Figure 2. Deployment of geophones on an alpine bedrock surface in Fiordland, New Zealand. The portable seismic array uses 8 to 12 geophones that are deployed in a linear array across distances of up to 60 meters. A local seismic wave is generated with a hammer blow at one end of the array. The time for the first seismic wave (a compressional wave) to arrive at each geophone yields insights into the velocity profile of the subsurface, which in turn can be used to interpret changes in fracture density from the surface to depths of around 20 meters.
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Oct9 09
