An Investigation into the Ground Motion Amplification Potential of Selected Sites of Addis Ababa City
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Date
2018-07
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Publisher
AAU
Abstract
Located on the western margin of the Main Ethiopian Rift, Addis Ababa, the capital city
of Ethiopia, has experienced a number of earthquakes since its establishment. Thick soil
formations which are predicted to have an effect on ground motion parameters
characterize portions of the city. This site effect is even more significant considering the
fact that the city is located in a region characterized by moderate seismicity. A
one-dimensional ground response analysis using equivalent linear method was conducted
to investigate the influence of selected sites on input ground motions. Input soil data
were acquired from geotechnical investigation reports and seismic refraction surveys to
characterize the soil profile of the selected sites. By considering the geologic and
tectonic conditions of the vicinity, input ground motions were selected from PEER
ground motion database. Ground motions of unique parameters that are customarily used
in engineering practices were also included. Ground response analyses were performed
employing the input soil data to the DEEPSOIL program subjected to the selected input
ground motions at the base of the soil profile. The outcomes of the analyses show that
the selected sites have significant potential of amplifying the ground motions. This
amplification effect is observed to be exceedingly higher than the up-to-date
code-specified predictions. Therefore, the study suggests that it would be worth
investigating further in order to come up with more comprehensive study.
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Keywords
Ground Motion, Addis Ababa City, Amplification, Ethiopian Rift