Why Choose Us?
Geotruth Consult prides itself in studying, analysing and presenting high confidence field data that aids actionable decision making. By integrating geologic, hydrologic, remote sensing, satellite and geophysical data collected by either or a combination of various complementing geophysical technologies, we provide the most accurate scientific analysis with a greater than 99% accuracy. We are the only firm in Kenya with vast experience and skillset in conducting the Electrokinetic Survey method whose degree of efficacy is greater than 99%, making it the most useful technique in groundwater assessment and aquifer characterisation.
No single project will have an exact outcome. As such, we understand that different environmental settings will pose different challenges to the project implementation. Thus, we employ specific or a combination of geophysical techniques to study a site for more accurate and actionable deductions. Hence, below are the geophysical techniques we employ at GeoTruth consult.
1. The Electroseismic (EKS) Method
The Electroseismic method also known as the Electrokinetic Survey (EKS) method is related to the commonly known phenomenon called streaming potential, where flowing subsurface water produces a voltage measurable on the ground surface. A more distant relative of the method are thunderstorms where rapidly rising air produces electrical charge separations, thus creating large potential differences. The ES technique makes use of the fact that seismic and electromagnetic (EM) energies are generally coupled in wetted porous rocks. With these techniques the earth is seismically excited and an electromagnetic response is measured. The ES technique employed at GeoTruth Consult is in itself a combination of multiple active and passive geophysical technologies. These are Magnetotellurics (MT), Electrotellurics (ET), Resistivity, Electromagnetic (EM) and Seismic methods. Hence, the EKS method, based on the conversion of seismic energy to electromagnetic energy in deformable, fluid-filled, porous rocks, does not only depend on the rock properties but also on the actual pore fluid.
2. The Resistivity Method
The resistivity method is used to map the subsurface electrical conductivity distribution of the area under investigation. From the conductivity information, inferences regarding the subsurface geology are made and geological structures are mapped. Thus, weathered zones containing groundwater will in some instances produce large enough conductivity contrasts to allow direct detection by means of the resistivity method.
Hence, the resistivity method works by the principle that less weathered, fresh and dry lithologies will have higher resistivities while more saturated (wet), weathered materials will have low resistivities.
However, the resistivity method suffers the equivalence problem where clayey materials and more conductive minerals in rocks may easily be interpreted as rich aquifers during groundwater studies.