![]() ![]() This approach can be extremely effective across smaller areas, because the total size of the grid is limited to the length and spacing of the electrode cables. The first is to set up a true 3D grid of electrodes in the field and collect data in three dimensions. ![]() There are two typical approaches to modeling resistivity data in three dimensions. Karst features (possible voids, caverns, fracture zones, and solution channels) are good examples of geologic hazards that can connect laterally and vertically in the subsurface and can be more accurately modeled in a 3D space. Example of a 3D model combining five 2D resistivity tests.įor some situations, it can be helpful to incorporate 3D resistivity models to more comprehensively understand resistivity anomalies. This test results in a 2D cross-sectional profile of resistivity values with depth, providing information about the subsurface directly beneath the location of the electrode array. A typical single ER test utilizes an array of electrodes placed in a straight line at a consistent spacing across a target area. ![]() Electrical resistivity (ER) testing is an effective geophysical method to identify subsurface geologic hazards, stratigraphic variability, karst features, and hydrogeologic conditions. ![]()
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