Abstract
Surface geophysics has been used for a number of years to solve a variety of major groundwater exploration problems in coastal and island regions. The electrical properties of near-surface rocks are highly dependent on porosity, degree of saturation, and pore fluid resistivity (Keller and Frischknecht, 1966). Because the resistivity of the formations decreases with increasing salinity of the water content, electrical methods, such as vertical electrical soundings, time-domain electromagnetic soundings, and audiomagnetotellurics (AMT), are well-suited for mapping changes in groundwater salinity and, in particular, for detecting a fresh water-salt water interface.
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