P-waves imaging of the FRI and BK zones at the Grimsel Rock Laboratory

Technical Report · Wed Aug 01 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/6365598· OSTI ID:6365598

Majer, E L; Peterson, Jr, J E ^[1]; Blueming, P; Sattel, G ^[2]

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1. Lawrence Berkeley Lab., CA (USA)
2. Swiss National Cooperative for the Storage of Nuclear Waste, Baden (Switzerland)

This report is one of a series documenting the results of the Nagra-DOE Cooperative (NDC-I) research program in which the cooperating scientists explore the geological, geophysical, hydrological, geochemical, and structural effects anticipated from the use of a rock mass as a geological repository for nuclear waste. Tomographic imaging studies using a high frequency (10 Khz.) piezoelectric source and a three component receiver were carried out in two different regions of the underground Nagra Grimsel test facility in Switzerland. Both sites were in fractured granite, one being in a strongly foliated granite (FRI site), and the other being in a relatively homogeneous granite (BK zone). The object of the work was to determine if the seismic techniques could be useful in imaging the fracture zones and provide information on the hydrologic conditions. Both amplitude and velocity tomograms were obtained from the Data. The results indicate that the fracture zones strongly influenced the seismic wave propagation, thus imaging the fracture zones that were hydrologically important. 11 refs., 24 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA); Nationale Genossenschaft fuer die Lagerung Radioaktiver Abfaelle (NAGRA), Baden (Switzerland)
• Sponsoring Organization: DOE/ER; NAGRA
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6365598
• Report Number(s): LBL-28807; NDC--4; ON: DE91004135
• Country of Publication: United States
• Language: English

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