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Time-frequency analysis of the 2017 Sarpol-e Zahab earthquake ground motions

Publish Year: 1396
Type: Conference paper
Language: English
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SECM02_040

Index date: 21 September 2018

Time-frequency analysis of the 2017 Sarpol-e Zahab earthquake ground motions abstract

A severe earthquake ground motion with moment magnitude Mw=7.3 took place in the western part of Iran on 12th November 2017. The aim of this proposed study is to assess the time evolution of the frequency-intensity content of Sarpol-e Zahab earthquake ground motions records by using of the Wavelet Transform (WT) methodology. For this purpose, the ground motions recorded at Sarpol-e-Zahab, Kerend and javanrod stations that has maximum PGA has been selected. Time–frequency analysis of ground-motions recorded at the Sarpol-e Zahab station shows that the most energy content of the T component is concentrated at time equal to 21 s but is distributed over a range of periods between (0.2 -0.5sec) with a lesser peak in energy at a period of about 0.6 sec, that there may be effect of moving resonance on building with periods between (0.2-0.5 sec). Also, it can be observed that most energy of the L component was highly concentrated at time equal to 21 s and a narrow period band (between 0.2 and 0.3 sec) that is considered as pulse like. This finding is consistent with damage observation in Sarpol-e-Zahab and it’s around villages where many dwellings and buildings which collapsed or suffered severe damage during this event had low fundamental period between (0.2-0.5sec).

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Time-frequency analysis of the 2017 Sarpol-e Zahab earthquake ground motions authors

Bakhtiyar Ghanbari

Postgraduate student of Civil Engineering, Khajeh Nasir Toosi University of Technology, Tehran, Iran

A.H Akhaveissy

Associate Professor, Dept. of Civil Engineering, Razi University, Kermanshah, Iran