徐龙军,吕淼,张恒,于越,谢礼立. 2023. 1999年台湾集集MW7.6地震跨断层场地相对运动. 地震学报,45(0):1−16. doi: 10.11939/jass.20220170
引用本文: 徐龙军,吕淼,张恒,于越,谢礼立. 2023. 1999年台湾集集MW7.6地震跨断层场地相对运动. 地震学报,45(0):1−16. doi: 10.11939/jass.20220170
Xu L J,Lü M,Zhang H,Yu Y,Xie L L. 2023. Relative motions for cross-fault sites of the 1999 MW7.6 Taiwan Chi-Chi earthquake. Acta Seismologica Sinica45(0):1−16. doi: 10.11939/jass.20220170
Citation: Xu L J,Lü M,Zhang H,Yu Y,Xie L L. 2023. Relative motions for cross-fault sites of the 1999 MW7.6 Taiwan Chi-Chi earthquake. Acta Seismologica Sinica45(0):1−16. doi: 10.11939/jass.20220170

1999年台湾集集MW7.6地震跨断层场地相对运动

Relative motions for cross-fault sites of the 1999 MW7.6 Taiwan Chi-Chi earthquake

  • 摘要: 为了获得断层地震动准确的残余位移信息,提出了一种变步长网格搜索地震动基线校正处理方法。基于1999年我国台湾MW7.6集集地震强震运动数据,探讨了断层附近地震动的位移特征,又通过地震动时程初始时刻的校正,获得了集集地震多组上、下盘台站之间的相对运动时程数据,分析了分别靠近断层的上、下盘场地之间相对运动的位移时程特征。结果显示,地震动的滑冲效应显著,断层的平均滑冲速度可高达1.4 m/s;断层盘间的相对运动类似于断层地震动的运动特征,且幅值更大;断层的残余位移约是盘间最大相对位移的80%.

     

    Abstract: Based on the strong motion data of the 1999 MW7.6 Chi-Chi (Jiji) earthquake in Taiwan region, the relative motion time histories of sites across the fault are studied. In order to obtain accurate residual displacement of near-field ground motion, a base-line correction method using variable step-size grid search is proposed. Through the correction of the initial time of the ground motion history, relative motion histories between the hanging-wall and footwall stations of the Chi-Chi earthquake are obtained. The results show that the fling-step effect of the ground motion is significant, the average slip velocity of the fault plan can be as high as 1.4 m/s; the relative motion between the fault plans is similar to the motion characteristics of the fault ground motions, while the amplitudes are even larger; the residual displacements of the fault are about 80% of the maximum inter-plan relative displacement.

     

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