Integrated Geophysical Methods For Investigations Of The Ayat Real Estate Foundation An Implication For Engineering Work Suitablity Northeastern Addis Ababa

An integrated geophysical investigation was carried out at a site near Yeka-Ayat condominium and just in area about the middle of Ayat square and Tafo square, northeastern Addis Ababa, Ethiopia. The principal objective of this research is to map the subsurface geology of the site and discuss its suitability for the construction of large infrastructure. The method employed are the electrical resistivity tomography Vertical Electrical Sounding (VES) and Seismic refraction. Four VES points distributed along one profile line, four dipole-dipole survey lines spread and seismic survey on two profile lines were conducted to characterize the foundation materials within the study site. Qualitative and quantitative interpretations of the acquired data were made by comparing the results with borehole log data available from nearby areas. The results have revealed that the subsurface geology consists of three to four distinct units that reflect different physical properties (resistivity and seismic wave velocity). The upper most layer is characterized by low resistivity (3.03-25Ω-m) and low P-wave velocity (

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