Determination of Curie Depth Isotherm and Geothermal Studies over Parts of Nasarawa and Environs, North Central Nigeria
Rowland Akuzigi Ayuba,
Ahmed Nur
Issue:
Volume 3, Issue 4, July 2018
Pages:
69-81
Received:
23 April 2018
Accepted:
17 May 2018
Published:
25 September 2018
Abstract: The high resolution aeromagnetic data was analyzed to estimate depths to the bottom of magnetic sources as proxy information about the thermal conditions within the crust in Nasarawa area. This area is particularly important for geothermal exploration because of its high heat flow and geothermal gradients. The result of this investigation revealed that Curie point depth vary between 18km and 23km with deeper Isotherm at the northwestern part and shallow Isotherm at the south eastern part, this means that the Curie Isotherm surface around Awe Dorowa and Akiri may likely coincide with the Moho, these variations of curie depth isotherm could be related to the different tectonic activities, which involve astenospheric updoming, crustal thinning and stretching, emplacement of igneous bodies and block faulting in the Benue Trough. The calculated heat flow varies between 63 mWm-2- 80 mWm-2 and geothermal gradient varies between 25°C/km- 32°C/km. The south eastern part is characterized by high heat flow (80mW/m2), and shallow Curie depth (18 km), due to the geothermic nature of the area, the heat due to magmatic activities as well as heat from thinning of the crust is responsible for raising the temperature in these areas. The north western portion of the studied area has lower heat flow (63mW/m2) and deeper Curie depth (23 km) due to Isostacy. Variations in the Curie Depth compare reasonably well with the heat flow and with the Geothermal Gradient, this study also revealed that the south eastern part of the study area has potentials for geothermal energy.
Abstract: The high resolution aeromagnetic data was analyzed to estimate depths to the bottom of magnetic sources as proxy information about the thermal conditions within the crust in Nasarawa area. This area is particularly important for geothermal exploration because of its high heat flow and geothermal gradients. The result of this investigation revealed ...
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The Requisite to Avoid Risk of Probable Building Collapse in Nigeria
Issue:
Volume 3, Issue 4, July 2018
Pages:
82-88
Received:
21 January 2018
Accepted:
14 September 2018
Published:
17 October 2018
Abstract: Construction activities in Nigeria have made the industry a focal risk point. This is because several building collapses which has resulted into huge losses of properties and human lives are yet to be curtailed. Some authors have written on this issue but it was observed that the spontaneous collapse of buildings in different locations has not yet triggered expected regulatory review in Nigeria. There are several reported and unreported total and partial collapse of buildings in major Nigerian cities like Lagos, Abuja, Onitsha, Kano and Port Harcourt, etc. Despite the availability of reliable building codes widely used in design; construction industry in Nigeria is still failing to meet acceptable standards; thus, resulting into risk of structural defects and subsequent building collapse. To find lasting solutions to tackling the challenges, this paper examines risk factors responsible for building collapse and its impact on Nigerian economy. Questionnaire and interview were used as instruments of data collection. The data gotten were analysis using tools like spearman’s ranking and T-test. The findings revealed that usage of unapproved materials; defective design and engagement of quacks as major construction operators are the top ranked factors with an overall mean of 4.12, 3.96 and 3.87 respectively. T-test also reveals that at 95% confidence level, all the assessed factors were significant, as a significant p-value of 5 was derived for all the assessed factors. Loss of materials and capital investments, Psychological trauma and creating damaged image to the country and loss of lives of RII of 0.87, 0.85 and 0.83 were highest rankings respectively as identified impact of building collapse in Nigeria. It was concluded that all the identified factors are all significant and their impact are significant on the live of the people, the economy and the country’s image. Mitigation measures were proffered to curb its further re-occurrence or control.
Abstract: Construction activities in Nigeria have made the industry a focal risk point. This is because several building collapses which has resulted into huge losses of properties and human lives are yet to be curtailed. Some authors have written on this issue but it was observed that the spontaneous collapse of buildings in different locations has not yet ...
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