The postearthquake stress state on the Tohoku megathrust as constrained by reanalysis of the JFAST breakout data - Université de Lorraine Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2017

The postearthquake stress state on the Tohoku megathrust as constrained by reanalysis of the JFAST breakout data

Emily Brodsky
  • Fonction : Auteur
Demian Saffer
  • Fonction : Auteur
Patrick Fulton
  • Fonction : Auteur
Frederick Chester
  • Fonction : Auteur
Marianne Conin
Katelyn Huffman
  • Fonction : Auteur
J. Casey Moore
  • Fonction : Auteur
Hung-Yu Wu
  • Fonction : Auteur

Résumé

The Japan Trench Fast Drilling Project (JFAST) endeavored to establish the stress state on theshallow subduction megathrust that slipped during theM9 Tohoku earthquake. Borehole breakout datafrom the drill hole can constrain both the orientation and magnitude of the principal stresses. Here wereanalyze those data to refine our understanding of the stress state on the fault. In particular, we (1) improvethe identification of breakouts, (2) consider a fuller range of stress states consistent with the data, and (3)incorporate new and more robust laboratory constraints on rock strength. The original conclusion that theregion is in a normal faulting regime after the earthquake is strengthened by the new analysis. The combinedanalysis suggests that the earthquake released sufficient elastic strain energy to reset the local stressfield.
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hal-02982537 , version 1 (18-11-2021)

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Emily Brodsky, Demian Saffer, Patrick Fulton, Frederick Chester, Marianne Conin, et al.. The postearthquake stress state on the Tohoku megathrust as constrained by reanalysis of the JFAST breakout data. Geophysical Research Letters, 2017, 44 (16), pp.8294-8302. ⟨10.1002/2017GL074027⟩. ⟨hal-02982537⟩
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