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    基于多模态分离的面波谱分析方法

    张大洲 顾汉明 熊章强 肖金红

    张大洲, 顾汉明, 熊章强, 肖金红, 2009. 基于多模态分离的面波谱分析方法. 地球科学, 34(6): 1012-1018.
    引用本文: 张大洲, 顾汉明, 熊章强, 肖金红, 2009. 基于多模态分离的面波谱分析方法. 地球科学, 34(6): 1012-1018.
    ZHANG Da-zhou, GU Han-ming, XIONG Zhang-qiang, XIAO Jin-hong, 2009. Spectrum Analysis of Surface Wave Method Based on Multi-Mode Separation. Earth Science, 34(6): 1012-1018.
    Citation: ZHANG Da-zhou, GU Han-ming, XIONG Zhang-qiang, XIAO Jin-hong, 2009. Spectrum Analysis of Surface Wave Method Based on Multi-Mode Separation. Earth Science, 34(6): 1012-1018.

    基于多模态分离的面波谱分析方法

    基金项目: 

    国家重点基础研究发展计划(973计划) “南海深水区复杂地质结构地震采集基础理论研究 2009CB219403

    详细信息
      作者简介:

      张大洲(1979—)‚男‚博士研究生‚主要从事面波勘探及地震偏移成像研究.E-mail:dazhou2005@163.com

    • 中图分类号: P631

    Spectrum Analysis of Surface Wave Method Based on Multi-Mode Separation

    • 摘要: 面波频谱分析法(SASW) 作为一种横向分辨率较高的瑞雷面波勘探方法, 由于计算得到的基阶面波频散曲线存在较大误差以及无法获得高阶模式频散曲线而在应用中受到限制.通过应用Fourier变换方法(FT法) 分离提取面波各模态数据, 进而对分离后的各模态数据利用SASW法计算频散曲线.通过模型实例分析得出: (1) 利用SASW计算基阶面波频散曲线时必须分离得到基阶面波数据, 然后计算才能得到正确的结果; (2) 基于多模态分离的SASW法可以计算得到面波高阶模式的频散曲线.

       

    • 图  1  2层介质模型合成地震记录(垂直分量)

      Fig.  1.  Synthetic data (vertical-component) due to a two layer model

      图  2  合成地震记录的频率-波数谱

      Fig.  2.  Frequency wave-number spectrum of synthetic data

      图  3  3种方法计算得到的频散曲线对比

      Fig.  3.  Comparison of three kind of dispersion curve

      图  4  FT法提取得到的面波记录及与理论值对比的频散曲线

      a.基阶面波记录; b.基阶面波频散曲线; c.一阶高模式面波记录; d.一阶高模式面波频散曲线; e.二阶高模式面波记录; f.二阶高模式面波频散曲线

      Fig.  4.  Record and dispersion curve of surface wave extracted by FT method

      图  5  SASW法计算得到频散曲线与理论值对比

      a.原始面波数据频散曲线; b.基阶面波频散曲线; c.一阶高模式频散曲线; d.二阶高模式面波频散曲线

      Fig.  5.  Comparison of dispersion curve of surface wave between SASW and analytical results

      图  6  SASW法计算基阶和高模式面波频散曲线与理论值对比

      Fig.  6.  Comparison of dispersion curve of fundamental and higher mode surface wave between SASW and analytical results

      图  7  倾斜界面模型(a)及其垂直分量合成地震记录(b)

      Fig.  7.  Slant interface model (a) and synthetic data of its vertical-component (b)

      图  8  相移法计算得到的频散曲线(a)和面波分离后SASW法计算得到的相速度速度剖面(b)

      Fig.  8.  Dispersion curve calculated by phase shift method (a) and Phase velocity profile of calculated by SASW method using separated data (b)

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    出版历程
    • 收稿日期:  2008-11-20
    • 刊出日期:  2009-11-25

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