Identification and characterization of pulse-like ground motion in the Turkey earthquake sequence

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (23) : 71-79.

DING Longbing1,2,HU Jinjun1,2,LI Peixu1,2,LIU Mingji1,2

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Abstract

Multiple strong earthquakes of magnitude greater than 6 occurred in February 2023 in the East Anatolian Fault Zone, Turkey. To reveal the characteristics of near-fault ground motion in the 2023 Turkey earthquake sequence, 781 strong earthquake records from Mw7.8, Mw7.5, Mw6.7 and Mw6.3 earthquakes in Turkey were selected. 45 horizontal and 17 vertical pulse-like ground motion records were obtained based on the energy method. 75% of the horizontal pulse-like ground motion records were obtained from the Mw7.8 earthquake. Through the analysis of the velocity pulse records, the station record which can be identified as pulse-like in the vertical component may not be identified as pulse-like in the horizontal component. The velocity pulses of Turkey earthquake sequence have the characteristics of short period and large amplitude, the maximum pulse period is 7.57 s recorded from station 8002 and the maximum pulse amplitude is 231.30 cm/s recorded from station 3138. Through analyzing the effect of moment magnitude on pulse period and the variation of pulse amplitude with moment magnitude and rupture distance, the horizontal velocity pulse period increases logarithmically linearly with moment magnitude, and the pulse period is obviously smaller than the predicted value of the previous models under the same moment magnitude. The amplitude of the pulse decreases obviously with the increase of the rupture distance. When the rupture distance is less than 25 km, the amplitude of the pulse is generally greater than the previous models. The results show that a large number of near-fault pulse ground motion is occurred in Turkey earthquake sequence. The pulse-like identification results enrich the global near-fault pulse-like ground motion database, and the characteristics revealed provide a reference for engineering damage analysis and pulse model establishment.

Key words

Turkey earthquake sequence / Pulse-like ground motion / Pulse identification； Pulse period / Pulse amplitude

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DING Longbing1,2,HU Jinjun1,2,LI Peixu1,2,LIU Mingji1,2. Identification and characterization of pulse-like ground motion in the Turkey earthquake sequence[J]. Journal of Vibration and Shock, 2023, 42(23): 71-79

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