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

Emily E. Brodsky, Demian Saffer, Patrick Fulton, Frederick Chester, Marianne Conin, Katelyn Huffman, J. Casey Moore, Hung Yu Wu

研究成果: Article同行評審

13 引文 斯高帕斯(Scopus)

摘要

The Japan Trench Fast Drilling Project (JFAST) endeavored to establish the stress state on the shallow subduction megathrust that slipped during the M9 Tohoku earthquake. Borehole breakout data from the drill hole can constrain both the orientation and magnitude of the principal stresses. Here we reanalyze those data to refine our understanding of the stress state on the fault. In particular, we (1) improve the 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 the region is in a normal faulting regime after the earthquake is strengthened by the new analysis. The combined analysis suggests that the earthquake released sufficient elastic strain energy to reset the local stress field.

原文English
頁(從 - 到)8294-8302
頁數9
期刊Geophysical Research Letters
44
發行號16
DOIs
出版狀態Published - 2017 八月 28

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 地球與行星科學(全部)

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