TY  - JOUR
T1  - Spectral Analysis and Modeling of Magnetic Anomalies in Part of Northern Anambra Basin,
Nigeria
AU - N. Obiora, Daniel AU - C. Okorie, Alexius 
JO  - Environmental Research Journal
VL  - 14
IS  - 3
SP  - 84
EP  - 96
PY  - 2020
DA  - 2001/08/19
SN  - 1994-5396
DO  - erj.2020.84.96
UR  - https://makhillpublications.co/view-article.php?doi=erj.2020.84.96
KW  - susceptibility values
KW  -forward and inverse modeling
KW  -spectral analysis
KW  -Aeromagnetic data
KW  -northern Anambra basin
AB  - 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.
ER  -