Shear wave experiments at the US site at the Grimsel laboratory

Technical Report · Sun Jul 01 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/6365573· OSTI ID:6365573

Majer, E L; Peterson, Jr, J E ^[1]; Bluemling, 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)

As part of the United States Department of Energy (USDOE) cooperative project with the National Cooperative for the Storage of Radioactive Waste (Nagra) of Switzerland, there have been a series of studies carried out at the Nagra underground test facility at Grimsel. The Grimsel test facility is several 3.5 meter diameter tunnels excavated with a tunnel boring machine in the southern Swiss Alps. The rock type is granitic, although there is a large variation in the granitic fabric throughout the facility. The work described here was the first phase of a multiyear project to evaluate and develop seismic imaging techniques for fracture detection and characterization for the use in siting underground nuclear waste facilities. Data from a crosshole tomographic survey in the Underground Seismic (US) site at the Nagra Grimsel test facility in Switzerland and successfully reprocessed to enhance the S-wave arrivals. The results indicate that in a saturated granite Vp/Vs ratios approach 2.0 in the fractured rock. These results indicate that S-wave data would be very useful for fracture detection, especially in detecting thinner fractures.

• 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: 6365573
• Report Number(s): LBL-28808; NDC--7; ON: DE91004134
• Country of Publication: United States
• Language: English

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58 GEOSCIENCES
580000 -- Geosciences
ALPS
BOREHOLES
CAVITIES
COORDINATED RESEARCH PROGRAMS
DATA PROCESSING
DETECTION
DIAGNOSTIC TECHNIQUES
EUROPE
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
GRANITES
HYDROLOGY
IGNEOUS ROCKS
MANAGEMENT
MOUNTAINS
NATIONAL ORGANIZATIONS
NUCLEAR FACILITIES
PLUTONIC ROCKS
PROCESSING
RADIOACTIVE WASTE FACILITIES
RADIOACTIVE WASTE STORAGE
RESEARCH PROGRAMS
ROCKS
SATURATION
SEISMIC DETECTION
SEISMIC P WAVES
SEISMIC S WAVES
SEISMIC SURVEYS
SEISMIC WAVES
SITE CHARACTERIZATION
STORAGE
SURVEYS
SWITZERLAND
TOMOGRAPHY
TUNNELS
UNDERGROUND FACILITIES
UNDERGROUND STORAGE
US DOE
US ORGANIZATIONS
WASTE MANAGEMENT
WASTE STORAGE
WAVE PROPAGATION
WESTERN EUROPE