Resistivity imaging now becomes more and more popular in electrical exploration, due to its ability to efficiently and effectively produce images of the subsurface as a result of the availability of automated data acquisition systems and efficient user-friendly inversion software. One of the major limitations of the technique today is the time-consuming measurement process that tempts data acquisition teams to reduce the data density in order to save expensive field operation time, which in turn can be devastating for the imaging quality. In this paper, two electrode configurations suitable for multi-channel-recording, called gradient array (GD) and the midpoint-potential-referred measurement (MPR), were numerically examined for 2D resistivity imaging. These electrode configurations are well suited for multi-channel data acquisition systems, so that many data-points can be recorded simultaneously for each current injection, so as to reduce fieldwork time very significantly without compromising the data density. First, numerical experiments were conducted to examine the spatial resolution and surveying efficiencies for different data acquisition schemes. The results are compared with the results achieved for the same models with the Wenner-α (WN), Schlumberger (SC), dipole-dipole (DD) and pole-dipole (PD) arrays (Dahlin and Zhou 2001). Then field experiments were done, and results from at a waste dump are presented here.


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