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| Titel |
Constitutive models of faults in the viscoelastic lithosphere |
| VerfasserIn |
Louis Moresi, Hans Mühlhaus, John Mansour, Meghan Miller |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250076309
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| Zusammenfassung |
| Moresi and Muhlhaus (2006) presented an algorithm for describing shear band formation and evolution
as a coallescence of small, planar, fricition-failure surfaces. This algorithm assumed that
sliding initially occurs at the angle to the maximum compressive stress dictated by Anderson faulting
theory and demonstrated that shear bands form with the same angle as the microscopic angle of initial failure.
Here we utilize the same microscopic model to generate frictional slip on prescribed surfaces which
represent faults of arbitrary geometry in the viscoelastic lithosphere. The faults are actually represented
by anisotropic weak zones of finite width, but they are instantiated from a 2D manifold represented by a cloud of points with associated normals and mechanical/history properties. Within the hybrid particle / finite-element code, Underworld, this approach gives a very flexible mechanism for describing complex
3D geometrical patterns of faults with no need to mirror this complexity in the thermal/mechanical solver.
We explore a number of examples to demonstrate the strengths and weaknesses of this particular approach including a 3D model of the deformation of Southern California which accounts for the major fault systems.
L. Moresi and H.-B. Mühlhaus, Anisotropic viscous models of large-deformation Mohr-Coulomb failure. Philosophical Magazine, 86:3287–3305, 2006. |
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