Spatial Variation of Shallow Stress Orientation Along the Hikurangi Subduction Margin: Insights From In‐Situ Borehole Image Logging

Knowledge of the contemporary in‐situ stress orientations in the Earth's crust can improve our understanding of active crustal deformation, geodynamic processes, and seismicity in tectonically active regions such as the Hikurangi Subduction Margin (HSM), New Zealand. The HSM subduction interfac...

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Bibliographic Details
Published in:Journal of geophysical research. Solid earth 2022-05, Vol.127 (5), p.n/a
Main Authors: Behboudi, E., McNamara, D. D., Lokmer, I., Wallace, L. M., Saffer, D. M.
Format: Article
Language:English
Subjects:
borehole breakout
borehole image log
Boreholes
Crustal deformation
Decoupling
Deformation
Earth crust
Earthquakes
Fault lines
Fluids
Geological faults
Geophysics
Hanging walls
Heterogeneity
Hikurangi Subduction Margin
Image acquisition
Information processing
Locking
Logging
Mechanical properties
Orientation
Plate boundaries
Plate tectonics
Plates (tectonics)
Rotation
Seismic activity
Seismicity
Slip
Spatial variations
Stress
stress orientation
stress rotation
Stress state
Subduction
Subduction (geology)
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Summary:Knowledge of the contemporary in‐situ stress orientations in the Earth's crust can improve our understanding of active crustal deformation, geodynamic processes, and seismicity in tectonically active regions such as the Hikurangi Subduction Margin (HSM), New Zealand. The HSM subduction interface is characterized by varying slip behavior along strike, which may be a manifestation of combined variations in both stress state and the mechanical properties of faults and their hanging walls. Alternatively, these variations in subduction thrust slip behavior may drive heterogeneity in the stress state in space and time. In this study, we analyze borehole image and oriented four‐arm caliper logs acquired from 13 boreholes along the HSM to present a comprehensive stress orientation data set from borehole data within the shallow (
ISSN:2169-9313
2169-9356
DOI:10.1029/2021JB023641