Review of the radio frequency (RIM) method And its utilization in near-surface investigations

Electromagnetic subsurface investigation methods, with regard to frequency, span more than 12 orders of magnitude, from millihertz (e.g., complex resistivity) to gigahertz (e.g., ground penetrating radar). The range between kilohertz and low megahertz is the radio frequency band and this, unsurprisingly, is where the radio frequency investigation method (RIM) operates.