2D models, as they can be mere artifacts created by the algorithm to match 3D effects.