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Book Reviews by Oyekan Hammed
The Very Low Frequency Electromagnetic (VLF-EM) method, which enables surveying without contact w... more The Very Low Frequency Electromagnetic (VLF-EM) method, which enables surveying without contact with the ground, is suitable for ground surveys in a wide area and has been used in mapping geology and in mineral exploration for decades. The technique makes use of signal radiation from military navigation radio transmitters operating in the frequency range of 15-30 kHz. When the electromagnetic wave impinges on the surface it is both reflected back into the air and refracted into the earth. By measuring the shifted reflected magnetic field relative to the primary field, subsurface structures can be constrained. Freely and readily available primary signals anywhere around the earth make the VLF method very convenient and efficient for field data collection. Further, VLF data processing using digital linear filtering is quite accurate and very efficient in depicting the qualitative information about subsurface conductors, even though quantitative interpretation of VLF data is as complex as other EM data interpretation. In this study, various aspect of VLF-EM method such as basic theory, worldwide VLF transmitters, and quantities measured and a case study review of the integrated geophysical exploration for sulphide minerals In the Wadi Sa'al area, south Sinai in Egypt (only the VLF-EM method used in this study were review).
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Drafts by Oyekan Hammed
This report describes the acquisition, processing, and results of the University of I... more 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 this area, electrical resistivity, weight drop seismic refraction method and very low frequency electromagnetic (VLF-EM) survey were carried out. This field session was meant to expose students to the hands-on application of the theory learned over the past several semesters. With the assistance of our lecturers and known-how-technicians, the data collected was made available to the students for the necessary processing and interpretation. The main objectives of surveying in this area (Share, Tsaragi and Yikpata) was to properly delineate the geological boundary and to know the extent to which the geological layer overlapped each other, as intense geological mapping of this area by the students of the University of Ilorin and Kwara state University, coupled with a review of the literature published on the geology of the area confirmed the presence of unconformity in this area. Along with the secondary goals of characterizing stratigraphy and structural geology in the area.
The report is composed of 6 chapter, chapter one provide a detailed and comprehensive explanation on all the available and common geophysical method. Chapter two explain the geology of the study area from the review of the geological report carried out by the students of the University of Ilorin and tudents of Kwara state University. Instrumentation, data acquisition process and field methodology are explained in chapter three and the remaining three chapters explain the data processing and interpretation, a review of case history and conclusion and further recommendations on future field works were explained respectively.
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Papers by Oyekan Hammed
This report describes the acquisition, processing, and results of the University of Ilorin Depart... more 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 this area, electrical resistivity, weight drop seismic refraction method and very low frequency electromagnetic (VLF-EM) survey were carried out. This field session was meant to expose students to the hands-on application of the theory learned over the past several semesters. With the assistance of our lecturers and known-how-technicians, the data collected was made available to the students for the necessary processing and interpretation. The main objectives of surveying in this area (Share, Tsaragi and Yikpata) was to properly delineate the geological boundary and to know the extent to which the geological layer overlapped each other, as intense geological mapping of this area by the students of the University of Ilorin and Kwara state University, coupled with a review of the literature published on the geology of the area confirmed the presence of unconformity in this area. Along with the secondary goals of characterizing stratigraphy and structural geology in the area. The report is composed of 6 chapter, chapter one provide a detailed and comprehensive explanation on all the available and common geophysical method. Chapter two explain the geology of the study area from the review of the geological report carried out by the students of the University of Ilorin and tudents of Kwara state University. Instrumentation, data acquisition process and field methodology are explained in chapter three and the remaining three chapters explain the data processing and interpretation, a review of case history and conclusion and further recommendations on future field works were explained respectively.
Bookmarks Related papers MentionsView impact
The Very Low Frequency Electromagnetic (VLF-EM) method, which enables surveying without contact w... more The Very Low Frequency Electromagnetic (VLF-EM) method, which enables surveying without contact with the ground, is suitable for ground surveys in a wide area and has been used in mapping geology and in mineral exploration for decades. The technique makes use of signal radiation from military navigation radio transmitters operating in the frequency range of 15-30 kHz. When the electromagnetic wave impinges on the surface it is both reflected back into the air and refracted into the earth. By measuring the shifted reflected magnetic field relative to the primary field, subsurface structures can be constrained. Freely and readily available primary signals anywhere around the earth make the VLF method very convenient and efficient for field data collection. Further, VLF data processing using digital linear filtering is quite accurate and very efficient in depicting the qualitative information about subsurface conductors, even though quantitative interpretation of VLF data is as complex as other EM data interpretation. In this study, various aspect of VLF-EM method such as basic theory, worldwide VLF transmitters, and quantities measured and a case study review of the integrated geophysical exploration for sulphide minerals In the Wadi Sa'al area, south Sinai in Egypt (only the VLF-EM method used in this study were review).
Bookmarks Related papers MentionsView impact
This report describes the acquisition, processing, and results of the University of I... more 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 this area, electrical resistivity, weight drop seismic refraction method and very low frequency electromagnetic (VLF-EM) survey were carried out. This field session was meant to expose students to the hands-on application of the theory learned over the past several semesters. With the assistance of our lecturers and known-how-technicians, the data collected was made available to the students for the necessary processing and interpretation. The main objectives of surveying in this area (Share, Tsaragi and Yikpata) was to properly delineate the geological boundary and to know the extent to which the geological layer overlapped each other, as intense geological mapping of this area by the students of the University of Ilorin and Kwara state University, coupled with a review of the literature published on the geology of the area confirmed the presence of unconformity in this area. Along with the secondary goals of characterizing stratigraphy and structural geology in the area.
The report is composed of 6 chapter, chapter one provide a detailed and comprehensive explanation on all the available and common geophysical method. Chapter two explain the geology of the study area from the review of the geological report carried out by the students of the University of Ilorin and tudents of Kwara state University. Instrumentation, data acquisition process and field methodology are explained in chapter three and the remaining three chapters explain the data processing and interpretation, a review of case history and conclusion and further recommendations on future field works were explained respectively.
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This report describes the acquisition, processing, and results of the University of Ilorin Depart... more 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 this area, electrical resistivity, weight drop seismic refraction method and very low frequency electromagnetic (VLF-EM) survey were carried out. This field session was meant to expose students to the hands-on application of the theory learned over the past several semesters. With the assistance of our lecturers and known-how-technicians, the data collected was made available to the students for the necessary processing and interpretation. The main objectives of surveying in this area (Share, Tsaragi and Yikpata) was to properly delineate the geological boundary and to know the extent to which the geological layer overlapped each other, as intense geological mapping of this area by the students of the University of Ilorin and Kwara state University, coupled with a review of the literature published on the geology of the area confirmed the presence of unconformity in this area. Along with the secondary goals of characterizing stratigraphy and structural geology in the area. The report is composed of 6 chapter, chapter one provide a detailed and comprehensive explanation on all the available and common geophysical method. Chapter two explain the geology of the study area from the review of the geological report carried out by the students of the University of Ilorin and tudents of Kwara state University. Instrumentation, data acquisition process and field methodology are explained in chapter three and the remaining three chapters explain the data processing and interpretation, a review of case history and conclusion and further recommendations on future field works were explained respectively.
Bookmarks Related papers MentionsView impact