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前驱波还是气压波?

杨小林 杨锦玲 危自根

杨小林, 杨锦玲, 危自根. 前驱波还是气压波?—与“汶川MS8.0地震前山西前兆低频前驱波特征分析”作者商榷[J]. 地震科学进展, 2021, (11): 522-527. doi: 10.3969/j.issn.2096-7780.2021.11.006
引用本文: 杨小林, 杨锦玲, 危自根. 前驱波还是气压波?—与“汶川MS8.0地震前山西前兆低频前驱波特征分析”作者商榷[J]. 地震科学进展, 2021, (11): 522-527. doi: 10.3969/j.issn.2096-7780.2021.11.006
Yang Xiaolin, Yang Jinling, Wei Zigen. Precursory or atmospheric waves?-Comments on“Analysis of characteristics of precursor wave of low frequent in Shanxi before Wenchuan MS8.0 earthquake” by Zhang et al (2009)[J]. Progress in Earthquake Sciences, 2021, (11): 522-527. doi: 10.3969/j.issn.2096-7780.2021.11.006
Citation: Yang Xiaolin, Yang Jinling, Wei Zigen. Precursory or atmospheric waves?-Comments on“Analysis of characteristics of precursor wave of low frequent in Shanxi before Wenchuan MS8.0 earthquake” by Zhang et al (2009)[J]. Progress in Earthquake Sciences, 2021, (11): 522-527. doi: 10.3969/j.issn.2096-7780.2021.11.006

前驱波还是气压波?—与“汶川MS8.0地震前山西前兆低频前驱波特征分析”作者商榷

doi: 10.3969/j.issn.2096-7780.2021.11.006
基金项目: 自然资源部深地动力学重点实验室开发研究课题(J1901-16)和中国科学院战略先导B类专项(XDB41000000)联合资助。
详细信息
    通讯作者:

    杨小林(1983-),男,高级工程师,主要从事地球物理信号分析工作。E-mail:yang-xiaolin123@163.com

  • 中图分类号: P315.72

Precursory or atmospheric waves?Comments on“Analysis of characteristics of precursor wave of low frequent in Shanxi before Wenchuan MS8.0 earthquake” by Zhang et al (2009)

  • 摘要: 2008年5月11日山西地区5个地壳形变测项出现了“前驱波”信号,但其真实的物理本质究竟如何?至今仍存质疑。为此,本文借助小波变换方法对气压波和“前驱波”在不同时、频段的相关性进行了较系统的诊断;还进一步将“前驱波”与短时气压波动所产生的干扰实例进行了对比分析。结果表明:这些“前驱波”并非源自汶川MS8.0地震,而主要是气压波动的干扰。

     

  • 图  1  汶川MS8.0地震前山西地区观测到“前驱波”的台站分布 (a) 及具体测项 (分钟值);(b) 侯马台;(c) 太原台; (d) 代县台;(e) 静乐井;(f) 朔州井

    Figure  1.  (a) Spatial distributions of the five stations (black triangles) in Shanxi Province in which the “precursory waves”(marked with red dashed rectangles) observed; Minute value curves of NS component of strain at Houma (b), Taiyuan (c), Daixian (d) starions; Minute value curves of water level in Jingle (e), and Shuozhou (f)wells. The 2008 Wenchuan MS8.0 earthquake is marked with dashed red vertical line

    图  2  洞体应变NS分量与短时气压波动的对比曲线 (分钟值)。(a) 太原台;(b) 代县台

    Figure  2.  Comparisons of the NS component of strain (black lines) with the short-period oscillation of barometric pressure (red lines) data with one-minute sampling rate recorded at Taiyuan (a) and Daixian (b)stations,respectively

    图  3  洞体应变NS分量和气压的小波分析结果,绿色垂直虚线界定了“前驱波”出现的时段[15]

    d1—d6依次为小波分解后第1—6层的细节部分,其信号对应的周期分别为2—4 min,4—8 min,8—16 min,16—32 min,32—64 min,64—128 min

    Figure  3.  Decomposition of the signals of the NS component of strain (black lines) and barometric pressure (red lines) for Taiyuan (a) and Daixian (b) stations into six levels (d1 to d6) using wavelet transform. The starting time and ending time of the precursory waves are marked with dashed green vertical lines[15]

    The corresponding periods of decomposed signals (from d1 to d6) are 2—4 min,4—8 min,8—16 min,16—32 min, 32—64 min,and 64—128 min,respectively

    图  4  太原 (a,b) 和代县台 (c,d) 洞体应变NS分量对短时气压波动的响应实例 (蓝色虚线框所标)

    Figure  4.  Evidence of atmospheric pressure-induced strain changes (marked by the dashed blue rectangle) for Taiyuan (a,b) and Daixian (c,d) stations ,respectively

    表  1  小波分解所提取的“前驱波”信号特征[15]及其与气压波的相关系数

    Table  1.   The characteristics of “precursory waves” extracted by wavelet transform[15],and its correlation coefficients with atmospheric waves

    测项“前驱波”出现
    的层数[15]
    “前驱波”出现的时段
    (5月11日)[15]
    信号周期/min“前驱波”与同时段
    气压波的相关系数
    太原台
    洞体应变NS分量
    301:01—20:208—160.05
    400:31—20:3016—320.68
    500:20—21:4732—640.89
    615:34—21:1664—1280.84
    代县台
    洞体应变NS分量
    413:27—19:4916—320.30
    512:31—20:5932—640.43
    613:50—20:4564—1280.49
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-19
  • 修回日期:  2021-10-01
  • 网络出版日期:  2021-12-08

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