The Role Of Soil Amplification Studies In Seismic Hazard Assessment In Some Selected Parts Of Adama Town Central Ethiopia

Seismic hazard is one of the most destructive natural phenomena in the world as well as in ourrncountry. Subsurface conditions play a major role in the damage potential due to earthquake andrnseismic soil amplification of a site. The average shear wave velocity of the soil in the top 30 mrnlayer is an essential parameter controlling the amplification behavior of a site. The present studyrnwas conducted in some selected parts of Adama town mostly in the northeastern and eastern part.rnThe work was conducted to estimate soil Amplification and its role in seismic hazard assessmentrnas well as the determination of the relevant parameters of site period and the average shear wavernvelocity to 30m depth(Vs30). Controlled source Seismic data was collected at 19 sites andrnanalyses of seismic refraction and multi-channel surface waves data were conducted to examinernthe P- and S-wave characteristics of the subsurface. Depths to the bedrock and geologicalrnstructures, average shear wave velocity to a depth of 30m, site periods and amplification factorrnvalues were calculated. Maps and graphs were produced to show spatial distribution of thernvarious parameters. The research results suggest that the study area is under considerable dangerrnof soil amplification.

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