A unified description of localization for application to large-scale tectonics -: art. no. 2045

被引:103
|
作者
Montési, LGJ
Zuber, MT
机构
[1] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
[2] NASA, Goddard Space Flight Ctr, Terr Phys Lab, Greenbelt, MD 20771 USA
关键词
localization; shear zones; rheology; earthquake; dynamics;
D O I
10.1029/2001JB000465
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
[1] Localized regions of deformation such as faults and shear zones are ubiquitous in the Earth's lithosphere. However, we lack a simple unified framework of localization that is independent of the mechanism or scale of localization. We address this issue by introducing the effective stress exponent, ne, a parameter that describes how a material responds to a local perturbation of an internal variable being tested for localization. The value of ne is based on micromechanics. A localizing regime has a negative n(e), indicating a weakening behavior, and localization is stronger for more negative 1/n(e). We present expressions for the effective stress exponent associated with several mechanisms that trigger localization at large scale: brittle failure with loss of cohesion, elastoplasticity, rate- and state-dependent friction, shear heating, and grain-size feedback in ductile rocks. In most cases, localization does not arise solely from the relation between stress and deformation but instead requires a positive feedback between the rheology and internal variables. Brittle mechanisms (failure and friction) are generally described by ne of the order of -100. Shear heating requires an already localized forcing, which could be provided by a brittle fault at shallower levels of the lithosphere. Grain size reduction, combined with a transition from dislocation to diffusion creep, leads to localization only if the grain size departs significantly from its equilibrium value, because either large-scale flow moves rocks through different thermodynamic environments or new grains are nucleated. When shear heating or grain-size feedback produce localization, 1/n(e) can be extremely negative and can control lithospheric-scale localization.
引用
收藏
页数:21
相关论文
共 50 条
  • [41] Large N cosmology -: art. no. 011
    Brandenberger, R
    Ho, PM
    Kao, HC
    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2004, (11): : 159 - 177
  • [42] Reversible destruction of dynamical localization -: art. no. 234101
    Lignier, H
    Chabé, J
    Delande, D
    Garreau, JC
    Szriftgiser, P
    PHYSICAL REVIEW LETTERS, 2005, 95 (23)
  • [43] Supergravity description of the large-N noncommutative dipole field theories -: art. no. 031
    Alishahiha, M
    Yavartanoo, H
    JOURNAL OF HIGH ENERGY PHYSICS, 2002, (04):
  • [44] Localization in splitting of matter waves -: art. no. 033607
    Jääskeläinen, M
    Stenholm, S
    PHYSICAL REVIEW A, 2003, 68 (03):
  • [45] Localization from σ-model geodesics -: art. no. 075412
    Lamacraft, A
    Simons, BD
    Zirnbauer, MR
    PHYSICAL REVIEW B, 2004, 70 (07) : 075412 - 1
  • [46] Dependence of the decay phase of solar energetic electron events on the large-scale IMF structure:: ACE observations -: art. no. 2079
    Sarris, ET
    Malandraki, OE
    GEOPHYSICAL RESEARCH LETTERS, 2003, 30 (21)
  • [47] Mining SAGE data allows large-scale, sensitive screening of antisense transcript expression -: art. no. e163
    Quéré, R
    Manchon, L
    Lejeune, M
    Clément, O
    Pierrat, F
    Bonafoux, B
    Commes, T
    Piquemal, D
    Marti, J
    NUCLEIC ACIDS RESEARCH, 2004, 32 (20) : e163
  • [48] Large-scale exploration of growth inhibition caused by overexpression of genomic fragments in Saccharomyces cerevisiae -: art. no. R72
    Boyer, J
    Badis, G
    Fairhead, C
    Talla, E
    Hantraye, F
    Fabre, E
    Fischer, G
    Hennequin, C
    Koszul, R
    Lafontaine, I
    Ozier-Kalogeropoulos, O
    Ricchetti, M
    Richard, GF
    Thierry, A
    Dujon, B
    GENOME BIOLOGY, 2004, 5 (09)
  • [49] Implementing a dynamical ammonia emission parameterization in the large-scale air pollution model ACDEP -: art. no. D06306
    Skjoth, CA
    Hertel, O
    Gyldenkærne, S
    Ellermann, T
    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2004, 109 (D6)
  • [50] Large scale structure and the generalized Chaplygin gas as dark energy -: art. no. 023004
    Multamäki, T
    Manera, M
    Gaztañaga, E
    PHYSICAL REVIEW D, 2004, 69 (02):