Articles | Volume 11, issue 6
https://doi.org/10.5194/se-11-2425-2020
https://doi.org/10.5194/se-11-2425-2020
Research article
 | 
11 Dec 2020
Research article |  | 11 Dec 2020

Micro- and nano-porosity of the active Alpine Fault zone, New Zealand

Martina Kirilova, Virginia Toy, Katrina Sauer, François Renard, Klaus Gessner, Richard Wirth, Xianghui Xiao, and Risa Matsumura

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Cited articles

Andrew, M.: A quantified study of segmentation techniques on synthetic geological XRM and FIB-SEM images, Comput. Geosci., 22, 1503–1512, 2018. 
Berryman, K. R., Cochran, U. A., Clark, K. J., Biasi, G. P., Langridge, R. M., and Villamor, P.: Major earthquakes occur regularly on an isolated plate boundary fault, Science, 336, 1690–1693, 2012. 
Blackburn, E. D., Hadizadeh, J., and Babaie, H. A.: A microstructural study of SAFOD gouge from actively creeping San Andreas Fault zone: Implications for shear localization models, in: AGU Fall Meeting Abstracts, 2009. 
Boulton, C., Carpenter, B. M., Toy, V., and Marone, C.: Physical properties of surface outcrop cataclastic fault rocks, Alpine Fault, New Zealand, Geochem. Geophy. Geosy., 13, Q01018, https://doi.org/10.1029/2011GC003872, 2012. 
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Short summary
Processes associated with open pores can change the physical properties of rocks and cause earthquakes. In borehole samples from the Alpine Fault zone, we show that many pores in these rocks were filled by weak materials that can slide easily. The amount of open spaces was thus reduced, and fluids circulating within them built up high pressures. Both weak materials and high pressures within pores reduce the rock strength; thus the state of pores here can trigger the next Alpine Fault earthquake.