Generic site amplification factors for northwestern Türkiye and their use in ground motion simulations

Muratoğlu, Gamze
Earthquake ground motions are influenced by source, path and local site properties. Among these three factors, local site conditions have a great effect on ground shaking and thus the structural damages observed during large earthquakes. Soil layers on top of hard rock can amplify the ground motions, which makes it essential to quantify the site amplifications. In this thesis, generic site amplification factors in Northwestern Türkiye are obtained according to the NEHRP (National Earthquake Hazards Reduction Program) site classes for selected stations by following a 1-D site response analyses with an equivalent linear analysis method. A total of 76 shear wave velocity profiles are compiled with varying resolutions and depths. Strong and weak motion datasets are used as input bedrock ground motions throughout the analyses. Next, Gaussian functions are fitted to the generic site amplification data based on NEHRP site classes A, B, C and D. Comparisons of the developed amplification functions are made with available amplification factors in the literature for different regions. The amplification functions obtained from the 1-D site response analyses with strong and weak input motions show significant differences. Next, the proposed amplification factors are used as input to the stochastic ground motion simulations of the 1999 Düzce Earthquake. The simulated data at selected stations are compared to the corresponding real ground motions. Finally, the goodness-of-fit values are computed to demonstrate the variations between the simulated and recorded motions. This study constitutes the first attempt to develop and test generic site amplification functions for Türkiye, focusing on the Northwestern regions.


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Citation Formats
G. Muratoğlu, “Generic site amplification factors for northwestern Türkiye and their use in ground motion simulations,” M.S. - Master of Science, Middle East Technical University, 2022.