【摘要】 提出一种基于小波方法的考虑近断层多个脉冲地震动的分析方法(multiple pulse analysis,MPA),选取COSMOS地震动数据库台湾集集地震事件中断层距小于30km的83组水平向地震动的数据,阐述了MPA方法的原理与实现,并利用MPA方法识别与分析了63组属于脉冲波的地震动速度时程。结果表明,考虑多个脉冲波对分析近断层脉冲型地震动特性的必要性,并讨论了断层距对近断层脉冲震动最强方向与理论方向差值,以及显著小波个数的影响关系。更多还原

【Abstract】 A multiple pulse analysis(MPA)method is proposed to classify and characterize the near-fault earthquake characterizing multiple pulses based on wavelets method.83 sets of horizontal strong ground motions whose closest distance to fault are all kept within 30 km from Taiwan Chi-Chi earthquake are selected from the COSMOS virtual data center for analysis.The principle of MPA is depicted in details,and 63 sets of earthquake records chosen previously are classified as pulse-like ground motion by MPA method.The results indicate that the MPA method provides a better representation and classification performanle for nearfault earthquake records characterizing multiple pulses.The influences of the closest distance to fault on the difference between the strongest direction and the theoretical strongest direction as well as the number of pulse are also discussed.更多还原