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This study is conducted to prepare seismic microzonation map to central part of Addis AbabarnCity. The basic method used is the observation and analysis of microtremors.rnThe first effort was made by Ayele (2001) based on 40 observation sites. Latter detailed studyrnwas initiated by dividing the city in to five parts namely the northeastern, northwestern,rncentral, southeastern and southwestern parts of which the central part is the study area for thisrnthesis.rnIn this thesis seismicity and related hazard for Addis Ababa city and its locality, historicrnrecords, geologic conditions and effects on earthquake, and the theoretical background used inrnpreparing microzonation maps are presented. The nature of microtremors, basicrncharacteristics and their use in estimating site-effects is also discussed together with thernmethod of measurement, equipments used and available tools to analyze collected data. Thernsuitability of microtremor based site-effect study has been tested by comparison of resultsrnwith solutions from one dimensional analytical model for selected sites.

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