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| Titel |
Constraints on fault dynamic weakening mechanisms from natural slip surfaces in carbonate faults |
| VerfasserIn |
N. De Paola, F. Agosta, F. Balsamo, R. Bullock, E. Dempsey, I. Faoro, R. E. Holdsworth, F. Storti |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250070833
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| Zusammenfassung |
| Recent theoretical and experimental studies have proposed that fault lubrication (sliding friction coefficient f < 0.2) during earthquake propagation is due to thermally activated, dynamic weakening mechanisms (e.g. flash heating, thermal pressurization and nanopowder lubrication). Field-based observations from seismically active fault zones, combined with microstructural analysis of selected fault rock samples, may provide valuable constraints on the critical parameters controlling dynamic weakening of seismic faults (e.g. slip zone thickness, roughness, porosity/permeability and grain size and shape distributions).
We studied 11 fault segments of three well-exposed, active extensional fault systems in the central-northern Apennines of Italy: the Umbria, L’Aquila and Fucino Basin Fault systems. All the studied fault segments are located along a NW-SE oriented seismic belt which, in the last two centuries, has hosted moderate/large earthquakes (5
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