Damage and rheology in a fibre-bundle model

Details Damage and rheology in a fibre-bundle model Damage and rheology in a fibre-bundle model

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005geoji.162..859n&link_type=abstract

Geophysical Journal International, Volume 162, Issue 3, pp. 859-866.

Physics

10

Scientific paper

In this paper, we consider the continuum deformation of the brittle upper continental lithosphere, utilizing the fibre-bundle model. Fibre failure is assumed to be a thermally activated process. We further assume that a failed fibre is replaced by a new unstressed fibre. This replacement is analogous to a migration of a dislocation, an earthquake rupture or a microcrack. We derive a non-Newtonian power-law viscous rheology. This is the rheology that has been used to explain the lithospheric deformation in Tibet. We also constrain the parameters in our model using aftershocks. A major advantage of our upper continental rheology is that it has a strong temperature dependence. We then use this model to define the strength envelope of the continental lithosphere. Our results suggest that a damage model is appropriate for the continuum rheology of the upper continental lithosphere.

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