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    Analysis of seafloor seismograms of the 2003 Tokachi-Oki earthquake sequence for earthquake early warning

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    2008GL033986.pdf (197.3Kb)
    Date
    2008-07-31
    Author
    McGuire, Jeffrey J.  Concept link
    Simons, Frederik J.  Concept link
    Collins, John A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3362
    As published
    https://doi.org/10.1029/2008GL033986
    DOI
    10.1029/2008GL033986
    Keyword
     Tokachi-Oki; Earthquake; Warning 
    Abstract
    Earthquake Early Warning (EEW) algorithms estimate the magnitude of an underway rupture from the first few seconds of the P-wave to allow hazard assessment and mitigation before the S-wave arrival. Many large subduction-zone earthquakes initiate 50–150 km offshore, potentially allowing seafloor instruments sufficient time to identify large ruptures before the S-waves reach land. We tested an EEW algorithm using accelerograms recorded offshore Hokkaido in the region of the 2003 Mw 8.1 Tokachi-Oki earthquake and its aftershocks. A wavelet transform of the first ∼4 s of the P-wave concentrates information about earthquake magnitude from both waveform amplitude and frequency content. We find that wavelets with support of a few seconds provide discriminants for EEW that are both accurate enough to be useful and superior to peak acceleration or peak velocity. Additionally, we observe a scaling of wavelet coefficient magnitude above Mw 6.0 indicating that, at least for the mainshock (Mw 8.1) and largest aftershock (Mw 7.1), the final size of a rupture could have been estimated from the initial portion of the seismogram.
    Description
    Author Posting. © American Geophysical Union, 2008. 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 35 (2008): L14310, doi:10.1029/2008GL033986.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geophysical Research Letters 35 (2008): L14310
     

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