Controls on fault zone structure and brittle fracturing in the foliated hanging wall of the Alpine Fault

Williams, Jack N.; Toy, Virginia G.; Massiot, Cécile; McNamara, David D.; Smith, Steven A. F.; Mills, Steven

doi:https://doi.org/10.5194/se-9-469-2018

Articles | Volume 9, issue 2

https://doi.org/10.5194/se-9-469-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/se-9-469-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 9, issue 2

Research article

|

23 Apr 2018

Research article |

| 23 Apr 2018

Controls on fault zone structure and brittle fracturing in the foliated hanging wall of the Alpine Fault

Jack N. Williams, Virginia G. Toy, Cécile Massiot, David D. McNamara, Steven A. F. Smith, and Steven Mills

Supplement

https://doi.org/10.5194/se-9-469-2018-supplement

Data sets

X-ray Computed Tomography and borehole televiewer images of the Alpine Fault's hanging-wall, New Zealand: Deep Fault Drilling Project phase 1 (DFDP-1) and Amethyst Hydro Project (AHP) J. Williams, V. Toy, C. Massiot, and D. McNamara https://doi.org/10.5880/ICDP.5052.004

Model code and software

Generating circumferential images of tomographic drill-core scans S. Mills and J. Williams https://doi.org/10.5880/ICDP.5052.005

Short summary

We present new data on the orientation of fractures, their fill, and their density around the Alpine Fault, a plate boundary fault on the South Island of New Zealand. Fractures < 160 m of the fault are filled and show a range of orientations, whilst fractures at greater distances (< 500 m) are open and parallel to the rock's mechanical weakness. We interpret the latter fracture set to reflect near-surface processes, whilst the latter are potentially linked to deep-seated Alpine Fault seismicity.