Geophysical investigations are rapid and economic and are proven to be very effective in certain conditions. However, interpretation of geophysical data requires expertise and experience of the investigator. The investigation is mainly non-invasive and utilizes some specific properties of soil like density, electrical resistivity, seismic, magnetic, electromagnetic etc. to differentiate soil layers, obtain depth of water table, exhibit inclusion of foreign bodies, demarcate location of bed rock, etc. Apart from soil investigation, the geophysical methods are also extensively used in exploration of fossil fuels, mineral deposits, archeological investigation, dam leakage, contaminant flow, etc.