VERY LOW FREQUENCY ELECTROMAGNETIC SURVEY FOR SUBSURFACE CHARACTERIZATION WITHIN PART OF PHASE II, AHMADU BELLO UNIVERSITY, ZARIA, KADUNA STATE
Abstract
Lately, there has been an increase in the rate of structural failure in Nigeria and many parts of the world due to many reasons among which is subsurface inadequacy. This has led to loss of lives, properties, a lot of casualties and has become a critical problem that requires proper attention. Very low frequency (VLF) electromagnetic method was used for subsurface characterization within part of phase II, Ahmadu Bello University, Zaria, Kaduna State. VLF data were collected along fourteen (14) profiles covering an area of 84000m2 and measurements were made at 10m interval along each profile with profile length of 300m. The VLF data were collected using Terra-Plus VLF instrument and interpreted using KHFFILT software. The interpretation of VLF data using the Hjelt-Karous filter resulted in current density sections. The representative current density plots show the conductivity distribution of the subsurface. The current density variation was assumed to indicate the presence of fractures at the 14 stations of which profiles 7, 10 and 12 are not well fractured. The fractures identified are mostly oriented in the N-S direction of the study area
References
Alagbe O A, Sunmonu L A, Adabanija M A. (2013). Fracture Distribution Within Bowen University Permanent Site and Its Hydrogeologic Implication. Research Journal of Physical Sciences, Vol.1, no. 3, pp. 1-5.
Adelusi A. O., Akinlalu A. A. and Nwachukwu A. I. (2013). Integrated geophysical investigation for post-construction studies of buildings around School of Science area, Federal University of Technology, Akure, Southwestern, Nigeria. International Journal of Physical Sciences. Vol. 8, no. 15, pp. 657-669
Adagunodo T.A., Sunmonu L.A. and Oladejo O.P., (2014). Electromagnetic Investigation into the Cause(s) of Road Failure along Takie-Ikoyi Road, Ogbomoso. International Journal of Business and Applied Science. Vol.1, pp. 78-85.
Benson A.K., Payne K.L. & Stubben M. A. (1997). Map¬ping groundwater contamination using dc resistivity and VLF geophysical methods - A case study. Geo¬physics 62, 80-86.
George A.M., Abong A.A. and Obi D.A., (2013). Fracture Zone Detection Using Very Low Frequency (VLF) Electromagnetic Method in Parts of Oban Massif, South-Eastern Nigeria. Pelagia Research Library. Vol. 4, no. 6, pp. 104-121
Garba M.L., Yusuf Y.O, Arabi A.S., Musa S.K & Schoeneich K., (2014). An updated on the quality of water in Samaru stream, Zaria, Nigeria. Zaria Geographer, Vol.21, No.1, pp. 75-84
Google Earth 2018. Imagery Map, www.google.com/earth/
Karous M. & Hjelt S.E. (1983). Linear filtering of VLF dip-angle measurements. Geophys. Prospect. 31, 782-794.
McNeill, J. D., & Labson, V. F. (1991). Geological Mapping Using VLF Radio Fields. Electromagnetic Methods in Applied Geophysics pp. 521-640.
Monteiro Santos F A, Mateus A, Figueiras J and Goncalves M A (2006). Mapping groundwater contamination around a landfill facility using the VLF-EM method — a case study. Journal of Applied Geophysics 60(2):115-125
Oyawoye, P. O. 1964. Geology of Nigerian Basement Complex. Journal of Mining and Geology, Vol.1, P. 110-121
Oyedele K.F., Oladele S, Adedoyin O, (2011). Application of Geophysical and Geotechnical Methods to Site Characterization for Construction Purposes at Ikoyi, Lagos, Nigeria. J. Earth Sci. Geotech. Eng. 1(1):87-100.
Sundararajan N, Babu V R, Prasad N S and Srinivas Y 2006 VLFPROS—a matlab code for processing of VLF-EM data Co. Geo. 32 1806—1813
Sundararajan N., Nandakumar G., Narsimha M., Ramam K. y Srinivas Y. (2007). VES and VLF - An applica¬tion to groundwater exploration, Khammam, India. Leading Edge 26, 708-716.
Wright, J. B. and McCurry, P. (1970). The geology of Nigeria Sheet 102 SW, Zaria and its regions. Edited by M. J. Mortimore. Department of Geography, Occasional paper, No.4, Ahmadu Bello University, Zaria.
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