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Variable in situ stress orientations across the Northern Hikurangi Subduction Margin

McNamara, D. D., Behboudi, E., Wallace, L., Saffer, D., Cook, A. E., Fagereng, A., Paganoni, M., Wu, Hung-Yu, Kim, G., Lee, H., Savage, H. M., Barnes, P., Pecher, I., LeVay, L. J. and Petronotis, K. E. 2021. Variable in situ stress orientations across the Northern Hikurangi Subduction Margin. Geophysical Research Letters 48 (5) , e2020GL091707. 10.1029/2020GL091707

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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
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Additional Information: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Publisher: American Geophysical Union (AGU)
ISSN: 0094-8276
Date of First Compliant Deposit: 25 March 2021
Date of Acceptance: 17 February 2021
Last Modified: 26 Mar 2021 12:30
URI: https://orca.cardiff.ac.uk/id/eprint/140118

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