Browsing by Author "Goki, N.G."

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    COMPACTION CHARACTERISTICS CURVES OF SOILS IN NASSARAWA – EGGON TOWN AND ENVIRONS, CENTRAL NIGERIA.
    (Department of Geology and Mining, Nasarawa State University Keffi, 2020-06-21) Umbugadu, A. A.; Goki, N.G.; Kana, A.A.; Usman, Halima Osu
    The study was conducted to study the complication arising from compaction curves of soils in Nassarawa – Eggon, North – Central Nigeria. Twenty representative samples were studied and the British Standard 1377 methods of sampling and analysis were employed for the grain size distribution and compaction. The soils are predominantly silty sand. Values of the optimum moisture content range from 10.0 g/cm3 – 34.5 g/cm3 while the maximum dry density values range from 1.61% to 1.88%. The compaction pattern can be noticed from samples AUS 14 to AUS 20 that the maximum dry density decreases because of the nature of the soil, being a boundary between the basement and sedimentary. The investigation has established two types of compaction curves: the single regular peaks and the irregular peaks, signifying the degree of compaction and nature of the soils.. There is a correlation between the soil index properties; water content and dry density on the kind of curves.
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    Kwoi 2016 Multiple Tremors: An Emerging Geotourism Phenomenon
    (Department of Geology and Minning, Nasarawa State University Keffi, 2017-01-01) Goki, N.G.; Baba, Adama Oleka; Iyakwari, Shekwoyandu; Tanko, I.Y.; Kana, A.A.; Umbugadu, A.A.; Usman, Halima Osu
    For a stretch of three days, the residents of Kwoi, Central Nigeria were held hostage by what is now accepted as an earth tremor of magnitudes ranging between 2.9 and 3.1. In its initial stages, various versions of interpretations were given including religious and traditional myths. These triggered national and international attention making the area to be temporarily a tourist’s attraction of some sorts with different groups visiting and reporting different versions. The aim of this paper is to report first hand the occurrence of systematic cracks on rocks and buildings as well as the safety aspects associated with this tremor. The study confirms that this is a purely geoscientific phenomena triggered by deep seated tectonic movements manifested on the surface through short distance travel of the accompanying vibrations which lead to collapse and breakage of buildings. It is unpredictably episodic but relatively safe for tourists as an intra-cratonic tremor.
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    Subsurface Structural Characterization of Filatan Area A, Zaria – Kano Road, using the 2D Electrical Resistivity Tomography
    (Department of Physics, Nasarawa State University Keffi, 2013-01-14) Fadele, S.I.; Jatau, B.S.; Goki, N.G.
    The method adopted for this paper was the 2D Electrical Resistivity Tomography (ERT), using the ABEM LUND Imaging System. A Wenner configuration WEN32SX was carried out to map the electrical properties as an aid to characterizing the subsurface conditions around Filatan area, Zaria aimed at determining the depth to the competent stratum in the subsurface and delineation of areas that are prone to subsidence or some form of instability, study the groundwater potential with a view of determining the depth to the bedrock and thickness of the overburden and probable depth of sewage system. Four profiles were occupied in the study area. For each profile, the layout geometry for the electrical imaging was such that two reels of cables were used with 5m intervals between the takeout electrodes. However, the two innermost electrodes adjoining the two reels of cables were connected together thus yielding a total of 41 electrodes and a spread length of 200m. The data obtained using ABEM Terrameter SAS 4000 were processed using RES2DIVN software. Based on the electrical images obtained in the study area, the following deductions were made. The depth to the fresh basement is generally well beyond 30.0m. The study reveals the presence of three to four distinct layers respectively; the topsoil, weathered basement/partly weathered basement and fresh basement with resistivity values ranging from 28 – 95Ωm for topsoil, 95 – 276Ωm for weathered basement, 97 – 815Ωm for partly weathered basement and as high as 2435Ωm for the bedrock (fresh basement). These layers constitute the overburden with a thickness of 29.3m revealed by the pseudosections. The topsoil composed of laterite and brownish sandy clay with an average thickness of 11.0m, which are indications of soil conditions requiring serious consideration in the design of massive engineering structures because of their low load-bearing capacity. The weathered basement underlies the topsoil with an average thickness of 18.3.0m and this is a good aquifer in the study area. The depth of sewage system in this area should not exceed 10m to avoid groundwater contamination since the entire area is shallow to the aquifferrous zone.