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Cosmic physics"},"provenance":null},{"subject":{"scheme":"keyword","value":"Geology"},"provenance":null},{"subject":{"scheme":"keyword","value":"geodynamics"},"provenance":null},{"subject":{"scheme":"keyword","value":"shear zone"},"provenance":null},{"subject":{"scheme":"keyword","value":"fault meshing"},"provenance":null},{"subject":{"scheme":"keyword","value":"numerical model"},"provenance":null},{"subject":{"scheme":"FOS","value":"01 natural sciences"},"provenance":null},{"subject":{"scheme":"FOS","value":"0105 earth and related environmental sciences"},"provenance":null},{"subject":{"scheme":"keyword","value":"medial axis"},"provenance":null}],"mainTitle":"3D Reconstruction of Complex Fault Systems From Volumetric Geodynamic Shear Zones Using Medial Axis Transform","subTitle":null,"descriptions":["<jats:title>Abstract</jats:title>                   <jats:p>                     Reconstructing fault surfaces from volumetric data is a longstanding challenge in geosciences. We present a novel 3D method based on the medial axis to transform a volumetric strain‐rate invariant field from long‐term geodynamic simulations into fault surfaces. In these geodynamic models, faults correspond to regions of locally high values of the second invariant of the strain‐rate commonly referred to as shear zones. The proposed workflow begins by normalizing the strain‐rate to define fault indicator field . An iso‐surface of a chosen  value is then extracted to form an envelope around the shear zones. Using the shrinking ball algorithm (Ma et al., 2012,                     <jats:ext-link xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"https://doi.org/10.1007/s00371-011-0594-7\">https://doi.org/10.1007/s00371‐011‐0594‐7</jats:ext-link>                     ), we compute the medial axis of this 3D envelope to generate a point cloud representing the geometric skeleton of the shear zones. We reconstruct fault surfaces by applying Delaunay triangulation followed by Laplacian smoothing. For models involving multiple intersecting faults, we perform a local principal component analysis (PCA) of the coordinates defining the medial axis and use the resulting eigenvectors to detect first‐order orientation variations, enabling the separation and individualization of faults. We demonstrate the generality and robustness of the method by applying it several diverse 3D geodynamic scenarios: A single strike‐slip fault, a branching strike‐slip fault in a restraining bend, a dense strike‐slip fault network, a rift system, and a subduction zone with a megathrust and a conjugate thrust fault.                   </jats:p>"],"publicationDate":"2025-06-01","publisher":"American Geophysical Union (AGU)","embargoEndDate":null,"sources":["Crossref","Geochemistry, Geophysics, Geosystems, Vol 26, Iss 6, Pp n/a-n/a (2025)","Geochemistry, Geophysics, Geosystems"],"formats":null,"contributors":null,"coverages":null,"bestAccessRight":{"code":"c_abf2","label":"OPEN","scheme":"http://vocabularies.coar-repositories.org/documentation/access_rights/"},"container":{"name":"Geochemistry, Geophysics, 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