ABSTRACT Integrated aerogeophysical datasets (aeromagnetic and airborne radiometric) were used for the litho-structural and depth characterisation and to assess the environmental radiation risks in part of Igarra, southwestern Nigeria. The total magnetic intensity (TMI) reduced to the magnetic equator gridded data were enhanced using first vertical derivative, analytic signal, tilt derivative, and spectral and Euler deconvolution analyses to improve and enhance the subsurface rocks’ textura...
ABSTRACT The research project was carried out to study the estimations of interval velocity from seismic reflection data of the acoustic P waves inside the Earth using the method of time migration which is necessary for obtaining seismic images in regular Cartesian coordinates. The main goals of the research work were to develop algorithms to convert time-migration velocities to true seismic velocities, and to convert time-migrated images to depth images in regular Cartesian coordinates. The...
This report describes the acquisition, processing, and results of the University of Ilorin Department of Geophysics 2019 Summer Field Camp. From 4th of April through 7th of April, a team of undergraduate students from the University of Ilorin, along with lecturers and department technicians conducted a series of geophysical surveys at Share, Tsaragi and Yikpata area in Kwara state. In...
ABSTRACT Qualitative Petrophysical Analysis of Wabi 10 well, located in the Wabi Oil Field in the Niger Delta was carried out. The wire-line log comprising of gamma rays, resistivity and neutron – density logs provided by Total Exploration and Production Nigeria Limited (TEPNL) was used. The properties considered include Lithofacies, the Permeable and Impermeable beds with their b...
Abstract Schlumberger array is the most commonly used among other arrays for Vertical Electrical Sounding (VES) and it requires large spacing at both ends for deeper subsurface information. The problem of limited space for spreading in built up areas could lead to incomplete information from deeper depth. The Geolectrical survey involving electrical resistivity methods has been carried out at Birnin Kebbi and Fakai Local Government Area in Northern Nigeria with the view to delineate ...
Electromagnetic Distance Measurement (EDM) equipment is calibrated on a base to determine instrument constants and errors. A series of measurements on a base can also be used to check the performance and reliability of the instrument over time and to assess its precision against the manufacturer's specifications. This research work, the establishment of Electromagnetic Distance Measurement (EDM) calibration base entails the setting up of a functional base where calibration of electr...
Abstract—An integrated approach involving Electrical Resistivity Tomography (ERT), Vertical Electrical Sounding (VES), and Very Low FrequencyElectromagnetic (VLF-EM) methods has been used to map the concentration and pathway of leachates plumes beneath Laka dump site in OgbomosoSouthwestern Nigeria. In-situ analysis, specifically, Electrical Conductivity (EC) and Total Dissolved Solids (TDS) were also carried out on water samplescollected from hand dug wells, bore holes and stream around th...
ABSTRACT This study is aimed at using the characteristics of polluted soil to delineate different soil layers and deduce ways of providing remediation to the problems generated as a result of soil pollution using Electrical Resistivity Method. An inversion of the measured apparent resistivity values using a computer program was carried out to determine the true subsurface resistivity. This method was used to estimate the lateral and vertical extend to which a particular soil has been conta...
ABSTRACT This study reviews earthquake monitoring and sensing in Nigeria. The techniques used to monitor earthquakes include seismic, Global position system (GPS) and remote sensing methods. For now there is no scientific method of predicting earthquakes, but seismologists depend on the anomalous animal behaviour, radon emissions, trends, creep fault, drop/rise in the water level and anomalous plant behaviour for earthquake prediction. The study also revealed that Nigeria is not seismically f...
ABSTRACT This research assesses the various factors responsible for road failures in the southwestern and south-southern parts of Nigeria with the aim of reporting findings to the public domain. The research further stressed the importance and relevance of geophysics in evaluating civil engineering structures such as roads. The above goals were met by studying the results of surveys carried out by researchers in southern Nigeria. Electrical Resistivity and Electromagnetic methods have been us...
The aim of this work is to describe various form and sources of electromagnetic radiation and its effect on earth. INTRODUCTION Electromagnetic radiation (EM radiation or EMR) is a fundamental phenomenon of electromagnetism, behaving as waves and also as particles called photons which travel through space carrying radiant energy. In a vacuum, it propagates at the speed of light, normally in straight lines. EMR is emitted and absorbed by charged particles. As an electromagnetic wave, it has b...