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| Titel |
Mechanical basis for slip along low-angle normal faults |
| VerfasserIn |
Emmanuel Lecomte, Laetitia Le Pourhiet, Olivier Lacombe |
| 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 |
250079557
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| Zusammenfassung |
| The existence of active low-angle normal faults is much debated because (1) shallow dipping
normal faults do not produce large earthquakes (M>5.5) and (2) the classical theory of fault
mechanics implies that faults are locked for a dip lower than 30Ë . However, field
observations suggest that brittle deformation occurs on low-angle normal faults at very
shallow dip. Field evidences and theory can be reconciled using an alternative mechanical
model of fault reactivation including a thick elasto-plastic frictional fault gouge. This model
allows the dilation angle Ï in the fault gouge to be lower than the friction angle Ï, contrary
to the classical model which implies that the two angles are equals. Within this
formulation, it is possible to consider that the fault may keep a constant thickness
(incompressibility, Ï=0), thicken (dilation, Ï >0) or thin (compaction, Ï |
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