We investigated the utility of 3D multielectrode resistivity soundings made using a<br>mini-ma1 number of electrodes. We compared 2D and 3D resistivity soundings made with<br>a X-electrode DC resistivity system over shallow karst bedrock at a site in eastern<br>Pennsylvania. We found that combining multiple 2D resistivity profiles, inverted<br>assuming 2D geology, produced a better image of the subsurface than a single 3D<br>sounding that covered the same area, but with fewer and more widely spaced electrodes<br>in each horizontal direction. We conclude that with commercially available<br>multielectrode resistivity systems it is better to ignore 3D effects and collect high-density<br>2D resistivity data than to sacrifice resolution by collecting 3D data on a less dense array.


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