3D Electrical Resistivity Tomography via Horizontal Electric Field Component

초록

Electrical resistivity surveys are one of the most widely used high-resolution near-surface geophysical techniques. However, conventional data acquisition methods based on collinear arrays typically measure and interpret only the electric field components aligned with the survey line. Therefore, the horizontal variations in other directions are neglected. Such a limitation is inherent in two-dimensional electrical resistivity tomography (2D ERT); however, it is a critical constraint in three-dimensional electrical resistivity tomography (3D ERT). Hence, this study proposes a method for the vectorial measurement of the horizontal components of electric field changes at potential electrode stations. This approach enables the determination of both the magnitude and direction of surface electric field variation. The resulting data are expected to improve the resolution and reliability of 3D ERT inversion.

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