Articles | Volume 8, issue 3
Research article
13 Jun 2017
Research article |  | 13 Jun 2017

Electric resistivity and seismic refraction tomography: a challenging joint underwater survey at Äspö Hard Rock Laboratory

Mathias Ronczka, Kristofer Hellman, Thomas Günther, Roger Wisén, and Torleif Dahlin

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Cited articles

Bäckblom, G., Gustafsson, G., Stanfors, R., and Wikberg, P.: A synopsis of predictions before the construction of the Äspö Hard Rock Laboratory and the process of their validation, Tech. rep., SKB, Stockholm, 1990.
Berglund, J., Curtis, P., Eliasson, T., Olsson, T., Starzec, P., and Tullborg, E.: Äspö Hard Rock Laboratory, Update of the geological model 2002, Tech. rep., SKB (Swedish Nuclear Fuel and Waste Management Company), Stockholm, 2003.
Bergman, B., Tryggvason, A., and Juhlin, C.: Seismic tomography studies of cover thickness and near-surface bedrock velocities, Geophysics, 71, U77–U84,, 2006.
Brodic, B., Malehmir, A., and Juhlin, C.: Fracture System Characterization Using Wave-mode Conversions and Tunnel-surface Seismics, in: EAGE Near Surface Geophusics, EAGE, Barcelona, Spain, 2016.
Comaniciu, D. and Meer, P.: Mean Shift: A Robust Approach Toward Feature Space Analysis, IEEE T. Pattern Anal. Mach. Intell., 24, 603–619, 2002.
Short summary
Pre-investigation for tunnelling below water passages is a challenging task with the main objective of locating fracture zones that lead to low rock quality and thus reduced stability. An inversion approach was tested that combines different geophysical methods to improve the reliability of the results. A fracture zone and previously unknown sedimentary deposits were successfully detected. Synthetic studies pointed out the importance of 3-D effects and model resolution properties.