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Two main seismic sources were shared by all of the systems described above. The first, and most extensively used source, was a vibroseis truck shipped over from the University of Calgary. The 'Vibe' is essentially a vehicle which carries a heavy mass. The process of lowering the mass to the ground and vibrating it through a continuum of known frequencies (what's called a 'sweep') creates seismic waves which are used as a source of energy for seismic surveys. The second source was a well traveled 'thumper' from Otago, which generates seismic waves by dropping a mass from a given height. Both sources were used daily for shooting either into the various arrays of 'Cubes' and Aries lines or the downhole instruments from different locations throughout the valley. The vibe truck alone did roughly 9000 sweeps during the two weeks of shooting.  Thanks in part to a Marsden grant,  Vic students Danielle Lindsay (summer student with newly coronated head of school John Townend) and Chet Hopp (PhD, Geophysics) were on hand to provide much needed muscle and moral support. Thier responsibilities were varied but mostly consisted of deployment, maintenance and retrieval of the various above-ground seismic systems. In particular, the Aries II system from Calgary required multiple days to lay out the kilometers of cable, batteries and geophones as well as regular daily maintenance and troubleshooting.