Development of site specific vertical design spectrum for Turkey

Akyüz, Emre
Vertical design spectra may be developed in a probabilistic seismic hazard assessment (PSHA) by computing the hazard using vertical ground motion prediction equations (GMPEs), or using a vertical-to-horizontal spectral acceleration (V/H) ratio GMPEs to scale the horizontal spectrum that was developed using the results of horizontal component PSHA. The objective of this study is to provide GMPEs that are compatible with regional ground motion characteristics to perform both alternatives. GMPEs for the V/H ratio were developed recently by Gülerce and Abrahamson (2011) using NGA-W1 database. A strong motion dataset consistent with the V/H ratio model parameters is developed by including strong motion data from earthquakes occurred in Turkey with at least three recordings per earthquake. The compatibility of GA2011 V/H ratio model with the magnitude, distance, and site amplification scaling of Turkish ground motion dataset is evaluated by using inter-event and intra-event residual plots and necessary coefficients of the model is adjusted to reflect the regional characteristics. Analysis of the model performance in the recent moderate-tolarge magnitude earthquakes occurred in Turkey shows that the Turkey-Adjusted GA2011 model is a suitable candidate V/H ratio model for PSHA studies conducted in Turkey. Using the same dataset, a preliminary vertical ground motion prediction equation for Turkey consistent with the preliminary vertical model based on NGA-W1 dataset is developed. Proposed preliminary model is applicable to magnitudes 5-8.5, distances 0-200 km, and spectral periods of 0-10 seconds and offers an up-to-date alternative to the regional vertical GMPEs proposed by Kalkan and Gülkan (2004).


Ground motion prediction equations based on simulated ground motions
Gür, Kader; Askan Gündoğan, Ayşegül; Kale, Özkan; Department of Earthquake Studies (2018)
Ground Motion Prediction Equations (GMPEs) are one of the key elements in seismic hazard assessment to estimate ground motion intensity measures by basically taking into account source, path and site effects. Most of the existing predictive models are derived from databases compiled from real (or observed) ground motion data. However, in data-poor regions, a novel practice to develop new GMPEs is to use simulated or hybrid ground motion datasets for performing reliable seismic hazard analysis. Simulations o...
A Model for Vertical-to-Horizontal Response Spectral Ratios for Europe and the Middle East
Bommer, Julian J.; Akkar, Dede Sinan; Kale, Ozkan (2011-08-01)
In the framework of probabilistic seismic hazard analysis, the preferred approach for obtaining the response spectrum of the vertical component of motion is to scale the horizontal spectrum by vertical-to-horizontal (V/H) spectral ratios. In order to apply these ratios to scenario or conditional mean spectra, the V/H ratios need to be defined as a function of variables such as magnitude, distance, and site classification. A new model for the prediction of V/H ratios for peak ground acceleration and spectral...
Probabilistic seismic hazard assessment for east anatolian fault zone using planar source models
Menekşe, Akın; Gülerce, Zeynep; Department of Civil Engineering (2015)
The objective of this study is to perform probabilistic seismic hazard assessment (PSHA) using planar seismic source characterization models for East Anatolian Fault Zone (EAFZ) and to update the design ground motions to be used in the region. Development of planar seismic source models requires the definition of source geometry in terms of fault length, fault width, fault plane angles and segmentation points for each segment and associating the observed seismicity with defined fault systems. This complicat...
Development of integrated earthquake simulation system for Istanbul
Sahin, Abdurrahman; Şişman, Rafet; Askan Gündoğan, Ayşegül; Hori, Muneo (2016-07-12)
Recent advances in computing have brought a new and challenging way to tackle the earthquake hazard and disaster problems: integration of the seismic actions in the form of numerical models. For this purpose, integrated earthquake simulation (IES) has been developed in Japan, and now a new version is being developed in Turkey which targets Istanbul. This version of IES is being built in MATLAB and includes site response analysis and structural analysis of existing buildings with data obtained via GIS databa...
Probabilistic seismic hazard assessment of Eastern Marmara and evaluation of Turkish Earthquake Code requirements
Ocak, Recai Soner; Gülerce, Zeynep; Department of Civil Engineering (2011)
The primary objective of this study is to evaluate the seismic hazard in the Eastern Marmara Region using improved seismic source models and enhanced ground motion prediction models by probabilistic approach. Geometry of the fault zones (length, width, dip angle, segmentation points etc.) is determined by the help of available fault maps and traced source lines on the satellite images. State of the art rupture model proposed by USGS Working Group in 2002 is applied to the source system. Composite reoccurren...
Citation Formats
E. Akyüz, “Development of site specific vertical design spectrum for Turkey,” M.S. - Master of Science, Middle East Technical University, 2013.