Resistansläge

Resistansläge, often translated as resistance mode or resistivity mode, refers to a measurement technique used primarily in geophysics to study the electrical resistivity of the Earth's subsurface. This method involves injecting electrical current into the ground through one or more electrodes and then measuring the resulting potential difference at other locations using additional electrodes. By analyzing the distribution of electrical current and voltage, geophysicists can infer variations in the subsurface resistivity.

The principle behind resistansläge is that different geological materials possess distinct electrical resistivity values. For instance, water-saturated sediments generally have lower resistivity than dry, compacted rock. Similarly, metallic ore bodies exhibit very low resistivity compared to surrounding host rocks. This contrast allows for the identification of subsurface features such as groundwater aquifers, mineral deposits, geological structures like faults and anticlines, and even buried archaeological artifacts.

The data collected in a resistansläge survey is processed to create resistivity models or maps of the subsurface. These models can be one-dimensional (depth sounding), two-dimensional (profiles), or three-dimensional, depending on the electrode configurations and survey design. The interpretation of these resistivity variations requires knowledge of the local geology and can be aided by other geophysical methods or borehole data. Resistansläge is a widely applied technique in groundwater exploration, mineral exploration, environmental studies, and geotechnical investigations.