Abstract
In continuation to various ground geophysics conducted at the Åknes unstable rock-slope area during the past 15 years, NVE commissioned additional seismic investigations aimed at helping to determine the thickness of fractured bedrock as well as possible faulting. NGU has done extensive testing on the use of Rayfract® program and obtained knowledge via modeling and real data processing as to the optimized parameters when fracture zones in bedrock are investigated. NVE has provided NGU with the data to undergo such reprocessing and in this sense, we have produced starting models using Hagedoorn's Plus-Minus method and Midpoint Breaks and then implemented Multirun WET inversion using 7 runs of maximum 50 iterations and minimal smoothing. Possible fracture zones were also compared against similar interpretations obtained by ERT to check coherence between methods. Finally, results were delivered to NVE in ASCII format to be part of a multidisciplinary Åknes 3D model built in PETREL.
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