Modeling the rupture process of the 2003 September 25 Tokachi‐Oki (Hokkaido) earthquake using 1‐Hz GPS data

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  • Shin'ichi Miyazaki
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • Kristine M. Larson
    Department of Aerospace Engineering Sciences University of Colorado Boulder Colorado USA
  • Kyuhong Choi
    Department of Aerospace Engineering Sciences University of Colorado Boulder Colorado USA
  • Kazuhito Hikima
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • Kazuki Koketsu
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • Paul Bodin
    CERI University of Memphis Memphis Tennessee USA
  • Jennifer Haase
    Department of Earth and Atmospheric Sciences Purdue University West Lafayette Indiana USA
  • Gordon Emore
    Department of Earth and Atmospheric Sciences Purdue University West Lafayette Indiana USA
  • Atsushi Yamagiwa
    Geographical Survey Institute Tsukuba Japan

抄録

<jats:p>High‐rate GPS has the potential to recover both dynamic and static displacements accurately. We analyze 1‐Hz GPS data recorded during the 2003 Tokachi‐Oki earthquake. The 1‐Hz GPS displacement waveforms show good agreement with integrated accelerometer records except for low frequency noise that are inherently present in integrated seismic records. The GPS waveforms were inverted to model the spatio‐temporal evolution of the fault slip during the rupture. The slip is found to propagate downdip in the subduction zone with largest moment release ∼50 km northwest of the hypocenter. The region of largest slip agrees in general with traditional seismic studies, indicating that 1‐Hz GPS can be used for finite fault studies. The 1‐Hz GPS slip model shows clearer contrast with afterslip distributions than those inferred from strong motion data, possibly because 1‐Hz GPS is more sensitive to cumulative slip distribution.</jats:p>

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