An empirical attenuation relationship for Northwestern Turkey ground motion using a random effects approach |
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| Authors: | Cem
zbey Ali Sari Lance Manuel Mustafa Erdik Yasin Fahjan |
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| Institution: | a Department of Civil Engineering, University of Texas at Austin, Austin, TX 78712, USA;b Kandilli Observatory and Earthquake Research Institute, Bo
aziçi University, Istanbul 81220, Turkey |
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| Abstract: | Using a random effects model that takes into consideration the correlation of data recorded by a single seismic event, a database consisting of 195 recordings from 17 recent events is employed to develop empirical attenuation relationships for the geometric mean of horizontal peak ground acceleration and 5-percent damped spectral acceleration (Sa). The recordings employed are obtained from strong motion stations operating in Northwestern Turkey and resulted from events that include the Kocaeli (Mw=7.4) and the Düzce (Mw=7.1) earthquakes and their aftershocks as well as other events. By studying differences in standard errors, the random effects model is compared with a fixed effects model that does not account for distinctions between intra- and inter-event variability. Effects of local site conditions are included in the empirical relationships developed. The dependence on frequency of the various model parameters is also studied. Frequency-dependent attenuation coefficients for the proposed random effects models developed are summarized in tables to facilitate their use. |
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| Keywords: | Attenuation Northwestern Turkey Random effects Ground motion |
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