EM MAPPING + RESISTIVITY IMAGING: A POWERFUL COMBINATION OF GEOPHYSICAL METHODS

Electromagnetic (EM) mapping and electrical resistivity imaging are versatile geophysical methods that, when combined, provide unparalleled insights into subsurface conditions in certain geologic settings. EM methods excel at rapidly identifying lateral variations in soil conductivity and magnetic susceptibility, while resistivity imaging delivers high-resolution depth profiles, showing subsurface variability in electrical properties. In combination, these methods allow for effective site characterization across diverse geologic settings.

Advances in GPS technology further enhance data acquisition by enabling precise spatial control, even over large or challenging areas. By integrating these geophysical techniques with accurate positioning systems, it becomes possible to streamline surveys and produce high-quality datasets for informed decision-making.

This presentation will explore applications of these methods in three distinct settings:

• In vineyard soil mapping, EM and resistivity techniques identify variations in soil properties, helping optimize viticultural practices.
• For groundwater exploration in fractured rock, the combined approach delineates aquifer zones and structural controls, supporting sustainable resource management.
• Lastly, shallow rock mapping benefits from the complementary strengths of EM and resistivity to define bedrock topography and depth with exceptional detail.

Through these examples, we demonstrate how the integration of EM mapping, resistivity imaging, and GPS technologies offers powerful tools for addressing diverse environmental and engineering challenges. We will also incorporate into this talk several examples of limitations of the methods, including environmental noise, challenging sites and/or datasets.