Seismic reflection profiling experiments in the North Canterbury Plains aquifer system

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De Vel, O.Y. 1985 Seismic reflection profiling experiments in the North Canterbury Plains aquifer system. [s.l.]: [s.n.]. Report / Geophysics Division 208. 19 p.

Abstract: As a result of being approached by the Hydrology Centre of the Ministry of Works and Development in Christchurch, Geophysics Division of the DSIR undertook a seismic reflection survey experiment in two areas of the North Canterbury Plains (Kirwee and Rolleston). The objective of the survey was to test the feasibility of using seismic reflection profiling as a cost-effective geophysical technique for delineating and imaging those sedimentary features within the gravels of the North Canterbury Plains which are associated with aquifers. This report describes and analyses the various survey techniques used in the two above mentioned areas. A variety of seismic sources, shooting geometries, geophone distributions and different line configurations were implemented. It was found that excessive ground-roll, significant signal absorption within sub-surface layers, low acoustic impedance contrast of the gravel layer interfaces, and the low reflector signal- to-noise level, gave poor results for many of the survey techniques used. Improved results were obtained when the Minisosie seismic technique was implemented. (auth)