earthquakes_2021.gif (45.36 MB)
Download file

Shear zones (high-resolution movie)

Download (45.36 MB)
posted on 16.06.2021, 10:26 by Emma FinchEmma Finch
Development of a shear zone in a Discrete Element Model. To permit localisation onto a central plane, an initial damage zone is generated by breaking bonds between a percentage of the elements, this is demonstrated by elements that are coloured grey. To initiate shear, the top wall is incremented to the right and the bottom wall toward the left. This figure focusses on central third (vertically) of the model. Boundary conditions in the x-orientation are wrapped so elements that exit on one side of the model appear on the opposite side.

Elements are coloured when a further bond to a neighbour is broken. The colourbar ranges from yellow (1) to black (5+). Some elements remain grey because all the bonds to their neighbours were broken when the shear zone was initiated. These elements are passively transported within the shear zone. The experiment runs for 80,000 time steps.

Elements from this model can be defined as receivers and their accelerations plotted as proxies for seismic events within the shear zone(see