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Victoria University Antarctic Research Expedition Science and Logistics Reports 1986-87: VUWAE 31

Recommendations

page 16

Recommendations

Preliminary examination of the seismic record suggests primary reflected energy is present to at least 800 metres sub-seafloor. Multi-channel seismics enables the removal of much of the sea-floor multiple reflector energy as well as the provision of velocity information. Thus where it is unlikely a multichannel marine seismic ship con venture the above system provides a viable alternative. Explosive sound sources despite their greater expense are the much preferred option due to their simplicity of operation and superior sound source characteristics. The joining of the two twelve channel Nimbus recorders successfully provided a 24-channel system halving the number of shots required for a single 12-channel recorder. A tracked heated cab/room environment is required for the Nimbus recorders. With an explosive sound source the rear transport could be toboggan based. The seismic line, if possible, should be bulldozed and surveyed.

Any future downhole velocity logging using a hydrophone transducer needs to be linked to the surface by a shielded logging cable.