Joint probabilistic inversion of DC resistivity and seismic refraction data applied to bedrock/regolith interface delineation

Détails

ID Serval
serval:BIB_8B59C1D6BD61
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Joint probabilistic inversion of DC resistivity and seismic refraction data applied to bedrock/regolith interface delineation
Périodique
Journal of Applied Geophysics
Auteur(s)
de Pasquale Giulia, Greenwood Andrew, Linde Niklas
ISSN
0926-9851
Statut éditorial
In Press
Langue
anglais
Résumé
The depth and geometry of the bedrock/regolith interface influence many near-surface processes. Geophysics offer means to image them non-invasively since they correspond to discontinuities in physical properties. For instance, refraction seismic applications can leverage the strong correlation between seismic velocity and porosity, while DC resistivity measurements with their sensitivity to electrical conductivity are indirectly sensitive to porosity and clay content. Combining these two data types is beneficial since their spatial resolution patterns and sensitivities to relevant target properties differ. Here, we propose a probabilistic joint inversion framework that uses DC resistivity and first-arrival seismic travel times to infer a common interface geometry separating two heterogeneous sub-domains. A synthetic test case demonstrates that the method is more accurate in sampling the target interface than inversion results obtained using single datasets. We then applied the joint inversion method to field data from the Calhoun Critical Zone Observatory in South Carolina, where it resolves apparent contradictions in the individual inversion results. It produces a bedrock topography that mirrors surface topography and offers clear indications of a more fractured bedrock below the surface topography lows.
Financement(s)
Fonds national suisse / Projets / 200021-155924
Création de la notice
30/08/2019 15:11
Dernière modification de la notice
31/08/2019 5:08
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