• ISSN 2097-1893
  • CN 10-1855/P

2020年10月22日四川北川MS4.7地震强震动特征分析

江鹏 李萍萍 李同林 温瑞智

引用本文: 江鹏,李萍萍,李同林,温瑞智. 2021. 2020年10月22日四川北川MS4.7地震强震动特征分析. 地球与行星物理论评,52(2):227-233
Jiang P, Li P P, Li T L, Wen R Z. 2021. Strong-motion recordings in MS4.7 Beichuan, Sichuan earthquake on October 22, 2020. Reviews of Geophysics and Planetary Physics, 52(2): 227-233

2020年10月22日四川北川MS4.7地震强震动特征分析

doi: 10.19975/j.dqyxx.2020-025
基金项目: 地震科技星火计划资助项目(XH19038Y)
详细信息
    作者简介:

    江鹏(1987-),男,工程师,主要从事强震动观测和工程地震研究. E-mail:jiangpeng@scdzj.gov.cn

  • 中图分类号: P315

Strong-motion recordings in MS4.7 Beichuan, Sichuan earthquake on October 22, 2020

Funds: Supported by the Science for Earthquake Resilience (Grant No.XH19038Y)
  • 摘要: 2020年10月22日11时03分37秒四川省绵阳市北川县发生MS4.7地震,四川强震动台网与预警烈度速报台网在震区建成较密集的台站,获取了532组三分量加速度记录,有助于开展区域地震动衰减和地震动特征研究. 本文对强震记录进行常规处理后计算出强震动记录的相关参数,利用克里金插值方法得到地震动峰值加速度PGA和峰值速度PGV的空间分布图,长轴呈北西—南东方向. 分析强震动记录PGA、PGV 随距离的衰减规律,与常用衰减关系预测值进行对比,此次地震 PGA 的衰减特性与俞言祥和汪素云(2006)提出的中国西部地区水平向基岩加速度衰减关系有较好的一致性. 北川MS4.7地震获得的密集强震动记录为建立区域衰减关系,以及开展基于经验格林函数方法(EGFM)再现大震强地震动场展布等研究提供了重要的数据支撑.

     

  • 图  1  北川MS4.7地震中获取记录的强震动台站分布图

    Figure  1.  Strong-motion stations recorded the Beichuan MS4.7 earthquake

    图  2  强震动记录数量与震中距统计图

    Figure  2.  Statistical chart of the number of strong motion records and epicenter distance

    图  3  51BCB台站和51BCQ台站加速度时程与5% 阻尼比拟加速度反应谱

    Figure  3.  Acceleration time histories and 5%-damped pseudospectral accelerations for the recorded at stations 51BCB and 51BCQ

    图  4  PGA和PGV空间分布图

    Figure  4.  Contours for PGA and PGV

    图  5  PGA和PGV随震中距衰减分布

    Figure  5.  PGAs and PGVs attenuated with epicentral distance

    表  1  地震动记录及相关参数表

    Table  1.   Seismic records and related parameters

    台站代码 纬度/(°)经度/(°)震中距/km峰值加速度/(cm·s−2峰值速度/(cm·s−1仪器烈度
    EWNSUDEWNSUD
    51BCB31.8104.2 2.9−277.53−250.72103.513.544.120.987.1
    B260331.9104.110.9158.11180.88142.52−3.85−4.281.666.7
    B057131.7104.312.5156.39152.2784.132.81−2.27−1.766.2
    U230231.8104.018.8−84.8958.35−113.25−1.050.46−1.515.7
    B260732.0104.221.530.6223.7421.001.111.110.684.7
    B050231.7104.424.823.8610.0619.62−1.620.490.674.5
    B260432.0104.026.540.2636.04−35.32−0.87−0.950.724.8
    51BCQ31.8104.526.711.817.346.590.360.220.193.1
    B260831.9104.527.371.0546.5920.26−1.730.89−0.425.5
    51BCY31.7104.429.164.2837.23−18.701.07−0.69−0.275.0
    U231031.8103.930.339.08−52.45−30.540.51−1.070.274.8
    F830331.6104.130.3−53.0957.1327.28−1.221.46−0.625.1
    B050131.6104.331.444.66−17.6243.600.50−0.40−0.514.4
    B260631.8104.636.4−59.36−35.0316.99−2.36−0.96−0.375.4
    B050331.6104.438.1−25.13−9.91−37.91−0.790.54−1.324.9
    B260131.9104.639.428.32−23.969.10−2.010.760.364.8
    B260232.0104.539.815.6713.63−12.76−0.14−0.16−0.173.0
    F830131.5104.241.1−15.99−15.52−6.070.53−0.550.293.7
    U230131.8103.742.121.8730.39−29.72−0.190.40−0.103.9
    B811231.7104.642.8−19.51−13.82−5.240.950.59−0.304.1
    B271332.2104.546.316.5317.998.34−0.23−0.320.143.4
    U230631.9103.746.624.6634.7835.83−0.30−0.370.173.9
    B270332.1104.547.646.7348.69−28.52−0.19−0.420.134.3
    51MZX31.4104.248.06.60−4.60−3.28−0.45−0.30−0.153.0
    B810631.7104.749.5−6.3211.61−2.670.480.28−0.133.2
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出版历程
  • 收稿日期:  2020-11-16
  • 录用日期:  2020-11-30
  • 网络出版日期:  2021-09-13
  • 刊出日期:  2021-03-01

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