Assessment of Seismic Demands caused by 12 November 2017 Ezgeleh Earthquake (Mw=7.3) in Kermanshah

Document Type : Research Article


1 Ministry of Roads &Urban Development, Kermanshah,Iran

2 Department of Civil Engineering, Razi University, Kermanshah, Iran


A severe earthquake ground motion with a moment magnitude of Mw=7.3 took place in the western part of Iran on 12 November 2017. The main objective of this study is to evaluate the seismic demands of structures under the recent November 12, 2017, Ezgeleh (Mw=7.3) earthquake. For this purpose, we selected the ground motions recorded at Sarpol-e-Zahab, Goorsefid, Kerend, and Javanrood stations that have maximum PGA. Evaluation is conducted by generalized inter-story drift spectra, input energy spectra and ductility demands (μ) computed for selected records. Also, the time evolution of  the frequency-intensity content of selected records is discussed based on the Wavelet Transform (WT). Results showed that the (E-W) components trigger larger inter-story drift demands than those from the (N-S) components. Particularly, it was identified that Sarpol-e Zahab and Goorsefid stations produced inter-story drift demands significantly larger than those at other recording stations. Time-frequency analysis of ground-motions recorded at the Sarpol-e Zahab station shows that there is a transition of energy content of E-W component with lower periods (i.e. 0.25 sec) to moderate periods (i.e.0.50,0.75 sec ) that it has a potential for moving resonance in buildings with short periods between (0.2-0.5 sec). Also, it can be observed that most energies of the N-S component were highly concentrated at a long period band (between 0.9 and 1.5 sec) that is considered as pulse-like. These findings are consistent with the damage observed in Sarpol-e-Zahab and its villages, where many dwellings and buildings collapsed or suffered severe damage during this event have a low fundamental period between )0.2 and 0.5 sec).


Main Subjects

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