Variable In Situ Stress Orientations Across the Northern Hikurangi Subduction Margin


McNamara, DD ORCID: 0000-0001-9789-2436, Behboudi, E, Wallace, L, Saffer, D, Cook, AE, Fagereng, A, Paganoni, M, Wu, Hung‐Yu, Kim, G, Lee, H et al (show 5 more authors) (2021) Variable In Situ Stress Orientations Across the Northern Hikurangi Subduction Margin Geophysical Research Letters, 48 (5). ISSN 0094-8276, 1944-8007

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: borehole breakouts, borehole image logs, Hikurangi, IODP, slow slip earthquakes, stress orientation, subduction
Divisions: Faculty of Science & Engineering > School of Environmental Sciences
Depositing User: Symplectic Admin
Date Deposited: 15 Mar 2021 11:36
Last Modified: 28 Feb 2026 23:41
DOI: 10.1029/2020gl091707
Open Access URL: https://doi.org/10.1029/2020GL091707
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3117354
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