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Articles | Volume 17, issue 2
Articles | Volume 17, issue 2
https://doi.org/10.5194/se-17-275-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-17-275-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 17, issue 2
Research article
 | 
17 Feb 2026
Research article |  | 17 Feb 2026

Multi-scale hydraulic and petrophysical characterization of a heterogeneous fault zone in the Gotthard massif's crystalline basement

Tom Schaber, Mohammedreza Jalali, Alberto Ceccato, Alba Simona Zappone, Giacomo Pozzi, Valentin Gischig, Marian Hertrich, Men-Andrin Meier, Timo Seemann, Hannes Claes, Yves Guglielmi, Domenico Giardini, Stefan Wiemer, Massimo Cocco, and Florian Amann

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Short summary
We studied a deep fault zone in Switzerland to gain a better understanding of how water moves through faults and how this affects earthquake activity. Using field and laboratory tests, we found that flow is strongly controlled by open fractures and permeability changes significantly with scale. Small samples underestimate flow compared to larger tests. Our results show that faults are heterogeneous, highlighting the need for site-specific studies when assessing risks or planning experiments.
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