Browsing by Author "Tarfa, Kaleb"

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    Gis-Based Earthquake Effect Vulnerability Assessment of Built-Up Environment, in Case of Addis Ababa City, Ethiopia
    (Addis Ababa University, 2020-06-06) Tarfa, Kaleb
    The main issue in Earthquake effect vulnerability assessment is identifying all causative factors directly or indirectly related to risk of Earthquake to builtup environment. Earthquake risk vulnerability assessment plays a key role in risk mitigation efforts and seismic emergency planning, especially for urban areas with a high population density and a complex construction. Even though Studies on seismicity of the study area have been compiled by different researchers, A GIS-based seismic vulnerability assessment was not prepared for the city under investigation. To address this issue, an integrated approach of AHP method and GIS technology was presented and applied for Addis Ababa city for seismic effect vulnerability assessment. First earthquake input factors such as: geology, soil, slope, road networks, drainage density, shear velocity at 30m, lineaments and borehole depth are selected. All of these layers are brought to GIS environment to be given a weight by AHP. Then vulnerability index were prepared and applied to the study area. Finally, Earthquake effect suscestiplity map was prepared by overlaying all vulnerability indexes and accuracy was validated. The result indicated that AHP method and GIS technology could achieve the accurate and desired object while developing seismic vulnerability. The seismic vulnerability map of Addis Ababa was classified as: Very high, High, medium, low and Very low having an aerial extent of 30.34 ,Km2 71.74km2, 97.36 km2, and 219.34km2 and, 108.46 Km2respectively. The present study is used to identify earthquake vulnerable zones and serve as a base in earthquake effect mitigation and reduction strategy for the city.