Near Surface Characterisation of Some Parts of Ago Iwoye Using Magnetic Method

Near Surface characterization of some part of Ago-Iwoye was carried out using gravity method with the aim of evaluating the magnetic depth variation to basement rock and geologic structures or lineament.
Magnetic data survey was done using a Magnetometer on a lateral and horizontal spacing, starting at a base point and intervals of 10m. The coordinate of each point is gotten with the aid of a digital GPS. The magnetometer has a compass which shows the north direction. In other to avoid error reading, metals and magnetic conducting substance were made away to avoid error in reading. The magnetic processing was done using OASIS montaj Viewer and USGS programs, which shows Total Magnetics Intensity (TMI), Reduction to Magnetic Equator (RTE), Source Parameter Imaging (SPI), Analytic Signal (AS) and Total Horizontal Derivative (THDR).
From the magnetic result based on the specific objectives, there are geologic lineament obtained within the area that trends NW-SE, NE-SW and EW-NS. The SPI showed variation to the magnetics basement within the area. These areas are associated with low magnetic and high magnetics basement. The result its amplitude ranges from -541.3nT to 493.4nT. However, this map has been overshadowed by the effects of the regional magnetic field and the non-zero magnetic tilt (I = 10.20). The results of the RTE operator show that the amplitude of the magnetic intensity ranges from -353.2 nT to 488.3 nT. The map shows varied magnetic intensity within the study area.
In conclusion, the magnetics method has been able to show that the study is associated with magnetics lineament or geologic lineament, their orientation and the variation to the magnetic basement within the area using gravity method.