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Articles | Volume 17, issue 2
Articles | Volume 17, issue 2
https://doi.org/10.5194/se-17-347-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/se-17-347-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 17, issue 2
Research article
 | 
26 Feb 2026
Research article |  | 26 Feb 2026

New insights on the fault structure of Bedretto geothermal testbed and the associated seismicity based on active seismic crosshole tomography

Miriam Larissa Schwarz, Hansruedi Maurer, Anne Christine Obermann, Paul Antony Selvadurai, Alexis Shakas, Stefan Wiemer, and Domenico Giardini

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Short summary
We applied fat ray travel time tomography to image the geothermal testbed at the BedrettoLab (Switzerland). An active seismic crosshole survey provided a dataset of 41’881 manually picked first breaks. The complex major fault zone was identified by a 3D velocity model and validated with wireline logs and geological observations. Induced seismicity from hydraulic stimulation experiments preferentially occurs in intermediate-velocity regions, possibly due to the presence of stress gradients.
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Special issue
Seismic imaging from the lithosphere to the near surface