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In this work, the surface ground motion that occurs during an earthquake inground sections having different topographic forms has been examined with oneand two dynamic site response analyses. One-dimensional analyses wereundertaken using the Equivalent-Linear Earthquake Response Analysis (EERA)program based on the equivalent linear analysis principle and the Deepsoilprogram which is able to make both equivalent linear and nonlinear analysesand two-dimensional analyses using the Plaxis 8.2 software. The viscousdamping parameters used in the dynamic site response analyses undertaken withthe Plaxis 8.2 software were obtained using the DeepSoil program. In thedynamic site response analyses, the synthetic acceleration over a 475-yearreturn period representing the earthquakes in Istanbul was used as the basisof the bedrock ground motion. The peak ground acceleration obtained differentdepths of soils and acceleration spectrum values have been compared. Thesurface topography and layer boundaries in the 5-5' cross section whichcuts across the study area west to east were selected in order to examine theeffect of the land topography and layer boundaries on the analysis results,and were flattened and compared with the actual status. The analysis resultsshowed that the characteristics of the surface ground motion change inrelation to the varying local soil conditions and land topography

natural hazards and earth system sciences

Investigating the influence of topographic irregularities and two-dimensional effects on surface ground motion intensity with one- and two-dimensional analyses