土耳其地震序列的近断层脉冲型地震动识别与特征分析

丁龙兵1,2,胡进军1,2,李培旭1,2,刘名吉1,2

振动与冲击 ›› 2023, Vol. 42 ›› Issue (23) : 71-79.

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (23) : 71-79.
论文

土耳其地震序列的近断层脉冲型地震动识别与特征分析

  • 丁龙兵1,2,胡进军1,2,李培旭1,2,刘名吉1,2
作者信息 +

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

  • DING Longbing1,2,HU Jinjun1,2,LI Peixu1,2,LIU Mingji1,2
Author information +
文章历史 +

摘要

2023年2月土耳其东安纳托利亚断裂带连续发生多次6级以上强震,为揭示此次强震序列中的近断层地震动特征,选取土耳其Mw7.8、Mw7.5、Mw6.7和Mw6.3的四次地震中的781组强震记录,基于能量法识别获得45条水平向脉冲型地震动记录和17条竖向脉冲型地震动记录,其中水平向75%的脉冲型地震动来自于Mw7.8地震。通过分析识别的速度脉冲记录表明,存在相同台站竖向为脉冲型地震动而水平向为非脉冲型地震动的现象;土耳其地震序列的速度脉冲具有周期短、幅值大的显著特点,其中8002台站记录的最大脉冲周期达到7.57 s、3138台站记录的最大脉冲幅值达到231.30 cm/s。通过分析矩震级对脉冲周期的影响和脉冲幅值随矩震级和断层距的变化规律表明,水平向速度脉冲周期随矩震级呈对数线性增大,在相同矩震级情况下脉冲周期明显小于已有模型的预测值;脉冲幅值随断层距的增加存在明显衰减的趋势,当断层距小于25 km时,脉冲幅值普遍高于已有预测模型。研究结果表明土耳其地震序列产生了大量的近断层脉冲型地震动,识别结果丰富了全球近断层脉冲型地震动数据库,揭示的特征可为震害分析和脉冲模型建立提供参考。

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.

关键词

土耳其地震序列 / 脉冲型地震动 / 脉冲识别 / 脉冲周期 / 脉冲幅值

Key words

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

引用本文

导出引用
丁龙兵1,2,胡进军1,2,李培旭1,2,刘名吉1,2. 土耳其地震序列的近断层脉冲型地震动识别与特征分析[J]. 振动与冲击, 2023, 42(23): 71-79
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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