Seismic surveys in Wellington Harbour, A: seismic refraction measurements in eastern Lyall Bay; B: a re-interpretation of the Point Howard seismic reflection (sparker) survey

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Davey, F.J. 1971 Seismic surveys in Wellington Harbour, A: seismic refraction measurements in eastern Lyall Bay; B: a re-interpretation of the Point Howard seismic reflection (sparker) survey. [s.l.]: [s.n.]. Report / Geophysics Division 70 20 p.

Abstract: Seismic refraction measurements have been carried out in eastern Lyall Bay with the object of investigating the depth to bedrock underlying the proposed extension of the Wellington Airport runway. Data were obtained along thirteen profiles. The results show the presence of three layers which are assumed to correspond to sedimentary cover, weathered greywacke and greywacke. The thickness of sedimentary cover increases from the shoreline, where bedrock outcrops, to a depth of about 75 m at the south-western corner of the survey area. The survey was carried out using an eight channel floating hydrophone array 425m long, and a profile consisted of firing a shot at either end of a stationary array. The problems encountered with using this equipment in a restricted area are discussed. The wide spacing of the hydrophone detectors and problems with position fixing make it only possible to calculate the gross velocity structure of the region. (auth)