Soil Piping Analyses in Awka South Local Government Area of Anambra State, Nigeria using both Electromagnetic and Magnetic Geophysical Techniques

Chibuogwu I.U.¹ , Ugwu ² , G.Z. ³

Section:Research Paper, Product Type: Journal-Paper
Vol.9 , Issue.5 , pp.60-68, May-2023

Online published on May 31, 2023

Copyright © Chibuogwu I.U., Ugwu, G.Z. . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Among the many uses of the non-invasive geophysical techniques in studying the phenomena associated with tunnel erosions and soil pipings, the Very Low Frequency Electromagnetic (VLF-EM) and the magnetic techniques have witness little or no considerations. The reasons for these non-considerations have not been fully proven literally. Thus, this study will attempt to use VLF-EM and magnetic techniques to investigate the characteristic of the spatial distribution of soil pipes in an actively loose erosive soil at Awka, Anambra state, Nigeria that is geological located at (6.02220N and 7.0821E). The VLF-EM surveyed a profile length of 200m with an interstation spacing of 5m using an Abem Waldi VLF-EM meter. The magnetic surveyed was done with portable proton precision magnetometer, the survey was carried out on 9 different profiles with grid lines of 18, 2m x 2m squares. The VLF-EM results show that the subsurface of the study areas have unusual low conductivities ranging from -10mhos to 3mhos, which are very much different from the normal ground values. These unusual low conductivities have been interpreted as soil pipes as they almost coincides with the location of the soil pipes holes in the surface of the study areas. The result of the magnetic survey was achieved by using a diurnal corrected anomaly generated from the field. This shows that low magnetic susceptibility ranging from -124.4 to -300nT (taking the range of the two study areas) have been built up in the subsurface and are predominately in the southwestern region, where most of the soil pipes are located in the surveyed areas.

Key-Words / Index Term :
Soil piping, Soil subsidence, Geophysical technique, VLF- EM, Magnetic survey, Diurnal, Awka

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