Analysis of slip-weakening frictional laws with static restrengthening and their implications on the scaling, asymmetry, and mode of dynamic rupture on homogeneous and biomaterial interfaces

Olsen-Kettle, L. M., Weatherley, D., Saez, E., Gross, L., Muhlhaus, H. B. and Xing, H. L. (2008) Analysis of slip-weakening frictional laws with static restrengthening and their implications on the scaling, asymmetry, and mode of dynamic rupture on homogeneous and biomaterial interfaces. Journal of Geophysical Research: Solid Earth, 113 B8: B08307.1-B08307.18.


Author Olsen-Kettle, L. M.
Weatherley, D.
Saez, E.
Gross, L.
Muhlhaus, H. B.
Xing, H. L.
Title Analysis of slip-weakening frictional laws with static restrengthening and their implications on the scaling, asymmetry, and mode of dynamic rupture on homogeneous and biomaterial interfaces
Journal name Journal of Geophysical Research: Solid Earth   Check publisher's open access policy
ISSN 0148-0227
2156-2202
Publication date 2008-08-05
Year available 2008
Sub-type Article (original research)
DOI 10.1029/2007JB005454
Volume 113
Issue B8
Start page B08307.1
End page B08307.18
Total pages 18
Place of publication United States
Publisher American Geophysical Union
Collection year 2009
Language eng
Subject 040403 Geophysical Fluid Dynamics
010110 Partial Differential Equations
970104 Expanding Knowledge in the Earth Sciences
Abstract Dynamic simulations of homogeneous, heterogeneous and bimaterial fault rupture using modified slip-weakening frictional laws with static restrengthening are presented giving rise to both crack-like and pulse-like rupture. We demonstrate that pulse-like rupture is possible by making a modification of classical slip-weakening friction to include static restrengthening. We employ various slip-weakening frictional laws to examine their effect on the resulting earthquake rupture speed, size and mode. More complex rupture characteristics were produced with more strongly slip-weakening frictional laws, and the degree of lip-weakening had to be finely tuned to reproduce realistic earthquake rupture characteristics. Rupture propagation on a fault is controlled by the constitutive properties of the fault. We provide benchmark tests of our method against other reported solutions in the literature. We demonstrate the applicability of our elastoplastic fault model for modeling dynamic rupture and wave propagation in fault systems, and the rich array of dynamic properties produced by our elastoplastic finite element fault model. These are governed by a number of model parameters including: the spatial heterogeneity and material contrast across the fault, the fault strength, and not least of all the frictional law employed. Asymmetric bilateral fault rupture was produced for the bimaterial case, where the degree of material contrast influenced the rupture speed in the different propagation directions.
Keyword Dynamic rupture
Bimaterial interface
Slip-weakening friction
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article # B08307

 
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Created: Wed, 08 Apr 2009, 20:12:28 EST by Tracy Paroz on behalf of Earth Systems Science Computational Centre