An empirical attenuation relationship for Northwestern Turkey ground motion using a random effects approach

✍ Scribed by Cem Özbey; Ali Sari; Lance Manuel; Mustafa Erdik; Yasin Fahjan

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 428 KB
• Volume: 24
• Category: Article
• ISSN: 0267-7261
• DOI: 10.1016/j.soildyn.2003.10.005

✦ Synopsis

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 ðS a Þ: The recordings employed are obtained from strong motion stations operating in Northwestern Turkey and resulted from events that include the Kocaeli ðM w ¼ 7:4Þ and the Du ¨zce ðM w ¼ 7:1Þ 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.