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    Visualizing a Spherical Geological Discrete Element Model of Fault Evolution

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    Date
    2012
    Author
    Longshaw, Stephen M.
    Turner, Martin J. ORCID
    Finch, Emma
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    Abstract
    Discrete Element Modelling (DEM) is a numerical technique that uses a system of interacting discrete bodies to simulate the movement of material being exposed to external forces. This technique is often used to simulate granular systems; however by adding further elements that inter-connect the bodies, it can be used to simulate the deformation of a large volume of material. This method has precedent for use in the Earth Sciences and recently, with the increase of available computing power, it has been put to good use simulating the evolution of extensional faults in large scale crustal experiments that involve over half a million individual spherical bodies. An interactive environment that provides high quality rendering is presented, showing that interactivity is key in allowing the intelligent application of visualization methods such as colour-mapping and visibility thresholds in order to extract fault information from a geological DEM. It is also shown that glyph representation alone is not sufficient to provide full insight into the complex three dimensional geometries of the faults found within the model. To overcome this, a novel use of the MetaBall method is described, which results in implicit surface representations of sphere sub-sets. The surfaces produced are shown to provide greater insight into the faults found within the data but also raise questions as to their meaning.
    BibTeX
    @inproceedings {10.2312:LocalChapterEvents:TPCG:TPCG12:077-084,
    booktitle = {Theory and Practice of Computer Graphics},
    editor = {Hamish Carr and Silvester Czanner},
    title = {{Visualizing a Spherical Geological Discrete Element Model of Fault Evolution}},
    author = {Longshaw, Stephen M. and Turner, Martin J. and Finch, Emma},
    year = {2012},
    publisher = {The Eurographics Association},
    ISBN = {978-3-905673-93-7},
    DOI = {10.2312/LocalChapterEvents/TPCG/TPCG12/077-084}
    }
    URI
    http://dx.doi.org/10.2312/LocalChapterEvents/TPCG/TPCG12/077-084
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