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.


An Interdisciplinary Approach for Regional Seismic Damage Estimation
Askan Gündoğan, Ayşegül; Erberik, Murat Altuğ; Karim Zadeh Naghshineh, Shaghayegh; Yakut, Ahmet (2017-01-09)
In order to mitigate seismic risk in urban regions, the first task is to identify potential seismic losses in future earthquakes. Seismic loss estimation is an interdisciplinary framework including a wide range of contributions from geophysical and earthquake engineers, physical and economic planners to insurance companies. In this study, a moderate size city in Turkey, namely Erzincan, is modeled completely from geophysical attributes to the built environment. Erzincan city is on the eastern part of the No...
Evaluation of the site effects of the Ankara basin, Turkey
Kockar, M. K.; Akgün, Haluk (2012-08-01)
Recent major earthquakes have explicitly demonstrated that near-surface local site conditions that can generate significant amplifications and spatial variations of earthquake ground motion play a major role in the level of ground shaking and in gathering information on soft soil response. It is therefore highly desirable to develop methods to identify and characterize regions that are prone to this type of site amplification. To determine the subsurface sediment characteristics over a wide area, measuremen...
Yousefı Bavıl, Karım; Koçkar, Mustafa Kerem; Akgün, Haluk (null; 2017-10-13)
Seismic events in the last few decades have demonstrated that local site conditions particular near earthquake prone areas that can generate significant amplifications and spatial variations of earthquake ground motion play a major role in the level of ground shaking. Hence, the amplification of ground motion due to local site effects (i.e., topographical conditions, ground motion resonance and basin geometry, etc.) plays an important role in increasing seismic damage. The study area is located in the Gölya...
Dynamic soil characterization and site response estimation for Erbaa, Tokat (Turkey)
AKIN, MÜGE; Kramer, Steven L.; Topal, Tamer (2016-07-01)
Site amplification is one of the most important factors controlling damage in urban areas through strong earthquakes. Local site effects play an important role in earthquake-resistant design and should be considered for site response analyses. In this study, ground response analyses in Erbaa, Turkey, a settlement in the North Anatolian Fault Zone, using one-dimensional equivalent linear analysis and empirical approaches based on shear wave velocity profiles are evaluated and compared. The ground response an...
Hybrid-Empirical Ground Motion Estimations for Georgia
Tsereteli, Nino; Askan Gündoğan, Ayşegül; Hamzehloo, Hossein (2016-10-01)
Ground motion prediction equations are essential for several purposes ranging from seismic design and analysis to probabilistic seismic hazard assessment. In seismically active regions without sufficiently strong ground motion data to build empirical models, hybrid models become vital. Georgia does not have sufficiently strong ground motion data to build empirical models. In this study, we have applied the host-totarget method in two regions in Georgia with different source mechanisms. According to the tect...
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.