A Ground-Motion Predictive Model for Iran and Turkey for Horizontal PGA, PGV, and 5% Damped Response Spectrum: Investigation of Possible Regional Effects

Kale, Ozkan
Akkar, Dede Sinan
Ansari, Anooshiravan
Hamzehloo, Hossein
We present a ground-motion prediction equation (GMPE) for Turkey and Iran to investigate the possible regional effects on ground-motion amplitudes in shallow active crustal earthquakes. The proposed GMPE is developed from a subset of the recently compiled strong-motion database of the Earthquake Model of the Middle East Region project (see Data and Resources). A total of 670 Turkish and 528 Iranian accelerograms with depths down to 35 km are used to estimate peak ground acceleration, peak ground velocity, and 5% damped elastic pseudospectral acceleration ordinates of 0: 01 s <= T <= 4 s. The moment magnitude range of the model is 4 <= M-w <= 8, and the maximum Joyner-Boore distance is R-JB = 200 km. The functional form considers three major fault mechanisms (strike slip, normal, and reverse). The nonlinear soil behavior is a function of V-S30 (average shear-wave velocity in the upper 30 m of soil profile). Our observations from empirical and estimated ground-motion trends advocate regional differences in the territories covered by Iran and Turkey that originate from the differences in Q factors, kappa, and near-surface velocity profiles. These factors eventually affect the magnitude- and distance-dependent scaling of spectral amplitudes in Iran and Turkey. In essence, the ground-motion amplitudes of these two neighboring countries would draw patterns different than the ground-motion estimates of GMPEs developed from the strong-motion databases of shallow active crustal earthquakes from multiple countries.


The influence of magnitude range on empirical ground-motion prediction
Bommer, Julian J.; Stafford, Peter J.; Alarcon, John E.; Akkar, Dede Sinan (2007-12-01)
A key issue in the assessment of seismic hazard in regions of low-to-moderate seismicity is the extent to which accelerograms obtained from small-magnitude earthquakes can be used as the basis for predicting ground motions due to the larger-magnitude events considered in seismic hazard analysis. In essence, the question is whether empirical ground-motion prediction equations can be applied outside their strict range of applicability as defined by the magnitude and distance ranges covered by the datasets fro...
An evaluation of the 2019 seismic hazard map of Turkey on the basis of spectrum intensity
Akansel, Vesile Hatun; Soysal, Berat Feyza; Kadaş, Koray; Gülkan, Hakkı Polat (null; 2019-10-11)
Seismic hazard maps show the distribution of expected earthquake shaking levels that have a specific probability of occurrence for a region, and provide input for engineers to design structures that will withstand earthquake ground shaking. The 2019 Turkish Building Earthquake Regulation relies on an updated seismic hazard map that considers new source models and more recent ground motion prediction equations. The effect of the change in seismic hazard map that will directly affect the code-based seismic de...
A theoretical study of rho(0)-photoproduction on nucleons near threshold
Babacan, H; Babacan, T; Gokalp, A; Yılmaz, Osman (2002-02-01)
We investigate the possibility that the process of p(0)-meson photoproduction on proton, gamma+p --> p+p(0), in the near threshold region E-gamma pp(0))/dt, which has been measured by SAPHIR Collaboration. We find that the suggested model provides a good description of the experimental data with new values of pNN-coupling constants in the region of the time-like p(0)-meson momentum. Our results suggest that such model can be considered as a suitable nonresonant background mechanism for the future discussio...
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...
A study on major seismological and fault-site parameters affecting near-fault directivity ground-motion demands for strike-slip faulting for their possible inclusion in seismic design codes
Akkar, Sinan; MOGHIMI, SAED; Arıcı, Yalın (2018-01-01)
We investigate the role of major seismological (magnitude, pulse period, fault length, seismic activity, orientation of incident seismic wave with respect to fault-strike) and geometrical (fault-site geometry) parameters to understand the variations in ground-motion demands due to near-fault directivity (NFD) effects. To this end, we used a suite of probabilistic strike-slip earthquake scenarios and established the elastic spectral amplitude distributions conditioned on the above investigated parameters. Th...
Citation Formats
O. Kale, D. S. Akkar, A. Ansari, and H. Hamzehloo, “A Ground-Motion Predictive Model for Iran and Turkey for Horizontal PGA, PGV, and 5% Damped Response Spectrum: Investigation of Possible Regional Effects,” BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, pp. 963–980, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/62906.