TY - JOUR
T1 - Sub-Patch Roughness in Earthquake Rupture Investigations
AU - Zielke, Olaf
AU - Mai, Paul Martin
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: 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.
PY - 2016/3/4
Y1 - 2016/3/4
N2 - Fault geometric complexities exhibit fractal characteristics over a wide range of spatial scales (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.
AB - Fault geometric complexities exhibit fractal characteristics over a wide range of spatial scales (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.
UR - http://hdl.handle.net/10754/596861
UR - http://doi.wiley.com/10.1002/2015GL067084
UR - http://www.scopus.com/inward/record.url?scp=84959568445&partnerID=8YFLogxK
U2 - 10.1002/2015GL067084
DO - 10.1002/2015GL067084
M3 - Article
VL - 43
SP - 1893
EP - 1900
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 5
ER -