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@ARTICLE{Aldam:845022,
author = {Aldam, Michael and Weikamp, Marc and Spatschek, Robert and
Brener, Efim A. and Bouchbinder, Eran},
title = {{C}ritical {N}ucleation {L}ength for {A}ccelerating
{F}rictional {S}lip},
journal = {Geophysical research letters},
volume = {44},
number = {22},
issn = {0094-8276},
address = {Hoboken, NJ},
publisher = {Wiley},
reportid = {FZJ-2018-02351},
pages = {11,390 - 11,398},
year = {2017},
abstract = {The spontaneous nucleation of accelerating slip along
slowly driven frictional interfaces is central to a broad
range of geophysical, physical, and engineering systems,
with particularly far‐reaching implications for earthquake
physics. A common approach to this problem associates
nucleation with an instability of an expanding creep patch
upon surpassing a critical length Lc. The critical
nucleation length Lc is conventionally obtained from a
spring‐block linear stability analysis extended to
interfaces separating elastically deformable bodies using
model‐dependent fracture mechanics estimates. We propose
an alternative approach in which the critical nucleation
length is obtained from a related linear stability analysis
of homogeneous sliding along interfaces separating
elastically deformable bodies. For elastically identical
half‐spaces and rate‐and‐state friction, the two
approaches are shown to yield Lc that features the same
scaling structure, but with substantially different
numerical prefactors, resulting in a significantly larger Lc
in our approach. The proposed approach is also shown to be
naturally applicable to finite‐size systems and bimaterial
interfaces, for which various analytic results are derived.
To quantitatively test the proposed approach, we performed
inertial Finite‐Element‐Method calculations for a
finite‐size two‐dimensional elastically deformable body
in rate‐and‐state frictional contact with a rigid body
under sideway loading. We show that the theoretically
predicted Lc and its finite‐size dependence are in
reasonably good quantitative agreement with the full
numerical solutions, lending support to the proposed
approach. These results offer a theoretical framework for
predicting rapid slip nucleation along frictional
interfaces.},
cin = {PGI-2 / IEK-2},
ddc = {550},
cid = {I:(DE-Juel1)PGI-2-20110106 / I:(DE-Juel1)IEK-2-20101013},
pnm = {144 - Controlling Collective States (POF3-144)},
pid = {G:(DE-HGF)POF3-144},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000419102300020},
doi = {10.1002/2017GL074939},
url = {https://juser.fz-juelich.de/record/845022},
}