Fault-zone healing effectiveness and the structural evolution of strike-slip fault systems

Finzi, Yaron, Hearn, Elizabeth H., Lyakhovsky, Vladimir and Gross, Lutz (2011) Fault-zone healing effectiveness and the structural evolution of strike-slip fault systems. Geophysical Journal International, 186 3: 963-970. doi:10.1111/j.1365-246X.2011.05099.x

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Author Finzi, Yaron
Hearn, Elizabeth H.
Lyakhovsky, Vladimir
Gross, Lutz
Title Fault-zone healing effectiveness and the structural evolution of strike-slip fault systems
Journal name Geophysical Journal International   Check publisher's open access policy
ISSN 0956-540X
1365-246X
Publication date 2011-09-01
Sub-type Article (original research)
DOI 10.1111/j.1365-246X.2011.05099.x
Open Access Status File (Publisher version)
Volume 186
Issue 3
Start page 963
End page 970
Total pages 8
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2012
Language eng
Formatted abstract
Numerical simulations of long-term crustal deformation reveal the important role that damage healing (i.e. fault-zone strengthening) plays in the structural evolution of strike-slip fault systems. We explore the sensitivity of simulated fault zone structure and evolution patterns to reasonable variations in the healing-rate parameters in a continuum damage rheology model. Healing effectiveness, defined herein as a function of the healing rate parameters, describes the post-seismic healing process in terms of the characteristic inter-seismic damage level expected along fault segments in our simulations. Healing effectiveness is shown to control the spatial extent of damage zones and the long-term geometrical complexity of strike-slip fault systems in our 3-D simulations. Specifically, simulations with highly effective healing form interseismically shallow fault cores bracketed by wide zones of off-fault damage. Ineffective healing yields deeper fault cores that persist throughout the interseismic interval, and narrower zones of off-fault damage. Furthermore, highly effective healing leads to a rapid evolution of an initially segmented fault system to a simpler through-going fault, while ineffective healing along a segmented fault preserves complexities such as stepovers and fault jogs. Healing effectiveness and its role in fault evolution in our model may be generalized to describe how heat, fluid-flow and stress conditions (that contribute to fault-zone healing) affect fault-zone structure and fault system evolution patterns.
Keyword Elasticity and anelasticity
Fault zone rheology
Dynamics and mechanics of faulting
Fractures and faults
Crustal structure
North Anatolian Fault
Strong ground motion
San-Andreas Fault
Karadere-Duzce Branch
Damage rheology
Recurrence interval
Dependent friction
Earthquake cycle
Temporal-changes
Fluid-flow
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2012 Collection
Earth Systems Science Computational Centre Publications
 
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Created: Sun, 04 Sep 2011, 11:09:12 EST by System User on behalf of Earth Systems Science Computational Centre