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- Volume 10, Issue 1, 1992
First Break - Volume 10, Issue 1, 1992
Volume 10, Issue 1, 1992
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How to handle rugged topography in airborne gamma-ray spectrometry surveys
Authors G.F. Schwarz, E. Klingelé and L. RybachThis paper describes the procedure adopted by the Swiss Geophysical Commission in reducing the effects of topography on airborne gamma-ray speetrometry measurements. The influence of topographic irregularities on the gamma-ray field has been modelled in both two and three dimensions. The calculations have shown that the influence of topography cannot be neglected in regions of rugged topography such as the Swiss Alps. It is shown that these effects can be corrected adequately in most practical circumstances with a procedure based on model calculations.
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Prediction ahead of the tunnel face by seismic methods - pilot project in Centovalli Tunnel, Locarno, Switzerland
More LessIn planning the construction of a tunnel, a geological prognosis is necessary. The reliability of the prognosis is directly related to the amount of information available from surface geology, drillholes and geophysical surface investigations. During the excavation phase the tunnel engineer requires detailed and quantitative information about abrupt changes in rock quality and formation boundaries lying ahead, and these cannot always be obtained from surface investigations.
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)