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Variable in-situ stress orientations across the northern Hikurangi Subduction Margin
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  • David Daniel McNamara,
  • Effat Behboudi,
  • Laura Wallace,
  • Demian M Saffer,
  • Ann Elizabeth Cook,
  • Ake Fagereng,
  • Matteo Paganoni,
  • Wu Hung-Yu,
  • Gil Young Kim,
  • Hikweon Lee,
  • Heather Savage,
  • Philip Barnes,
  • Ingo Pecher,
  • Leah J. LeVay,
  • Katerina Petronotis
David Daniel McNamara
University of Liverpool

Corresponding Author:d.mcnamara@liverpool.ac.uk

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Effat Behboudi
Irish Centre for Research in Applied Geoscience, University College Dublin
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Laura Wallace
GNS Science
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Demian M Saffer
University of Texas at Austin
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Ann Elizabeth Cook
Ohio State University
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Ake Fagereng
Cardiff University
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Matteo Paganoni
University of Oxford, Department of Earth Sciences
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Wu Hung-Yu
Department of Resources Engineering, National Cheng Kung University
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Gil Young Kim
Korea Institute of Geoscience & Mineral Resources(KIGAM)
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Hikweon Lee
Korea Institute of Geoscience and Mineral Resources
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Heather Savage
UC - Santa Cruz
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Philip Barnes
National Institute of Water & Atmospheric Research
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Ingo Pecher
University of Auckland
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Leah J. LeVay
International Ocean Discovery Program, Texas A&M University
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Katerina Petronotis
Texas A&M University
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We constrain the orientation of the horizontal stress field from borehole image data in a transect across the Hikurangi Subduction Margin. This region experiences NW-SE convergence leading to recurrent slow slip events. The direction of the horizontal maximum stress is E-W at an active thrust fault near the subduction margin trench. This trend changes to NNW-SSE in the Tuaheni Basin in 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. A general offshore-onshore stress rotation may reflect a change from dominantly compressional tectonics at the deformation front, to a strike-slip and/or extensional stress regime closer to the Taupo Volcanic Zone. 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.