Regional Kappa Models on North Anatolian Fault Zone (Turkey) and Their Use in Ground Motion Simulations

Date

2015-12-14

Author

Karim Zadeh Naghshineh, Shaghayegh
Askan Gündoğan, Ayşegül

Metadata

Show full item record

Item Usage Stats

104
views

0
downloads

One approach to model the high-frequency attenuation of spectral amplitudes of S-waves is to express the observed exponential decay in terms of Kappa factor. Kappa is a significant parameter used for identifying the high frequency attenuation behavior of ground motions as well as one of the key parameters for stochastic strong ground motion simulation method. Recently, it has been also used in adjusting ground motion predictions from one region to another. Currently, other than a previous study by the authors, there are no detailed studies on kappa using Turkish strong ground motion datasets. In this study, with the objective of deriving regional kappa models, we examine ground motion datasets from different regions in Turkey with varying source properties, site classes and epicentral distances. Statistical tools are used to investigate the dependency of kappa on these parameters. In addition, potential correlations between kappa and Vs30 values of the stations are also studied. Main findings of this study are regional kappa models on North Anatolian Fault zone. Finally, we also present high-frequency strong motion simulations of past events in the selected regions using the proposed kappa models. Regardless of the magnitude, source-to-site distance and local site conditions at the stations, the high-frequency spectral decay is simulated effectively.

Subject Keywords

Computational Geophysics, Numerical solutions, Computational seismology, Seismology

URI

https://agu.confex.com/agu/fm15/webprogram/Paper79308.html
https://hdl.handle.net/11511/77551

Conference Name

2015 American Geophysical Union Annual Fall Meeting

Collections

Department of Civil Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

A regional near-surface high frequency spectral attenuation (kappa) model for northwestern Turkey Askan Gündoğan, Ayşegül; Pekcan, Onur (2014-10-01) One approach to model the high-frequency attenuation of spectral amplitudes of S-waves is to express the observed exponential decay in terms of Kappa (kappa) factor [1]. Kappa is a significant parameter used for identifying the high-frequency attenuation behavior of ground motions as well as one of the key parameters for stochastic strong ground motion simulation method. As of now, there is not a systematic investigation of the Kappa parameter based on the recently-compiled Turkish ground motions. In this s...
A Regional High-frequency Attenuation (Kappa) Model for Northwestern Turkey Şişman, Fatma Nurten; Pekcan, Onur; Askan Gündoğan, Ayşegül (null; 2012-04-17) The high-frequency attenuation of spectral amplitudes of S-waves is modeled as an exponential decay in terms of Kappa factor (Anderson and Hough, 1984). It is thus an important parameter of soils identifying the high-frequency attenuation behavior of ground motion as well as one of the key parameters for stochastic strong ground motion simulation method. In particular, for regions with sparse seismic networks, it is crucial to use simulated ground motions which require well-defined regional seismic paramete...
POD-ROM for the Darcy-Brinkman equations with double-diffusive convection Eroglu, Fatma G.; Kaya Merdan, Songül; Rebholz, Leo G. (Walter de Gruyter GmbH, 2019-09-01) This paper extends proper orthogonal decomposition reduced order modeling to flows governed by double diffusive convection, which models flow driven by two potentials with different rates of diffusion. We propose a reduced model based on proper orthogonal decomposition, present a stability and convergence analyses for it, and give results for numerical tests on a benchmark problem which show it is an effective approach to model reduction in this setting.
An analysis of a linearly extrapolated BDF2 subgrid artificial viscosity method for incompressible flows Demir, Medine (Elsevier BV, 2020-10-01) This report extends the mathematical support of a subgrid artificial viscosity (SAV) method to simulate the incompressible Navier-Stokes equations to better performing a linearly extrapolated BDF2 (BDF2LE) time discretization. The method considers the viscous term as a combination of the vorticity and the grad-div stabilization term. SAV method introduces global stabilization by adding a term, then anti-diffuses through the extra mixed variables. We present a detailed analysis of conservation laws, includin...
FINITE-ELEMENT METHOD FOR SOLVING MHD FLOW IN A RECTANGULAR DUCT Tezer, Münevver (Wiley, 1989-02-01) A finite element method is given to obtain the solution in terms of velocity and induced magnetic field for the steady MHD (magnetohydrodynamic) flow through a rectangular pipe having arbitrarily conducting walls. Linear and then quadratic approximations have been taken for both velocity and magnetic field for comparison and it is found that with the quadratic approximation it is possible to increase the conductivity and Hartmann number M (M ≤ 100). A special solution procedure has been used for the resulti...

Citation Formats

S. Karim Zadeh Naghshineh and A. Askan Gündoğan, “Regional Kappa Models on North Anatolian Fault Zone (Turkey) and Their Use in Ground Motion Simulations,” presented at the 2015 American Geophysical Union Annual Fall Meeting, 2015, Accessed: 00, 2021. [Online]. Available: https://agu.confex.com/agu/fm15/webprogram/Paper79308.html.