Surface and borehole geophysics methods are utilised for delineation of various phenomena including; profiling of bedrock topography and structure, location of voids, sinkholes and old mineshafts, mapping of the water table, and integrity testing of various surface and underwater structures. The primary motivation for using geophysics is to identify target areas for detailed investigation and/or as follow up to conventional SI techniques, for example to interpolate between boreholes.
SURFACE geophysical methods used include; seismic refraction and reflection, ground penetrating radar, electromagnetic conductivity profiling / sounding, 2D resistivity imaging, resistivity sounding, microgravity, electrokinetic sounding. BOREHOLE geophysical methods used include; crosshole seismics, seismic tomography, and wireline logging.
