Clutha River power development, 1: Pisa Canal seismic survey

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Atkins, R.A.E. 1972 Clutha River power development, 1: Pisa Canal seismic survey. [s.l.]: [s.n.]. Report / Geophysics Division 76 9 p.

Abstract: Seismic refraction measurements were made along the south side of the Clutha valley, from 2 to 4.5 km down-stream of Luggate, to investigate the thickness of gravels overlying bedrock along the route of a proposed canal. Data were obtained along 24 profiles. Results show a thin soil layer covering unsaturated glacial gravels of variable thickness, which rest on a schist basement. At the southern end of the area surveyed profiles show the schist basement to be nearer the surface with only a soil covering in places. Unusually high schist velocities found in two sections may be due to a rough schist subsurface, or to the presence of quartz veining. Variations of schist velocity from place to place appear to be independent of direction. (auth)