Modelling of the phase behaviour in the SNMR-Signal

Surface Nuclear Magnetic Resonance (SNMR) is a fairly new geophysical method for groundwater exploration and aquifer characterization (e.g. Yaramanci 2000). The NMR-Experiment is conducted by a coincident transmitter and receiver loop at the surface exciting the protons of water molecules underground with the Larmor frequency of the earth’s magnetic field. Conducting a SNMR measurement with increasing excitation intensity yields a complex sounding curve, where the amplitude of the relaxation signal is determined by the numbers of protons i.e. the water content and the phase is sensitive to the subsurface conductivity.