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dc.contributor.authorZielke, Olaf
dc.contributor.authorGalis, Martin
dc.contributor.authorMai, Paul Martin
dc.date.accessioned2017-05-31T10:09:30Z
dc.date.available2017-05-31T10:09:30Z
dc.date.issued2017-01-26
dc.identifier.citationZielke O, Galis M, Mai PM (2017) Fault roughness and strength heterogeneity control earthquake size and stress drop. Geophysical Research Letters 44: 777–783. Available: http://dx.doi.org/10.1002/2016gl071700.
dc.identifier.issn0094-8276
dc.identifier.doi10.1002/2016gl071700
dc.identifier.urihttp://hdl.handle.net/10754/623763
dc.description.abstractAn earthquake's stress drop is related to the frictional breakdown during sliding and constitutes a fundamental quantity of the rupture process. High-speed laboratory friction experiments that emulate the rupture process imply stress drop values that greatly exceed those commonly reported for natural earthquakes. We hypothesize that this stress drop discrepancy is due to fault-surface roughness and strength heterogeneity: an earthquake's moment release and its recurrence probability depend not only on stress drop and rupture dimension but also on the geometric roughness of the ruptured fault and the location of failing strength asperities along it. Using large-scale numerical simulations for earthquake ruptures under varying roughness and strength conditions, we verify our hypothesis, showing that smoother faults may generate larger earthquakes than rougher faults under identical tectonic loading conditions. We further discuss the potential impact of fault roughness on earthquake recurrence probability. This finding provides important information, also for seismic hazard analysis.
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). Numerical simulations for this study were carried out on the SHAHEEN II supercomputer at KAUST. Figures in the main manuscript and the online supporting information provide all the data used in this investigation. Raw data (of on-fault slip distributions) and computer codes used in this study are available from the corresponding author upon reasonable request. No financial or other types of conflicts of interest exist for the authors regarding this manuscript. We want to thank the Editor and reviewers for their construction criticism and helpful comments that improved this study.
dc.publisherAmerican Geophysical Union (AGU)
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/2016GL071700/full
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commerc ial and no modifications or adaptations are made.
dc.subjectstress drop
dc.subjectfault strength
dc.subjectheterogeneity
dc.subjectearthquake size
dc.subjectearthquake recurrence
dc.titleFault roughness and strength heterogeneity control earthquake size and stress drop
dc.typeArticle
dc.contributor.departmentComputational Earthquake Seismology (CES) Research Group
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalGeophysical Research Letters
dc.eprint.versionPublisher's Version/PDF
kaust.personZielke, Olaf
kaust.personGalis, Martin
kaust.personMai, Paul Martin
refterms.dateFOA2018-06-14T05:11:26Z
dc.date.published-online2017-01-26
dc.date.published-print2017-01-28


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