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    Initiation and arrest of earthquake ruptures due to elongated overstressed regions

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    Type
    Article
    Authors
    Galis, Martin
    Ampuero, Jean-Paul
    Mai, Paul Martin cc
    Kristek, Jozef
    KAUST Department
    Computational Earthquake Seismology (CES) Research Group
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    BAS/1/1339-01-01
    Date
    2019-02-17
    Online Publication Date
    2019-02-17
    Print Publication Date
    2019-06-01
    Permanent link to this record
    http://hdl.handle.net/10754/652845
    
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    Abstract
    SUMMARY The initiation of natural and induced earthquakes is promoted in fault areas where shear stress is close to fault strength. In many real-world situations, these overstressed fault areas (or € asperities') are very elongated; for example, in the case of a fault intersecting a reservoir subject to fluid-injection, or the stress concentration along the bottom of a seismogenic zone induced by deep fault creep. Theoretical estimates of the minimum overstressed asperity size leading to runaway rupture and of the final size of self-arrested ruptures are only available for 2-D problems and for 3-D problems with an asperity aspect ratio close to one. In this study, we determine how the nucleation of ruptures on elongated asperities, and their ensuing arrest, depends on the size and aspect ratio of the asperity and on the background stress. Based on a systematic set of 3-D dynamic rupture simulations assuming linear slip-weakening friction, we find that if the shortest asperity side is smaller than the 2-D critical length, the problem effectively reduces to a 2-D problem in which rupture nucleation and arrest are controlled by the shortest length of the asperity. Otherwise, nucleation and rupture arrest are controlled by the asperity area, with a minor exception: for asperities with shortest side slightly larger than the 2-D critical length, arrested ruptures are smaller than predicted by the asperity area. The fact that rupture arrest is dominantly controlled by area, even for elongated asperities, corroborates the finding that observed maximum magnitudes of earthquakes induced by fluid injection are consistent with the theoretical relation between the magnitude of the largest self-arrested rupture and the injected volume. In the con of induced seismicity, our simulations provide plausible scenarios that could be either favourable or challenging for traffic light systems and provide mechanical insights into the conditions leading to these situations.
    Citation
    Galis M, Ampuero J-P, Mai PM, Kristek J (2019) Initiation and arrest of earthquake ruptures due to elongated overstressed regions. Geophysical Journal International 217: 1783–1797. Available: http://dx.doi.org/10.1093/gji/ggz086.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST), grant BAS/1/1339-01-01. MG and JK acknowledge partial support by the Slovak Foundation Grant VEGA- 2/0188/15. JPA acknowledges partial funding from NAM (Nederlandse Aardolie Maatschappij) and from the French government through the UCA-JEDI Investments in the Future project managed by the National Research Agency (ANR) with the reference number ANR-15-IDEX-01. We appreciate reviews by two anonymous reviewers that helped us to improve the manuscript.
    Publisher
    Oxford University Press (OUP)
    Journal
    Geophysical Journal International
    DOI
    10.1093/gji/ggz086
    Additional Links
    https://academic.oup.com/gji/article/217/3/1783/5322168
    ae974a485f413a2113503eed53cd6c53
    10.1093/gji/ggz086
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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