2017
DOI: 10.5194/se-8-671-2017
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Electric resistivity and seismic refraction tomography: a challenging joint underwater survey at Äspö Hard Rock Laboratory

Abstract: Abstract. Tunnelling below water passages is a challenging task in terms of planning, pre-investigation and construction. Fracture zones in the underlying bedrock lead to low rock quality and thus reduced stability. For natural reasons, they tend to be more frequent at water passages. Ground investigations that provide information on the subsurface are necessary prior to the construction phase, but these can be logistically difficult. Geophysics can help close the gaps between local point information by produc… Show more

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Cited by 57 publications
(34 citation statements)
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“…Parallel to our seismic experiment, an independent seismic survey was conducted on the sea above the tunnel, next to a small island in the central part of the site (Figure ; marine seismic experiment arrow) [see Ronczka et al ., ]. Data from four of these explosive sources were merged into our data set.…”
Section: äSpö Hrl Seismic Experimentsmentioning
confidence: 99%
“…Parallel to our seismic experiment, an independent seismic survey was conducted on the sea above the tunnel, next to a small island in the central part of the site (Figure ; marine seismic experiment arrow) [see Ronczka et al ., ]. Data from four of these explosive sources were merged into our data set.…”
Section: äSpö Hrl Seismic Experimentsmentioning
confidence: 99%
“…The inversion converged both for electrical resistivity and integral chargeability, obtaining a mean residual of the weighted squared error <1 in 15 iterations. The coverage, which is the overall integral sensitivity for all measurements in each model cell normalised by the cell volume, is a robust estimate of model resolution and, thus, reliability, as demonstrated by Ronczka et al (). Therefore, we restricted all images of the results to a minimum threshold so that only well‐resolved structures in the model are shown.…”
Section: Resultsmentioning
confidence: 89%
“…The cable outlets on land were connected to plate electrodes, which were buried where glacial sediments were present and attached on the granite bedrock with a conductive gel on outcrops. More details of the ERT data acquisition can be found in Ronczka et al (2017). ERT stations used for joint inversion are marked by green dots in Fig.…”
Section: Data Acquisition and Qualitymentioning
confidence: 99%