Question

In a multi-electrode resistivity tomography (ERT) survey, using equally spaced electrodes, which of the given configurations will provide the maximum number of data points?

• A. Wenner array
• B. Axial Dipole-dipole array
• C. Axial Pole-dipole array
• D. Schlumberger array

Hint:

The choice of array in ERT surveys impacts the resolution and density of the data collected. The Axial Pole-dipole array maximizes the number of data points.

Answer 1

The Correct Option is C

In an ERT survey, different electrode configurations provide different levels of spatial resolution and data collection. The Axial Pole-dipole array configuration generally gives the maximum number of data points, as it maximizes the coverage of the resistivity distribution in the subsurface.
- Wenner array is good for general resistivity profiling but does not provide as many data points as the Axial Pole-dipole array.
- Axial Dipole-dipole array also has a good distribution of data points, but the Axial Pole-dipole array tends to be more efficient in terms of resolving subsurface resistivity.
- Schlumberger array is often used for deep investigations, but it is less dense compared to the Axial Pole-dipole array in terms of the number of data points.
Therefore, the Axial Pole-dipole array configuration will provide the maximum number of data points.