Geophysical Survey

Geophysical survey as a scientific method

I interpret the sub-surface breaks combined with spontaneous potential (SP) for the flow of water in ground and soil.

Resistivity is fundamentally related to Ohm's Law measuring Resistance. Resistance is defined as the voltage divided by the current (R = V/I) and the value of a material's resistance depends on the resistivity of that material. Resistivity is the value of resisting power of a certain material to the flow of a moving current.

These resistance values are converted to apparent resistivity values using the formula:

Ρα=κV/I

where Ρa = apparent resistivity and κ = geometric factor. The geometric factor varies based on the geometry of each electrode spacing setup.

In typical field work, data is acquired as apparent resistivity values and later interpreted to obtain true resistivity.