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    Bayesian Estimation of Source Parameters and Associated Coulomb Failure Stress Changes for the 2005 Fukuoka (Japan) Earthquake

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    Type
    Article
    Authors
    Dutta, Rishabh cc
    Jonsson, Sigurjon cc
    Wang, Teng cc
    Vasyura-Bathke, Hannes cc
    KAUST Department
    Crustal Deformation and InSAR Group
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-12-21
    Online Publication Date
    2017-12-21
    Print Publication Date
    2018-04-01
    Permanent link to this record
    http://hdl.handle.net/10754/626432
    
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    Abstract
    Several researchers have studied the source parameters of the 2005 Fukuoka (northwestern Kyushu Island, Japan) earthquake (MW 6.6) using teleseismic, strong motion and geodetic data. However, in all previous studies, errors of the estimated fault solutions have been neglected, making it impossible to assess the reliability of the reported solutions. We use Bayesian inference to estimate the location, geometry and slip parameters of the fault and their uncertainties using Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) data. The offshore location of the earthquake makes the fault parameter estimation challenging, with geodetic data coverage mostly to the southeast of the earthquake. To constrain the fault parameters, we use a priori constraints on the magnitude of the earthquake and the location of the fault with respect to the aftershock distribution and find that the estimated fault slip ranges from 1.5 m to 2.5 m with decreasing probability. The marginal distributions of the source parameters show that the location of the western end of the fault is poorly constrained by the data whereas that of the eastern end, located closer to the shore, is better resolved. We propagate the uncertainties of the fault model and calculate the variability of Coulomb failure stress changes for the nearby Kego fault, located directly below Fukuoka city, showing that the mainshock increased stress on the fault and brought it closer to failure.
    Citation
    Dutta R, Jónsson S, Wang T, Vasyura-Bathke H (2017) Bayesian Estimation of Source Parameters and Associated Coulomb Failure Stress Changes for the 2005 Fukuoka (Japan) Earthquake. Geophysical Journal International. Available: http://dx.doi.org/10.1093/gji/ggx551.
    Sponsors
    We thank Shin’ichi Miyazaki (Kyoto Univ.) for discussions and the Earthquake Research Institute (Univ. Tokyo) for hosting SJ during the early part of this work. Comments from Yukitoshi Fukahata (Kyoto Univ.) and an anonymous reviewer improved the manuscript. We thank Chiheb Hammouda (KAUST) for fruitful discussions. The ENVISAT data were provided by the European Space Agency through category-1 project 3639. Generic Mapping Tools (GMT) were used to make Figure 1. This research was supported by King Abdullah University of Science and Technology (KAUST).
    Publisher
    Oxford University Press (OUP)
    Journal
    Geophysical Journal International
    DOI
    10.1093/gji/ggx551
    Additional Links
    https://academic.oup.com/gji/advance-article/doi/10.1093/gji/ggx551/4769641
    ae974a485f413a2113503eed53cd6c53
    10.1093/gji/ggx551
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program; Earth Science and Engineering Program

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