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Deformation of Turkey and motion of the North Anatolian Fault
Overview. This is a 3D mechanical experiment showing how Turkey is
deforming under pushing of Arabian plate and pulling at the Hellenic trench (see
map).
Model parameters are defined in files iessai
and jessai . An elastoplastic model (Drucker-Prager plasticity) and a viscoelastic model
(Maxwell model) are used to model respectively the frictionnal crust and the
ductile crust. Fault motion of the NAF is
accounted by frictional contact. Model boundary conditions are 1) lateral velocities imposed around the model
following the GPS results of Mc Clusky et al, J. Geoph. Res., 2000 (figure) ; 2) hydrostatic pressure at the base of the crust. A smoothed topography is used for the free
surface (file topom), and a local isostatic compensation is assumed for the Moho.
Initial temperature distribution is setup in the file
tempi.
Results. After about 150000 yrs, the mesh (figure) is
weakly deformed as most of the displacements occured on the frictional
interface. However, a largely strained zone occurs near the south-western fault
termination (figure), corresponding to the location of the Corinth gulf. A
reasonably good agreement is made with the GPS data of Mc Clusky (figure), with
the notable exception of western Turkey.
Related publication. A set of numerical experiments
similar to this one has been published by Provost et al.,2003 (pdf)
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