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Keywords: superficial layer
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Proceedings Papers

Paper presented at the 5th ISRM Congress, April 10–15, 1983
Paper Number: ISRM-5CONGRESS-1983-085
... refraction survey (Fig.7) indicated the presence of a superficial layer of low quality rock characterized by a seismic velocity of 1.7- 2.5 km/s; this layer is virtually absent at the bottom of the valley, whereas its thickness increases towards the higher elevation along the slopes. Wellbore Design...

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