Effects of layering and anistropy on fault geometry

Article Abstract:

Field data analysis of small-scale fault systems reveal the strong effect of anistropy on fault orientation. Conjugate fault development about the maximum compressive stress with 50-degree dihedral angles is evident for isotropic rocks under triaxial compression. Layer orientation with respect to the stress field determines fault geometries in layered rocks. Interbedded layers with distinct mechanical behaviors however, result in orthogonal and oblique fault initiation to more brittle layers and less brittle layers, respectively. Rock deformation experiments confirm such observations.

Rock deformation, Rock mechanics

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The history of the Walls Boundary fault, Shetland: the northward continuation of the Great Glen fault from Scotland

Article Abstract:

Geophysical and geological evidence on Walls boundary fault history is reviewed in detail. The analysis indicates that the fault extends from Fair Isle northeast through and beyond Shetland. A 65-km dextral offset occured on agouge-filled fracture during the Jurassic, post-dating a 100-km net sinistral displacement. The latter event also involved a Carboniferous offset of unknown sense and distance, that produced mylonite.

Natural history, Shetland, Geological mapping

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Discussion on a model for the structure and development of fault zones

Article Abstract:

Childs, et al. have contributed significant viewpoints to the theory of fault modeling although some of their conclusions do not exactly coincide with empirical research on the subject. Nonetheless, their model can be useful for the examination of lateral linkage of hydrocarbon deposits and even for vertical linkages with source rock. Similar models can be derived that strengthen Childs et al.'s observations.

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