Authors : Daniel N. Obiora and Alexius C. Okorie
Abstract: Spectral analysis and modeling (forward and inverse) methods were employed in the geophysical investigation of Ubiaja and Illushi areas through the interpretation of aeromagnetic data. The purpose is to determine the depth to magnetic anomalies and possible cause of the anomalies in Ubiaja and Illushi areas which are located in the Northern Anambra basin. The spectral analysis reveals two prominent magnetic layers (the deep and shallow depth layers). The depth to deep layers ranges from 1114.087-3978.874 m with an average depth valueof 2105.014 m while the depth to shallow layers ranges from 163.836-460.057 m with an average depth value of 295.708 m. The depth results from forward and inverse modeling for profiles 1-4 were 4118, 3611, 2964 m and 5489 m, respectively. The susceptibility values obtained for profiles 1 and 2 were 0.0100 which is associated with a group of minerals such as gneiss, hematite, granite or gabbro. Profile 3 with susceptibility value of 0.0613 is typical of igneous rock porphyry while profile 4 with susceptibility value of 0.0288 is typical with minerals like slate and hematite.
Daniel N. Obiora and Alexius C. Okorie, 2020. Spectral Analysis and Modeling of Magnetic Anomalies in Part of Northern Anambra Basin, Nigeria. Environmental Research Journal, 14: 84-96.