利用经验格林函数谱比法估计2013年芦山地震序列的应力降

范业昊 王宏伟 温瑞智 任叶飞

范业昊,王宏伟,温瑞智,任叶飞. 2023. 利用经验格林函数谱比法估计2013年芦山地震序列的应力降. 地震学报,45(1):98−106 doi: 10.11939/jass.20210155
引用本文: 范业昊,王宏伟,温瑞智,任叶飞. 2023. 利用经验格林函数谱比法估计2013年芦山地震序列的应力降. 地震学报,45(1):98−106 doi: 10.11939/jass.20210155
Fan Y H,Wang H W,Wen R Z,Ren Y F. 2023. Estimating stress drop of the 2013 Lushan earthquake sequence based on the empirical Green’s function spectral ratio method. Acta Seismologica Sinica,45(1):98−106 doi: 10.11939/jass.20210155
Citation: Fan Y H,Wang H W,Wen R Z,Ren Y F. 2023. Estimating stress drop of the 2013 Lushan earthquake sequence based on the empirical Green’s function spectral ratio method. Acta Seismologica Sinica45(1):98−106 doi: 10.11939/jass.20210155

利用经验格林函数谱比法估计2013年芦山地震序列的应力降

doi: 10.11939/jass.20210155
基金项目: 黑龙江省自然科学基金项目(LH2020E021)、国家重点研发计划项目(2019YFE0115700)和中国地震局地震工程与工程振动实验室重点专项(2021EEEVL0202)共同资助
详细信息
    作者简介:

    范业昊,在读硕士研究生,主要从事地震震源参数反演方面研究,e-mail:1501496@qq.com

    通讯作者:

    温瑞智,博士,研究员,主要从事工程地震与强震动观测等方面研究,e-mail:ruizhi@iem.ac.cn

  • 中图分类号: P315.3

Estimating stress drop of the 2013 Lushan earthquake sequence based on the empirical Green’s function spectral ratio method

  • 摘要: 本文以芦山地震余震为例,分析了基于强震动观测记录的经验格林函数(EGF)谱比法估计地震的拐角频率和应力降的可行性。首先给出能够可靠估计地震拐角频率和应力降的经验格林函数谱比曲线的质量标准;然后利用其估算出17次ML3.8—5.4芦山强余震的拐角频率;最后,参考其它研究给出的地震矩震级,计算出地震应力降。结果显示,芦山强余震的拐角频率主要介于1.0—2.0 Hz之间,应力降平均值为9.98 MPa,且地震应力降表现出明显的震级相关性。

     

  • 图  1  目标地震及其经验格林函数地震分布

    图中数字编号为筛选后的目标地震编号(按发震时间排序)

    Figure  1.  Distribution of target earthquakes and its EGF earthquakes

    The numbers in the figure mean the selected target earthquakes’ number (sorted by occuring time)

    图  2  EGF谱比法计算目标地震拐角频率算例

    (a) 目标地震及其EGF地震和触发台站位置分布;(b) 水平向傅氏谱;(c) EGF谱比曲线拟合;(d) M01/M0jƒcjƒc1可能值的变化;(e) Var随ƒc1可能值(颜色与图(c)对应)的变化;(f) 基于多个EGF谱比曲线的目标地震拐角频率估计值

    Figure  2.  An example of estimating target earthquake 's corner frequency by spectral ratio method

    (a) Target earthquakes ,EGF earthquakes and trigger stations location distribution ; (b) Horizontal fourier spectrum ;(c) EGF spectral ratio curve fitting;(d) M01/M0jfcj vary with the possible value of fc1;(e) Var varies with the possible value of fc1 ,color corresponding to figure (c);(f) Estimated value of target earthquake’s corner frequency based on multiple EGF spectral ratio curves

    图  3  矩震级与应力降关系

    Figure  3.  Relationship between moment magnitude and stress drop

    表  1  目标地震的震源参数

    Table  1.   Source parameters of target earthquakes

    地震序号发震时间ML震中位置EGF地震个数记录数ƒc1/HzMWΔσ/MPa
    年-月-日时:分:秒北纬/°东经/°
    12013-04-2008:06:384.830.18102.8816221.56
    22013-04-2008:31:344.130.39103.01231.91
    52013-04-2009:02:574.630.28102.93991.284.67*4.41
    62013-04-2009:11:514.330.25102.839141.674.76*13.35
    72013-04-2009:20:094.630.17102.99332.484.59*24.31
    82013-04-2009:26:004.430.19102.95341.664.211.96
    92013-04-2009:37:284.930.28102.9918201.874.78*20.09
    102013-04-2009:39:344.530.13102.84551.444.54*4.00
    142013-04-2011:34:175.330.24102.94231141.165.15*17.21
    162013-04-2111:59:374.930.26103.00781.344.85*9.41
    172013-04-2112:39:183.830.22102.89221.643.95*0.77
    182013-04-2117:05:225.430.34103.0015911.145.09*13.28
    192013-04-2117:30:244.230.28102.9814152.214.27*5.70
    212013-04-2122:16:544.330.33102.9320281.914.32*4.37
    222013-04-2305:54:494.530.35103.00661.674.32*2.92
    232013-04-2322:07:153.830.29102.96445.143.76*12.31
    242013-05-0102:14:134.130.25102.89993.24.24*15.59
    注:标*数据来自易桂喜等(2016),标†数据来自温瑞智等(2015)。
    下载: 导出CSV

    表  2  部分EGF地震的拐角频率

    Table  2.   Corner frequency of partial EGF earthquakes

    发震时间ML震中位置记录数ƒcj/Hz
    年-月-日时:分:秒北纬/°东经/°
    2013-04-2022:10:323.130.28102.3946.78
    2013-04-2913:45:403.030.26102.8832.79
    2013-04-2501:20:153.230.29102.8853.58
    2013-04-2514:11:223.030.28102.92126.51
    2013-04-2219:04:523.130.21102.9632.42
    2013-04-2421:36:353.130.26102.90123.91
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-10-08
  • 修回日期:  2022-01-16
  • 网络出版日期:  2022-12-29
  • 刊出日期:  2023-01-17

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