Seismological evidence on characteristic time of crack healing in the shallow crust

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  • Yoshihiro Hiramatsu
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Hiroshi Honma
    Faculty of Science Kanazawa University Kanazawa Japan
  • Atsushi Saiga
    Graduate School of Science Nagoya University Nagoya Japan
  • Muneyoshi Furumoto
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Tooru Ooida
    Research Center for Seismology and Volcanology Nagoya University Nagoya Japan

書誌事項

公開日
2005-05
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2005gl022657
公開者
American Geophysical Union (AGU)

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説明

<jats:p>A continuous observation of shear wave splitting for 17 years reveals a unique temporal variation in seismic anisotropy in the shallow crust induced by a larger earthquake (M<jats:sub>W</jats:sub>5.7) beneath the Tokai region, Japan. The delay time between the fast and slow wavelets coseismically increased and then decreased back to the pre‐event value. The duration of the decreasing stage is about two years. The decrease may indicate crack healing in the upper 10 km of the crust. We approximate the temporal variation in the delay time as a function of logarithm of time, which is concordant with healing phenomena of cracks reported by laboratory experiments. The observation indicates that healing of cracks in crustal rocks is complete in approximately two years.</jats:p>

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