2021年9月16日四川泸县MS6.0地震强地面运动特征分析

李萍萍 江鹏 李同林 马康熙 温瑞智 苏金蓉 姜维松

李萍萍,江鹏,李同林,马康熙,温瑞智,苏金蓉,姜维松. 2022. 2021年9月16日四川泸县MS6.0地震强地面运动特征分析. 地震学报,44(2):260−270 doi: 10.11939/jass.20210160
引用本文: 李萍萍,江鹏,李同林,马康熙,温瑞智,苏金蓉,姜维松. 2022. 2021年9月16日四川泸县MS6.0地震强地面运动特征分析. 地震学报,44(2):260−270 doi: 10.11939/jass.20210160
Li P P,Jiang P,Li T L,Ma K X,Wen R Z,Su J R,Jiang W S. 2022. The strong ground motion characteristics of MS6.0 Luxian,Sichuan,earthquake on 16 September 2021. Acta Seismologica Sinica,44(2):260−270 doi: 10.11939/jass.20210160
Citation: Li P P,Jiang P,Li T L,Ma K X,Wen R Z,Su J R,Jiang W S. 2022. The strong ground motion characteristics of MS6.0 Luxian,Sichuan,earthquake on 16 September 2021. Acta Seismologica Sinica44(2):260−270 doi: 10.11939/jass.20210160

2021年9月16日四川泸县MS6.0地震强地面运动特征分析

doi: 10.11939/jass.20210160
基金项目: 地震科技星火计划(XH19038Y)和国家重点研发计划课题(2018YFC1504003)联合资助
详细信息
    作者简介:

    李萍萍,硕士,助理工程师,主要从事强震动观测和地震预警及地震烈度速报相关研究,e-mail:lipingping@scdzj.gov.cn

    通讯作者:

    江鹏,硕士,高级工程师,主要从事地震工程和地震烈度速报研究,e-mail:jiangpeng@scdzj.gov.cn

  • 中图分类号: P315.63

The strong ground motion characteristics of MS6.0 Luxian,Sichuan,earthquake on 16 September 2021

  • 摘要: 2021年9月16日4时33分在四川省泸州市泸县发生MS6.0地震,震中附近的强震动观测台网获取了1 320组三分向加速度记录,对有效记录进行常规处理后计算出地震动相关参数,并利用克里金插值方法得到峰值加速度PGA、峰值速度PGV和拟加速度反应谱的空间分布图。结果显示,极震区与中远场的长轴方向有较大差异,地震动表现出沿断裂走向衰减较慢的特性。通过与常用衰减关系预测值进行对比,分析了PGA和多个周期的拟加速度反应谱随距离的衰减特性,结果显示此次地震的PGA相比衰减关系预测值偏小,拟加速度反应谱相比各经验预测值呈现周期越大衰减变慢的特点,体现出川东南地区特有的衰减规律。最后分析了本次地震获得的最大加速度记录,进一步验证了局部地形和场地对地震动有显著影响。

     

  • 图  1  获取泸县MS6.0地震记录的台站分布图

    Figure  1.  Distribution of the strong-motion stations from which the Luxian MS6.0 earthquake records were received

    图  2  泸县MS6.0地震调查烈度和震中50 km范围内台站仪器烈度分布图

    Figure  2.  Investigation intensity for Luxian MS6.0 earthquake and instrument intensity distribution of the stations within 50 km away from the epicenter

    图  3  泸县MS6.0地震地震动参数空间分布图

    图(a)和(b)分别为合成PGA和PGV,图(c)为仪器烈度,图(d)−(f)分别为周期0.3,1,3 s时的拟加速度反应谱

    Figure  3.  Spatial distribution maps of ground motion parameters of Luxian MS6.0 earthquake

    Figs. (a) and (b) are synthetic PGA and synthetic PGV respectively,and Fig. (c) is instrument intensity,and Figs. (d)−(f) are pseudo-acceleration response spectrum with periods of 0.3,1 and 3 s respectively

    图  4  三类台站实测PGA值随震中距的衰减分布

    Figure  4.  Attenuation distribution of the measured PGA values with epicentral distance for the three types of stations

    图  5  各周期T 5%阻尼比拟加速度反应谱PSA随震中距的分布

    Figure  5.  Distribution of 5% damping ratio pseudo-acceleration response spectrum with epicentral distance in each period T

    图  6  SC.K2803台站的加速度a时程(a)和5%阻尼比拟加速度反应谱PSA (b)

    Figure  6.  Acceleration time history (a) and 5%-damped pseudo-acceleration response spectrum (b) at the station SC.K2803

    图  7  SC.K2803台站的局部地形(a)和观测室墙体裂缝(b)

    Figure  7.  Local topography at the station SC.K2803 (a) and the wall crack of the house (b)

    表  1  地震动记录及相关参数表

    Table  1.   Seismic records and related parameters

    台站代码震中距/km峰值加速度/(cm·s−2峰值速度/(cm·s−1仪器烈度
    EWNSUDEWNSUD
    SC.K2803 6.7 563.57 756.02 393.09 17.58 32.17 8.15 8.3
    SC.C2202 13.3 145.56 151.14 93.59 6.13 5.45 4.47 6.3
    SC.51DST 19.3 76.15 83.49 30.81 3.89 3.80 2.85 6.1
    SC.K2802 20.1 47.05 52.00 23.50 2.49 2.00 1.69 5.4
    SC.LCSN 20.6 38.27 37.57 22.11 2.00 1.52 1.43 5.2
    SC.FSTS 20.7 34.60 40.51 20.54 2.54 2.01 1.86 5.3
    SC.C2206 23.9 76.46 61.61 81.65 5.19 2.62 4.27 6.2
    SC.E0401 26.5 47.41 27.06 46.66 2.43 2.90 1.66 5.5
    SC.LXXT 29.1 38.70 43.53 16.93 1.31 1.02 1.54 5.0
    SC.C2203 31.3 33.59 17.64 53.42 1.68 1.43 2.31 5.4
    SC.K2801 31.4 26.49 30.28 37.74 1.65 1.68 1.56 5.0
    SC.E0202 31.8 20.65 10.24 17.10 1.30 1.62 0.79 4.3
    SC.C2201 32.1 47.07 23.70 33.92 2.67 2.17 1.75 5.4
    SC.E2101 33.5 21.22 22.97 25.98 1.46 1.95 1.24 4.8
    CQ.J0001 34.2 19.70 13.13 21.15 0.92 0.76 1.34 4.3
    SC.Q2304 36.7 16.17 19.36 11.29 1.15 1.05 1.71 4.6
    SC.E0201 37.1 24.68 9.54 24.73 1.00 1.28 1.72 4.6
    SC.CF001 38.3 29.77 28.16 14.38 1.39 1.31 1.29 4.8
    SC.DANF 38.4 12.93 14.83 10.47 0.92 1.06 0.99 4.3
    SC.C2204 39.9 15.59 15.24 15.49 1.02 1.22 1.47 4.3
    SC.C0401 44.9 11.78 17.17 8.94 0.64 1.13 0.72 4.2
    SC.C1102 45.5 14.45 8.30 23.81 0.72 0.77 1.39 4.5
    SC.EN001 46.8 21.75 15.30 7.03 0.80 0.78 1.28 4.4
    SC.E0302 49.4 8.35 6.43 9.79 0.66 0.66 0.85 3.5
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出版历程
  • 收稿日期:  2021-10-18
  • 修回日期:  2022-02-15
  • 网络出版日期:  2022-03-10
  • 刊出日期:  2022-04-24

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