zhenbo

ISSN 2096-7780 CN 10-1665/P

罗全波, 陈学良, 高孟潭, 李宗超, 李铁飞. 集集地震近断层速度脉冲分析[J]. 地震科学进展, 2019, (10): 2-11. DOI: 10.3969/j.issn.0253-4975.2019.10.002
引用本文: 罗全波, 陈学良, 高孟潭, 李宗超, 李铁飞. 集集地震近断层速度脉冲分析[J]. 地震科学进展, 2019, (10): 2-11. DOI: 10.3969/j.issn.0253-4975.2019.10.002
Quanbo Luo, Xueliang Chen, Mengtan Gao, Zongchao Li, Tiefei Li. Analysis of near-fault velocity pulses in the Chi-Chi earthquake[J]. Progress in Earthquake Sciences, 2019, (10): 2-11. DOI: 10.3969/j.issn.0253-4975.2019.10.002
Citation: Quanbo Luo, Xueliang Chen, Mengtan Gao, Zongchao Li, Tiefei Li. Analysis of near-fault velocity pulses in the Chi-Chi earthquake[J]. Progress in Earthquake Sciences, 2019, (10): 2-11. DOI: 10.3969/j.issn.0253-4975.2019.10.002

集集地震近断层速度脉冲分析

Analysis of near-fault velocity pulses in the Chi-Chi earthquake

  • 摘要: 初步分析了近断层速度脉冲的成因和特点,主要包括方向性效应、滑冲效应和上盘效应,并通过集集地震中27个近断层强震台的脉冲记录分析了断层破裂方向和滑移大小对地面运动峰值速度的影响。采用最小二乘法对速度脉冲的分布范围进行了回归分析,大于50 cm/s的速度脉冲主要聚集在断层距为10 km的近断层区域。对不同区域的三分量平均速度反应谱进行统计分析,表明近断层脉冲型地震动具有较大的特征周期和谱值,其中在垂直于断层走向的水平分量上尤为显著,这与断层剪切位错辐射效应的特征基本相符。针对脉冲型地震造成近断层地质灾害频发的现象,由共振效应分析了速度脉冲对边坡岩体的影响。近断层速度脉冲的研究可能对防震减灾、地震预警、震害评估有一定的参考意义。

     

    Abstract: This paper preliminary analyzed the causes and characteristics of the near-fault velocity pulse, including the directivity effect, fling-step effect, and hanging wall effect. The influence of fault rupture direction and slip size on the peak ground velocity was analyzed using the pulse records of 27 near-fault stations in the Chi-Chi earthquake. The distribution of velocity pulses was analyzed with least squares method. The velocity pulses larger than 50 cm/s were mainly concentrated in the near-fault region with a fault distance of 10 km. The statistical analysis of the three-component average velocity response spectrum in different regions shows that the near-fault pulse-like ground motion has a large characteristic period and spectral value, especially the horizontal component perpendicular to the fault strike. This is basically consistent with the characteristics of the radiation effect of the shear dislocation. In view of the phenomenon that near-fault geological disasters were frequently caused by the pulse-like earthquake, we analyzed the resonance effect of velocity pulse on the slope rock masses. This study of near-fault velocity pulse may provide some significant references for earthquake prevention and disaster reduction, earthquake early warning and seismic damage assessment.

     

/

返回文章
返回