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Geophysical exploration is dedicated to studying the physical properties of the subsoil; normally, it is used in the search for natural resources such as: oil, underground water, metallic minerals, geothermal deposits, etc. On other occasions it is used for archaeological investigations; determination of wastewater structures and drinking water supply pipes (when there are no design plans). The applications are very diverse and there are several applicable methods, which use different physical properties of matter such as: electromagnetism, electrical resistivity, wave propagation (seismic), gravitational attraction (gravimetry). These properties are closely related to the characteristics of the subsoil and the geological nature of the materials in depth. They help locate and sometimes determine the dimensions of the resource sought. This research addresses the case of geoelectric methods applied to hydrogeological exploration. To carry out this type of exploration, a direct current source is required, which can manipulate the amount of current injected into the subsoil, and a voltmeter, capable of detecting the potential differences that are generated by injecting the current. This is known as the four-pointed method. From the values of current and voltage difference obtained, the electrical resistivity of the subsoil is calculated.

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Prospección Geofísica como herramienta para la caracterización hidrogeológica del acuífero transfronterizo Ocotepeque-Citalá (ATOC), Región Trifinio, El Salvador-Honduras