EGU21-6046
https://doi.org/10.5194/egusphere-egu21-6046
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Classifying large strains from digital imagery: application to analogue models of lithosphere deformation

Taco Broerse1, Nemanja Krstekanic1,2, Cor Kasbergen3, and Ernst Willingshofer1
Taco Broerse et al.
  • 1Utrecht University, Faculty of Geosciences, Department of Earth Sciences, Utrecht, Netherlands (d.b.t.broerse@uu.nl)
  • 2Department of Regional Geology, Faculty of Mining and Geology, University of Belgrade, Belgrade, Serbia
  • 3Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands

We are interested in reconstructing the time evolution of 2D plane deformation of analogue models of tectonic processes. Under relevant forcings, these models develop internal deformation, such as faults, and broader zones of deformation. We use Particle Image Velocimetry (PIV) to derive incremental displacements from top-view images that we use in subsequent steps to calculate the shape changes that come with large deformation. Because PIV describes displacement in a spatial reference, and material moves through the area in view, displacements at any given time refer to fixed locations in space, and not to specific material points. By reconstructing the path of material, we can follow small regions of material while they translate, rotate and change shape.


To aid the qualitative interpretation of this deformation, we have developed a novel method that can qualitatively describe shape changes coming from extensional, shortening and horizontal shearing (strike-slip) deformation or combinations of these. This method is based on a logarithmic measure of stretch and results agree well with the visual interpretation of structures that we observe in our models. Thus, we provide tools with which the evolution of 2D tectonic deformation can be interpreted in a physically meaningful manner, but our method may be useful outside the realm of tectonics. Our software to compute deformation is freely available and can be used to post-process incremental displacements from PIV or similar autocorrelation methods.

How to cite: Broerse, T., Krstekanic, N., Kasbergen, C., and Willingshofer, E.: Classifying large strains from digital imagery: application to analogue models of lithosphere deformation, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-6046, https://doi.org/10.5194/egusphere-egu21-6046, 2021.

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