Hydrogeological investigations to delineate zones of high groundwater potential in five selected communities in the Agona East District of Ghana have been successfully carried out using the magnetotelluric geophysical technique. The technique has successfully been applied to delineate potential zones of high groundwater potential in terms of location and depth-to-aquifer zones. The study has revealed that the apparent electrical resistivity of the subsurface of the study area to a depth of 300 m displays the stratigraphic layers of different resistivities. Eburnean Plutonic suite and the Tamnean Plutonic Suite were the two major geologic materials encountered in the study area. The Eburnean Plutonic suite shows relatively low resistivity rang of 0–480 Ωm at a depth of 0–300 m which indicates the presence of weathered zones capable of holding water. However, the Tamnean Plutonic Suites shows a resistivity range of 200–2800 Ωm which shows that it is a consolidated rock with no developed primary and/or secondary hydrogeological properties such as porosity and permeability. Therefore, the exploration of groundwater in the Tamnean Plutonic Suite depends strictly on the fracture zones which may contain water. Again, the study revealed that the prevailing aquifer systems of the study area are not regional but are controlled by fractures and weathered zones. Therefore, it is highly envisaged that groundwater would be intersected at the saprock region which is the fractured and weathered zone between fresh bedrock and the regolith at the depth of 80–100 m. Also, the study has shown the capability of the magnetotelluric geophysical technique to delineate zones of high groundwater potentials for borehole drilling purpose.

中文翻译：

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大地电磁地球物理技术在加纳阿格纳东区五个社区的钻井潜在高地下水位区划中的应用

利用大地电磁地球物理技术已经成功地进行了水文地质调查，以描绘出加纳阿格纳东区五个选定社区的高地下水位区域。该技术已成功地用于根据位置和深度-含水层区划出高地下水位的潜在区。研究表明，研究区域地下至300 m的表观电阻率显示出不同电阻率的地层。Eburnean Plutonic套件和Tamnean Plutonic套件是研究区域遇到的两个主要地质材料。Eburnean Plutonic套件在0-300 m的深度处显示相对较低的电阻率范围（0-480Ωm），这表明存在能够容纳水的风化带。但是，坦姆尼岩Plutonic Suites的电阻率范围为200–2800Ωm，这表明它是固结岩石，没有发达的一级和/或二级水文地质特性，例如孔隙度和渗透率。因此，在塔姆南岩溶岩层组中开采地下水严格取决于可能含有水的裂缝带。再次，该研究表明，研究区域的主要含水层系统不是区域性的，而是由裂缝和风化带控制的。因此，强烈设想将在相干岩区域（在新鲜基岩和砾岩之间的破裂和风化带）与地下水相交，深度为80-100 m。也，