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- S21E-0232: Exploring the Sensitivity of Earthquake Dynamic Rupture to Fault Geometry Using Mesh Morphing and Reduced-Order Models
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Board 0232‚ Hall EFG (Poster Hall)NOLA CC
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Gabrielle Hobson, Scripps Institution of Oceanography, University of California San Diego (First Author, Presenting Author)
Dave May, Scripps Institution of Oceanography, University of California San Diego
Alice-Agnes Gabriel, University of California San Diego
The shape, or geometry, of faults below Earth’s surface affects how earthquakes rupture, but their geometry is often uncertain. Computer models of earthquakes rely on meshes to represent faults, subdividing 3D space into a collection of small volumes. Since computer models are expensive to calculate and creating new meshes is labor-intensive, it is challenging to measure the effect of different geometries on earthquake rupture. We present an approach called mesh morphing, which takes a mesh representing one geometry and deforms it to represent a new geometry. This approach rapidly generates many geometrically-varying meshes and allows model output to be used to build reduced-order models, which are useful for measuring how fault geometry influences modeled earthquake dynamics.In this work, we demonstrate mesh morphing for 3D earthquake dynamic rupture simulations where the angle between fault and surface varies. We show that morphed meshes are of high quality and that simulations run using morphed meshes give accurate results. We also use reduced-order models to measure how changing the fault dip angle affects surface displacement and velocities from a modeled earthquake. Our results demonstrate that mesh morphing allows us to accurately and efficiently measure the effects of varying geometry.
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