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    Widespread seismicity excitation throughout central Japan following the 2011 M=9.0 Tohoku earthquake and its interpretation by Coulomb stress transfer

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    Article (5.060Mb)
    Figure S1: Coulomb stress changes resolved on the nodal planes of the background earthquakes as proxies of local or regional fault structure in Chubu and Kinki districts. (2.833Mb)
    Figure S2: Seismic response of the entire Japan to the M=9.0 Tohoku mainshock and peak ground acceleration. (5.713Mb)
    Figure S3: Coulomb stress change on the nodal planes of post-Tohoku earthquakes. (1.807Mb)
    Additional file information (2.258Kb)
    Date
    2011-08-06
    Author
    Toda, Shinji  Concept link
    Stein, Ross S.  Concept link
    Lin, Jian  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4791
    As published
    https://doi.org/10.1029/2011GL047834
    DOI
    10.1029/2011GL047834
    Keyword
     Coulomb stress; Central Japan; Seismicity excitation 
    Abstract
    We report on a broad and unprecedented increase in seismicity rate following the M=9.0 Tohoku mainshock for M ≥ 2 earthquakes over inland Japan, parts of the Japan Sea and Izu islands, at distances of up to 425 km from the locus of high (≥15 m) seismic slip on the megathrust. Such an increase was not seen for the 2004 M=9.1 Sumatra or 2010 M=8.8 Chile earthquakes, but they lacked the seismic networks necessary to detect such small events. Here we explore the possibility that the rate changes are the product of static Coulomb stress transfer to small faults. We use the nodal planes of M ≥ 3.5 earthquakes as proxies for such small active faults, and find that of fifteen regions averaging ∼80 by 80 km in size, 11 show a positive association between calculated stress changes and the observed seismicity rate change, 3 show a negative correlation, and for one the changes are too small to assess. This work demonstrates that seismicity can turn on in the nominal stress shadow of a mainshock as long as small geometrically diverse active faults exist there, which is likely quite common.
    Description
    Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 38 (2011): L00G03, doi:10.1029/2011GL047834.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Article: Toda, Shinji, Stein, Ross S., Lin, Jian, "Widespread seismicity excitation throughout central Japan following the 2011 M=9.0 Tohoku earthquake and its interpretation by Coulomb stress transfer", Geophysical Research Letters 38 (2011): L00G03, DOI:10.1029/2011GL047834, https://hdl.handle.net/1912/4791
     

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