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    Sub-Patch Roughness in Earthquake Rupture Investigations

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    Type
    Article
    Authors
    Zielke, Olaf cc
    Mai, Paul Martin cc
    KAUST Department
    Computational Earthquake Seismology (CES) Research Group
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-03-04
    Online Publication Date
    2016-03-04
    Print Publication Date
    2016-03-16
    Permanent link to this record
    http://hdl.handle.net/10754/596861
    
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    Abstract
    Fault geometric complexities exhibit fractal characteristics over a wide range of spatial scales (<µm to >km) and strongly affect the rupture process at corresponding scales. Numerical rupture simulations provide a framework to quantitatively investigate the relationship between a fault's roughness and its seismic characteristics. Fault discretization however introduces an artificial lower limit to roughness. Individual fault patches are planar and sub-patch roughness –roughness at spatial scales below fault-patch size– is not incorporated. Does negligence of sub-patch roughness measurably affect the outcome of earthquake rupture simulations? We approach this question with a numerical parameter space investigation and demonstrate that sub-patch roughness significantly modifies the slip-strain relationship –a fundamental aspect of dislocation theory. Faults with sub-patch roughness induce less strain than their planar-fault equivalents at distances beyond the length of a slipping fault. We further provide regression functions that characterize the stochastic effect sub-patch roughness.
    Citation
    Sub-Patch Roughness in Earthquake Rupture Investigations 2016:n/a Geophysical Research Letters
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). No financial or other types of conflicts of interest exist for the authors regarding this manuscript. Figures in the main manuscript and supporting online material provide all data used in this investigation. We want to thank M. Galis for many stimulating discussion. We also want to thank the reviewers for their constructive criticism and helpful comments that improved this study.
    Publisher
    American Geophysical Union (AGU)
    Journal
    Geophysical Research Letters
    DOI
    10.1002/2015GL067084
    Additional Links
    http://doi.wiley.com/10.1002/2015GL067084
    ae974a485f413a2113503eed53cd6c53
    10.1002/2015GL067084
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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