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Depth Estimation of Geothermal Heat Structures by Euler Deconvolution of Gravity Data at Eburru Area, Kenya

Journal of Geoscience and Environment Protection 2020年第3期8卷 148-158页

作者： erick rayora nyakundi John Githiri Maurice K’Orowe Department of Physics Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya

Gravity survey was done at the Eburru area to estimate the source depth locations and delineate the fault boundaries using 3D Euler deconvolution. Gravity data was collected using CG-5 gravimeter. Gravity data reductions were done by applying drift correction, latitude correction, free air correction, Bouguer correction and terrain correction to the observed raw data to obtain complete bouguer anomaly (CBA). The CBA data was transferred to Oasis montaj software for Euler deconvolution processing. The 3D Euler deconvolution was carried out to determine and estimate the depth of the density bodies. Euler deconvolution locates the gravity anomaly source and estimates its depth from the gravity observation level. Euler deconvolution was preferred to other filtering methods in this study as solutions are only determined over identified analytic signal peaks, the window size varies according to anomaly size and the final solution involves only a few more precise depth estimates. The Euler deconvolution was performed using structural indices of 0.5, 1.0 and 2.0. Results from this analysis indicated that the CBA values in this study area range from gravity values of -272 mGal to -286 mGal and residual Bouguer anomaly amplitude range between -3 mGal and 3.4 mGal. The 0.5, 1.0 and 2.0 structural indices generated five solutions at depth range of 433 m - 2269 m, 801 m - 1433 m and 1170 m - 2246 m respectively occurring almost at the same locations on gravity highs. The deep structures were observed to occur in the northern part of the study area, and interpreted to be dense intruding masses likely to be trapped by the overlying cap rock at these depths. These could be geothermal heat sources that can be exploited to generate geothermal energy.

关键词： Euler Deconvolution Source Depth Structural Index Gravity Data Bouguer Anomaly Geothermal Heat Source

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Simultaneous Modelling of Gravity and Magnetic Data in a Measured Heat Flux Area to Characterize Geothermal Heat Sources: A Case for Eburru Geothermal Complex, Kenya

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Journal of Geoscience and Environment Protection 2021年第5期9卷 40-54页

作者： erick rayora nyakundi Githiri J. Gitonga Maurice O. K’Orowe Department of Physics Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya

Forward modelling of gravity and magnetic data was done simultaneously to show the correlation between gravity and magnetic anomalies on a measured heat flux region. The results were used to characterize the heat source structures in Eburru area. Modelling was done using Oasis montaj geosoft software which is an iteration process where the gravity and magnetic anomalies were calculated and compared to the observed residual anomaly until there was a fit. The start model was constructed based on depths from Euler deconvolution and models constrained using stratigraphy data from the existing wells in the study area. Forward modelling of gravity and magnetic data revealed intrusions within the Earth’s subsurface with depth to the top of the sources ranging from 739 m to 5811 m. The density of the sources ranges between 3.0 g/cm3 and

关键词： Forward Modelling Gravity Anomaly Magnetic Anomaly Heat Source Heat Flux Geothermal Gradient Eburru

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Quality Issues in the Expansion of University Education in Kenya, the Human Resource Challenges and Opportunities

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Chinese Business Review 2012年第6期11卷 596-605页

作者： Charles Kombo Okioga erick nyakundi Onsongo Yobes Benjamin Nyaboga Kisii University College Kisii Kenya

This paper gives an analysis of the quality issues in the expansion of university education in Kenya examining the human resource challenges and opportunities. It examines a variety of factors that impact the nature, content, and mode of delivery of the teaching. The paper is an introduction and highlights the importance of higher education to societal development. It observes that higher education enables individuals to develop their capabilities to the highest potential, serves the needs of an adaptive, sustainable and knowledge based economy and plays a major role in shaping a democratic, civilized and inclusive society. It is thus seen as the key to progress in the 21 st century. It examines government policy with respect to education in general and higher education in particular. It is noted that the government recognizes the important role that education plays to foster national development and has therefore through various policy instruments sought to ensure that access, relevance, and quality become the major areas of the development of higher education in the country. The management of the universities in the country has faced serious human resource challenges. These challenges arise from the fact that the rapid expansion of university education in the country has not been accompanied with provision of resources in order to maintain high standards, quality, and relevance. This in turn has negatively affected the quality and relevance of the programmes. It is recommended that in order to enhance the quality of teaching, research, and service delivery.

关键词： higher education research expansion

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