The postearthquake stress state on the Tohoku megathrust as constrained by reanalysis of the JFAST breakout data - Université de Lorraine Access content directly
Journal Articles Geophysical Research Letters Year : 2017

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

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

Abstract

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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Earth Sciences
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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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