Variable In Situ Stress Orientations Across the Northern Hikurangi Subduction Margin

D. D. McNamara, E. Behboudi, L. Wallace, D. Saffer, A. E. Cook, A. Fagereng, M. Paganoni, Hung Yu Wu, G. Kim, H. Lee, H. M. Savage, P. Barnes, I. Pecher, L. J. LeVay, K. E. Petronotis

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2 引文 斯高帕斯(Scopus)

摘要

We constrain orientations of the horizontal stress field from borehole image data in a transect across the Hikurangi Subduction Margin. This region experiences NW-SE convergence and is the site of recurrent slow slip events. The direction of the horizontal maximum stress is E-W at an active splay thrust fault near the subduction margin trench. This trend changes to NNW-SSE in a forearc trench slope basin on the offshore accretionary wedge, and to NE-SW in the onshore forearc. Multiple, tectonic, and geological processes, either individually or in concert, may explain this variability. The observed offshore to onshore stress rotation may reflect a change from dominantly compressional tectonics at the deformation front, to a strike-slip and/or extensional tectonic regime closer to the Taupo Volcanic Zone, further inland. In addition, the offshore stress may be affected by topography and/or stress rotation around subducting seamounts, and/or temporal stress changes during the slow slip cycle.

原文English
文章編號e2020GL091707
期刊Geophysical Research Letters
48
發行號5
DOIs
出版狀態Published - 2021 三月 16

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 地球與行星科學(全部)

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