The Geometry and Growth of Normal Faults
Myths about normal faulting
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Published:January 01, 2017
Abstract:
Analyses of normal faults in mechanically layered strata reveal that material properties of rock layers strongly influence fault nucleation points, fault extent (trace length), failure mode (shear v. hybrid), fault geometry (e.g. refraction through mechanical layers), displacement gradient (and potential for fault tip folding), displacement partitioning (e.g. synthetic dip, synthetic faulting, fault core displacement), fault core and damage zone width, and fault zone deformation processes. These detailed investigations are progressively dispelling some common myths about normal faulting held by industry geologists, for example: (i) that faults tend to be linear in dip profile; (ii) that imbricate normal faults initiate due to sliding on low-angle detachments; (iii) that friction causes fault-related folds (so-called normal drag); (iv) that self-similar fault zone widening is a direct function of fault displacement; and (v) that faults are not dilational features and/or important sources of permeability.
- Balcones fault zone
- Bare Mountain
- Bexar County Texas
- California
- Comal County Texas
- deformation
- detachment faults
- dilation
- dip
- displacements
- drag folds
- Europe
- failures
- fault scarps
- fault zones
- faults
- field studies
- folds
- friction
- geometry
- geophysical profiles
- Iceland
- imbricate tectonics
- Inyo County California
- laboratory studies
- mechanical properties
- mechanics
- Nevada
- normal faults
- Nye County Nevada
- orientation
- Owens Valley
- permeability
- refraction
- San Antonio Texas
- sedimentary rocks
- segmentation
- seismic profiles
- stratigraphic units
- stratigraphy
- structural analysis
- systems
- tectonics
- Texas
- thickness
- United States
- vertical movements
- Western Europe
- Lake Thingvallavatn
- Hidden Valley fault zone
- Canyon Lake Gorge
- Almannagja fault zone
- Southern Fish Slough fault system
- Gold Ace Mine fault zone