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    利用爆炸震源资料获得三分量旋转地震动

    赖晓玲 孙译

    赖晓玲, 孙译, 2017. 利用爆炸震源资料获得三分量旋转地震动. 地球科学, 42(4): 645-651. doi: 10.3799/dqkx.2017.052
    引用本文: 赖晓玲, 孙译, 2017. 利用爆炸震源资料获得三分量旋转地震动. 地球科学, 42(4): 645-651. doi: 10.3799/dqkx.2017.052
    Lai Xiaoling, Sun Yi, 2017. Three Component Rotational Ground Motion Obtained from Explosive Source Data. Earth Science, 42(4): 645-651. doi: 10.3799/dqkx.2017.052
    Citation: Lai Xiaoling, Sun Yi, 2017. Three Component Rotational Ground Motion Obtained from Explosive Source Data. Earth Science, 42(4): 645-651. doi: 10.3799/dqkx.2017.052

    利用爆炸震源资料获得三分量旋转地震动

    doi: 10.3799/dqkx.2017.052
    基金项目: 

    国家自然科学基金项目 41074069

    国家自然科学基金项目 41374099

    详细信息
      作者简介:

      赖晓玲 (1957-),女,研究员,主要从事综合地球物理研究.ORCID:0000-0001-9129-4224.E-mail: lxling04@163.com

    • 中图分类号: P315.8

    Three Component Rotational Ground Motion Obtained from Explosive Source Data

    • 摘要: 三分量旋转地震动是目前地球物理研究重点之一.利用爆炸震源的平动地震仪观测资料,通过间接计算获得三分量旋转地震动.利用了3炮500 kg炸药的观测资料,3个爆炸点到观测台阵的距离分别是1.8、2.8和8.9 km,计算得到了台阵相对于这3个爆炸点的旋转地震动,其最大峰值旋转角速度分别是41.65、21.98和0.29 μrads/s,与国际同行的旋转地震动结果量级接近.地震动峰值随震中距的衰减是地震工程中关注的问题.提取出三分量的旋转角速度峰值,利用指数函数对三分量的峰值进行拟合,初步得到三分量的旋转地震动角速度峰值随震中距的衰减关系.衰减曲线的主要特征是,1~3 km旋转角速度能量迅速衰减,大于5 km以后衰减逐渐减慢,随着震中距增大曲线的变化越来越趋于平缓.

       

    • 图  1  物体运动的6个自由度

      Fig.  1.  Motions with six degrees of freedom

      图  2  炮点和地震台阵分布

      Fig.  2.  Position sketch of shot points and arrays

      图  3  SP2炮点的平动地震记录和计算出的z分量地面旋转角速度

      a.平动地震记录;b.旋转角速度

      Fig.  3.  Seismic records and z-axis rotational velocities obtained from SP2

      图  4  SP2炮点的平动地震记录和计算出的x分量地面旋转角速度

      a.平动地震记录;b.旋转角速度

      Fig.  4.  Seismic records and x-axis rotational velocities obtained from SP2

      图  5  SP2炮点的平动地震记录和计算出的y分量地面旋转角速度

      a.平动地震记录;b.旋转角速度

      Fig.  5.  Seismic records and y-axis rotational velocities obtained from SP2

      图  6  利用SP1炮的平动地震记录计算出的三分量地面旋转角速度

      Fig.  6.  Three component ground rotational velocities calculated by the seismic records from SP1

      图  7  利用SP3炮的平动地震记录计算出的三分量地面旋转角速度

      Fig.  7.  Three component ground rotational velocities calculated by the seismic records from SP3

      图  8  三分量旋转地震动峰值随震中距的衰减拟合曲线

      Fig.  8.  Fitting attenuation curve of three component peak ground rotational velocities with the epicentral distance

      图  9  三分量峰值平动速度随震中距的衰减关系拟合系数

      Fig.  9.  Fitting attenuation coefficient of three component peak ground translational velocities with the epicentral distance

      表  1  三分量峰值旋转角速度

      Table  1.   Three component peak ground rotational velocities

      炮点编号RxRyRz震中距 (km)
      SP230.25841.65132.1951.8
      SP113.54721.98321.0102.8
      SP30.1800.2930.2068.9
      注:PGRV单位为μrad/s.
      下载: 导出CSV

      表  2  三分量峰值旋转角速度随震中距的衰减关系拟合系数

      Table  2.   Three component fitting attenuation coefficient of peak ground rotational velocities three component with the epicentral distance

      拟合系数RxRyRz
      A128.300 0131.400 073.540 0
      B-0.802 8-0.638 5-0.454 9
      下载: 导出CSV

      表  3  三分量峰值平动速度随震中距的衰减关系拟合系数

      Table  3.   Fitting attenuation coefficient of three component peak ground translational velocities with the epicentral distance

      拟合系数TxTyTz
      A5.009 03.102 03.038 0
      B-0.669 8-0.480 3-0.563 8
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2016-11-03
    • 刊出日期:  2017-04-15

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