Exploration technique over a wide area, using airborne, ground or ship-based equipment
for the measurement of physical properties: electric conductivity, spontaneous or
induced polarization, electromagnetism, magnetic intensity susceptibility, stray currents
(magnetotelluric currents method), speed of transmission of shockwaves (seismic method),
specific weight and gravity (gravimetric method), radioactivity, reflectance at various
wave length (infrared, radar).
Dictionnaire thématique des mines et carrières, SIM Editor.