The Role of Soil Amplification Studies in Seismic Hazard Assessment in Some Selected Parts of Adama Town, Central Ethiopia
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Date
2016-06
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Addis Ababa Universty
Abstract
Seismic hazard is one of the most destructive natural phenomena in the world as well as in our
country. Subsurface conditions play a major role in the damage potential due to earthquake and
seismic soil amplification of a site. The average shear wave velocity of the soil in the top 30 m
layer is an essential parameter controlling the amplification behavior of a site. The present study
was conducted in some selected parts of Adama town mostly in the northeastern and eastern part.
The work was conducted to estimate soil Amplification and its role in seismic hazard assessment
as well as the determination of the relevant parameters of site period and the average shear wave
velocity to 30m depth(Vs30). Controlled source Seismic data was collected at 19 sites and
analyses of seismic refraction and multi-channel surface waves data were conducted to examine
the P- and S-wave characteristics of the subsurface. Depths to the bedrock and geological
structures, average shear wave velocity to a depth of 30m, site periods and amplification factor
values were calculated. Maps and graphs were produced to show spatial distribution of the
various parameters. The research results suggest that the study area is under considerable danger
of soil amplification.
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Hazard