| 近断层地震动最强速度脉冲方向分量特性研究 |
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| 引用本文： | 赵晓芬,温增平,陈波.近断层地震动最强速度脉冲方向分量特性研究[J].地震学报,2018,40(5):673-688. |
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| 作者姓名： | 赵晓芬 温增平 陈波 |
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| 作者单位： | 中国北京 100081 中国地震局地球物理研究所 |
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| 基金项目： | 国家自然科学基金（51378477，51508527）、中国地震局地球物理研究所基本业务费（DQJB15B05）和中国地震局地球物理研究所基本科研业务团队创新项目（DQJB17T04）共同资助 |
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| 摘 要： | 为了研究速度脉冲型地震动的最强速度脉冲方向分量与垂直或平行断层方向分量之间的特性差异，本文采用多分量速度脉冲识别方法从NGA-West2强震动数据库的236组近断层地震动速度脉冲记录中提取出最强速度脉冲方向分量，对其脉冲参数随震级MW和断层距R变化的统计关系式进行了回归分析，并对比了最强速度脉冲方向分量与垂直或平行断层方向分量之间的特性差异。研究结果表明:当R＜30 km时，最强速度脉冲方向分量的脉冲幅值预测值较垂直或平行断层方向分量的预测值大，而当R＞30 km时，两种分量的脉冲幅值预测值相差不大，可以忽略；当MW≤7.5时，最强速度脉冲方向分量的脉冲周期预测值比垂直或平行断层方向分量的预测值大，而当MW＞7.5时，两种分量的脉冲周期预测值差异不大，可以忽略。
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| 关 键 词： | 速度脉冲 最强方向分量 脉冲参数 震级 断层距 特性差异 |
| 收稿时间： | 2017-11-26 |
Characteristics of near-fault velocity pulses in the strongest pulse orientation |
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| Affiliation: | Institute of Geophysics，China Earthquake Administration，Beijing 100081，China |
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| Abstract: | In order to explore the characteristic difference of velocity pulse between the strongest velocity pulse component and those of the vertical fault or parallel fault component, the strongest pulse orientation components were extracted from 236 groups of near-fault ground motion velocity pulse records of the strong ground motion database NGA-West2 by using the multi-components velocity pulse identification method. Then, relationships of the pulse amplitude and the period with magnitude and fault distance were also analyzed by regression. Finally, characteristics of pulses in the strongest pulse orientation and in vertical or parallel fault orientation were compared. The following conclusions can be made: When the fault distance is less than 30 km, the predicted value of the peak ground velocity in the strongest pulse orientation is larger than that in the vertical or parallel fault orientation. However, with the increase of the fault distance, the difference of the peak velocities in the two orientations can be neglected. The pulse period is smaller in the strongest pulse orientation than in the vertical or parallel fault orientation for records with magnitude MW smaller than 7.5, whereas when magnitude MW is greater than 7.5, the difference of the pulse period between the two orientations can be ignored. |
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