Scaling of fault damage zones with displacement and the implications for fault growth processes

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dc.contributor.authorFaulkner, D. R.
dc.contributor.authorMitchell, T. M.
dc.contributor.authorJensen, E.
dc.contributor.authorCembrano, J.
dc.date.accessioned2024-01-10T14:21:36Z
dc.date.available2024-01-10T14:21:36Z
dc.date.issued2011
dc.description.abstractKnowledge of the spatial extent of damage surrounding fault zones is important for understanding crustal fluid flow and also for understanding the physical processes and mechanics by which fault zones develop with slip. There are few data available on the scaling of the fault damage zone with fault displacement, and of those that exist, deriving scaling relationships is hampered by comparing faults that run through different lithologies, have formed at different crustal depths or tectonic regimes (e. g., normal versus strike-slip movement). We describe new data on the microfracture damage zone width from small displacement fault zones within the Atacama fault zone in northern Chile that formed at similar to 6 km depth within a dioritic protolith. The microfracture damage zone is shown by an alteration halo surrounding the faults in which the density of the microfractures is much greater than background levels in the undeformed protolith. The data show that damage zone width increases with fault displacement and there appears to be a zero intercept to this relationship, meaning that at zero displacement, there is no microfracture damage zone. This is supported by field observations at fault tips that show a tapering out of fault damage zones. These data, combined with data from the literature, indicate that this same relationship might hold for much larger displacement faults. There is also a distinct asymmetry to the fracture damage. Several processes for the development of the observed scaling are discussed. The widely accepted theory of a process zone predicts that fault damage zone width increases with fault length and thus should always be largest at a propagating fault tip where displacement is lowest. This prediction is opposite to that seen in the current data set, leading to suggestion that other processes, such as damage zone growth with increasing displacement due to geometric irregularities or coseismic damage formation might better explain the spatial extent of damage surrounding even low-displacement faults.
dc.description.funderRoyal Society
dc.description.funderFondecyt
dc.description.funderNatural Environment Research Council
dc.fechaingreso.objetodigital2024-05-02
dc.format.extent11 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1029/2010JB007788
dc.identifier.eissn2169-9356
dc.identifier.issn2169-9313
dc.identifier.urihttps://doi.org/10.1029/2010JB007788
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79723
dc.identifier.wosidWOS:000291107400001
dc.information.autorucIngeniería;Cembrano J ;S/I;1008585
dc.language.isoen
dc.nota.accesocontenido parcial
dc.publisherAMER GEOPHYSICAL UNION
dc.revistaJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
dc.rightsacceso restringido
dc.subjectPUNCHBOWL FAULT
dc.subjectSLIP
dc.subjectSYSTEM
dc.subjectDEFORMATION
dc.subjectMECHANICS
dc.subjectEVOLUTION
dc.subjectLENGTH
dc.subjectROCK
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleScaling of fault damage zones with displacement and the implications for fault growth processes
dc.typeartículo
dc.volumen116
sipa.codpersvinculados1008585
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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