TECHNIQUES TECHNIQUES OVERVIEW OF OUR GEOPHYSICAL TECHNIQUES SEISMIC REFRACTION DOWNHOLE SEISMIC SEISMIC REFLECTION MULTI-CHANNEL ANALYSIS OF SURFACE WAVES REFRACTION MICROTREMOR GROUND PENETRATING RADAR Gravimetric MAGNETICS ELECTRICAL RESISTIVITY INDUCED POLARISATION SPONTANEOUS POTENTIAL FREQUENCY DOMAIN ELECTROMAGNETICS TIME DOMAIN ELECTROMAGNETICS RADIOMETRIC SURVEYS FREQUENCY DOMAIN ELECTROMAGNETICS TIME DOMAIN ELECTROMAGNETICS