Afterslip associated with interplate earthquakes and the viscoelastic behavior of rocks

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  • Kawada Yusuke
    Department of Geoenvironmental Sciences, Graduate School of Science, Tohoku University Present address; School of GeoSciences, University of Edinburgh, Grant Institute
  • Nagahama Hiroyuki
    Department of Geoenvironmental Sciences, Graduate School of Science, Tohoku University
  • Uchida Naoki
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • Matsuzawa Toru
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University

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Other Title
  • プレート境界地震に伴う余効すべりと岩石の粘弾性挙動
  • プレート キョウカイ ジシン ニ トモナウ ヨコウスベリ ト ガンセキ ノ ネンダンセイ キョドウ

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Temporal changes in afterslip displacement rate associated with interplate earthquakes are investigated using a constitutive law for the viscoelastic behavior of rocks. The law is based on irreversible thermodynamics with internal state variables and is derived as the relaxation modulus following a temporal power law that emerges as the collective dynamics of internal states with respective relaxation times at various time-scales. The constitutive law can represent the transient behavior in response to sudden changes in stress and strain rate, as well as the steady-state behavior of rocks. Analysis of afterslip (cumulative displacement) time series estimated from the seismic moments of small repeating earthquakes in the northeastern Japan subduction zone shows that the temporal change in afterslip follows a temporal power law. This finding suggests that afterslip comprises many transient responses associated with seismic events of various sizes.

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