陕西及邻区瑞雷波相速度层析成像

惠少兴 吴建平 颜文华 范莉苹

惠少兴, 吴建平, 颜文华, 范莉苹. 2019: 陕西及邻区瑞雷波相速度层析成像. 地震学报, 41(2): 181-193. doi: 10.11939/jass.20180081
引用本文: 惠少兴, 吴建平, 颜文华, 范莉苹. 2019: 陕西及邻区瑞雷波相速度层析成像. 地震学报, 41(2): 181-193. doi: 10.11939/jass.20180081
Hui Shaoxing, Wu Jianping, Yan Wenhua, Fan Liping. 2019: Rayleigh wave phase velocity tomography in Shaanxi and its adjacent regions. Acta Seismologica Sinica, 41(2): 181-193. doi: 10.11939/jass.20180081
Citation: Hui Shaoxing, Wu Jianping, Yan Wenhua, Fan Liping. 2019: Rayleigh wave phase velocity tomography in Shaanxi and its adjacent regions. Acta Seismologica Sinica, 41(2): 181-193. doi: 10.11939/jass.20180081

陕西及邻区瑞雷波相速度层析成像

doi: 10.11939/jass.20180081
基金项目: 地震科技星火计划(XH19041Y)和陕西省地震局启航与创新基金(QC201805,QC201710)联合资助
详细信息
    通讯作者:

    惠少兴,e-mail:huisx2011@163.com

  • 中图分类号: P315.2

Rayleigh wave phase velocity tomography in Shaanxi and its adjacent regions

  • 摘要: 本文利用布设于陕西及其邻区的喜马拉雅二期流动地震台阵和区内的固定地震台网共计257个台站于2014—2015年记录到的连续波形资料,采用基于图像分析的相速度提取方法,得到了7 185条瑞雷波相速度频散曲线,反演获得了周期为5—40 s的瑞雷波相速度分布图像,其最小分辨率约为20 km。结果表明:各周期瑞雷波相速度图像具有明显的横向不均匀性,能够较好地反映出地壳及上地幔顶部的地质构造特征。周期为5—10 s的瑞雷波相速度分布与地表地质构造密切相关,且高低速异常的分界线与地块边界高度吻合;周期为15 s的瑞雷波相速度分布图像显示出,大部分断陷沉积盆地(渭河、天水等盆地)表现为低速异常,表明此区域的沉积层厚度较大;周期为20—40 s的相速度分布则受地壳厚度影响较大,青藏高原东北缘始终呈现出明显的低速异常,鄂尔多斯地块中、下地壳以高速异常为主,但周期为20—30 s的相速度低速异常区分布于青藏高原沿六盘山逆冲褶皱带并一直延伸至鄂尔多斯内部,由此推测该区域地下介质中存在一定程度的物质交换和融合。

     

  • 图  1  陕西及邻区构造背景及台站分布

    Figure  1.  Tectonic settings and distribution of seismic stations in Shaanxi and its adjacent regions

    图  2  62300号台站与其它台站间的波形互相关

    Figure  2.  The cross-correlation waveforms between the station No. 62300 and other ones

    图  3  面波频散曲线提取示例

    (a) 不同周期的SNR值;(b) 经验格林函数及加入时间窗后的波形;(c) 相速度频散曲线测量图

    Figure  3.  An example for extracting Rayleigh wave frequency dispersion curve

    (a) The SNR values at different periods;(b) Empirical Green’s function and the waveform after adding time window;(c) Extraction of phase velocity frequency dispersion curve

    图  4  各周期反演所用射线数目

    Figure  4.  The number of rays for inversion at different periods

    图  6  陕西及邻区各周期瑞雷波相速度分布

    Figure  6.  Phase velocity maps of Rayleigh wave at different periods in Shaanxi and its adjacent regions

    (a) T=5 s;(b) T=10 s;(c) T=15 s;(d) T=20 s;(e) T=30 s;(f) T=40 s

    图  5  不同周期T时基阶瑞雷波相速度对S波速度的敏感核

    Figure  5.  Sensitivity kernels of fundamental Rayleigh wave phase velocity to shear wave velocity structure at different periods T

    图  7  各周期瑞雷面波相速度反演的横向分辨率分布

    Figure  7.  Horizontal resolution maps of Rayleigh wave phase velocity tomography at different periods

    (a) T=5 s;(b) T=10 s;(c) T=15 s;(d) T=20 s;(e) T=30 s;(f) T=40 s

    图  8  不同区域不同周期的相速度对比

    Figure  8.  Comparison of phase velocity of different periods in different regions

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  • 收稿日期:  2018-06-13
  • 修回日期:  2018-12-21
  • 网络出版日期:  2019-03-18
  • 刊出日期:  2019-03-01

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