Acquisition and preliminary processing of deep crustal seismic data at Lake Pukaki, central South Island

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SR_1995-037-pdf
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Melhuish, A.; Kleffmann, S. 1995 Acquisition and preliminary processing of deep crustal seismic data at Lake Pukaki, central South Island . Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 95/37 21 p.

Abstract: Deep crustal seismic data recorded along the eastern side of Lake Pukaki in March 1995 have provided images of the subsurface in this geologically important area east of the Alpine fault trace. The seismic experiment at Lake Pukaki was the preliminary phase of an investigation into the structure of the plate boundary in the central South Island being carried out as a joint project between American and New Zealand institutions. Both multichannel and wide-angle reflection/refraction data were recorded using 96-channel and 24-channel Strataview recorders and stand-alone three-component Reftek recorders. Shot gathers from the north end of the seismic line show a band of reflectivity at 8 to 10 s two-way-travel-time. Improvement in energy transmission across an abrupt boundary at the north end of the line is probably due to thinner glacial deposits at the north end. Techniques, logistics and preliminary results from this survey should prove useful in planning the ongoing seismic programme for this experiment in 1996 and beyond. (auth)