NDLI: Application of geoelectrical resistivity imaging and VLF-EM for subsurface characterization in a sedimentary terrain, Southwestern Nigeria

Content Provider	Springer Nature Link
Author	Aizebeokhai, Ahzegbobor P. Oyeyemi, Kehinde D.
Copyright Year	2014
Abstract	Geoelectrical resistivity imaging and very-low frequency electromagnetic (VLF-EM) geophysical techniques were integrated to characterize the subsurface as part of preliminary investigations for groundwater resource assessment, development, and management in a sedimentary terrain, southwestern Nigeria. Six parallel 2D geoelectrical resistivity field data were collected using Wenner array; the VLF-EM data were equally collected along the same traverses. In addition, four vertical electrical soundings (VES) were conducted on the site using Schlumberger array to provide layering information. The plots of filtered in-phase and quadrature components of the VLF-EM data as well as their corresponding Fraser and Karous-Hjelt pseudo-sections are presented. The observed apparent resistivity data for the 2D traverses were inverted to produce 2D inverse model resistivity and then collated to 3D data set, which was inverted to obtain 3D inverse model resistivity of the subsurface. Iso-resistivity surfaces for 750, 1,000, and 1,500 Ωm extracted from the 3D inverse model show the 3D distribution of these resistivities. High-resistivity layer at depth range of 10.2–16.4 m and thickness ranging from 11.0 to 21.0, which overly the aquifer unit, delineated in the VES and 2D/3D resistivity models could not be distinctly discriminated in the Fraser and Karous-Hjelt pseudo-sections of the VLF-EM data. However, some conductive linear anomalies thought to be fissures or joints, which could serve as the main conduit path for groundwater recharge, were delineated in the Fraser and Karous-Hjelt pseudo sections. Thus, the use of geoelectrical resistivity or VLF-EM technique alone is inadequate to characterize the subsurface features in the study site; consequently, the integration of 2D and 3D resistivity imaging with VLF-EM technique enhanced the degree of reliability of the subsurface characterization in the study site.
Starting Page	4083
Ending Page	4099
Page Count	17
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	8
Issue Number	6
e-ISSN	18667538
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-06-26
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Resistivity imaging VLF-EM 3D inversion Parallel 2D profiles Near-surface characterization Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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