The GeoMod2008 Analogue and Numerical thrust wedge model comparisons
The GeoMod2004 experiments
showed that to first order numerical and analogue models obtain a similar evolution
with localisation of deformation onto shear zones, and that different numerical techniques
(FEM, FDM and DEM) are capable of reproducing structures observed in the analogue sandbox experiments.
But the experiments also pointed to variability among models in number of shear zones, their dip angle
and spacing, and in the evolution of surface slope for thrust wedges.
This formed our motivation to organise new comparison experiments, with the aim to try to understand
these differences in a quantitative manner.
The GeoMod2008 experiments focussed on brittle thrust wedges, because critical taper theory provides an
analytical background for these setups and many previous studies investigated brittle thrust
wedge behaviour with analogue and numerical models.
We examined three brittle thrust wedge setups:
- a stable wedge test
- an unstable wedge test that examines the evolution of a wedge by thrust formation
from a subcritical state to the critical taper geometry
- stacking of forward thrusts that are translated upward along a backward thrust
The results have been published as two papers in the Journal of Structural Geology:
Buiter, S.J.H., G. Schreurs, M. Albertz, T.V. Gerya, B. Kaus,
W. Landry, L. Le Pourhiet, Y. Mishin, D.L. Egholm, M. Cooke, B. Maillot,
C. Thieulot, T. Crook, D. May, P. Souloumiac, and C. Beaumont, 2016.
Benchmarking numerical models of brittle thrust wedges,
Journal of Structural Geology 92, 140-177,
Schreurs, G., S.J.H. Buiter, J. Boutelier, C. Burberry, J.-P.
Callot, C. Cavozzi, M. Cerca, J.-H. Chen, E. Cristallini,
A.R. Cruden, L. Cruz, J.-M. Daniel, G. Da Poian, V.H. Garcia, C.J.S. Gomes,
C. Grall, Y. Guillot, C. Guzmán, T. Nur Hidayah, G. Hilley, M. Klinkmueller,
H.A. Koyi, C.-Yu Lu, B. Maillot, C. Meriaux, F.Nilfouroushan, C.-C. Pan,
D. Pillot, R. Portillo, M. Rosenau, W.P. Schellart, R.W. Schlische,
A. Take, B. Vendeville, M. Vergnaud, M. Vettori, S.-H. Wang, M.O. Withjack,
D. Yagupsky, and Y. Yamada, 2016.
Benchmarking analogue models of brittle thrust wedges,
Journal of Structural Geology 92, 116-139,
The original description (of December 2008) of the setup and modelling procedure for the
experiments can be
© Susanne Buiter and Guido Schreurs